CP4 High Pressure Fuel Pump Failure
CLICK HERE to purchase our LML CP4 High Pressure Fuel Pump Failure Kit
The 2011-2016 Duramax suffers from a high pressure fuel pump issue unique to this year range. Failure of this CP4 pump is usually catastrophic, causing instant contamination of the entire fuel system with metal particulates. Chances are, if you’re looking at this page, you’re well aware of the problem. Below we will discuss the reasons for this failure, how to diagnose a pump failure, and show you the parts you need to properly fix your vehicle.
Why Does it Fail?
The short answer: lack of lubricity. Lubricity is most commonly defined as the ability of a fluid to minimize the degree of friction between surfaces in relative motion under load conditions.
The CP4 injection pump creates higher pressures with less volume than its predecessor, the CP3 pump. Although this makes it a more efficient pump, the lack of volume creates a lack of lubrication since these pumps rely on the diesel fuel to act as a lubricant. In addition to the higher pressure and lower volume, the removal of sulfur from modern diesel fuel (Diesel #2 or Ultra-Low Sulfur Diesel) also destroys compounds that exist in the fuel naturally that would normally contribute to increased lubricity. Some fuel resellers mix lubricity-increasing additives into their fuel prior to sale, but this is not consistent and not well-regulated. Using a commercially available diesel fuel additive can be helpful, but cannot be guaranteed to prevent CP4 pump failure.
Diagnosing a Pump Failure
The LML and LGH CP4 pumps most commonly fail due to this lack of lubrication which causes internal metal parts (the drive cam, cam follower or pump piston, as well as the housing itself) to rub against each other and begin to shave off small metal particles. These particles are immediately distributed throughout the fuel system causing catastrophic failure. Some pumps actually seize up completely and burst the aluminum housing open as a result of this failure.
Using lubricity additives doesn’t guarantee that your pump won’t fail someday, so it’s important to know what steps to take when it happens to you.
If you’re experiencing a hard start or no start, or are getting the following trouble codes; P0087, P0088, P0191, or P128E, a pump failure could be the problem.
Remove the CP4 pump and then the fuel pressure regulator for inspection. If the body casing of the pump is cracked, as in the picture, or you find metallic debris on the fuel pressure regulator screen (pictured right) this is indicative of a pump failure.
Repairing Your Vehicle
GM Mandates that the below steps be performed:
• Replace: Pump, rails, injectors, all high pressure fuel lines, return lines, and fuel filter
• Clean and flush: All fuel chassis lines, filter pipes, and other engine mounted fuel system pipes (low pressure)
• Remove and clean/flush: Fuel tank and fuel sender
InjectorsDirect.com has put together complete repair solution for LML/LGH CP4 Pump failure using all OEM parts (pictured below.) Simply flushing the fuel system is inadequate, and could lead to residual contaminants in your fuel system. Contamination is the number one cause of repeat injector failure, and replacing all of the fuel system components is the only way to prevent recurring contamination issues.
We offer this kit in a few different convenient configurations to meet your needs, by default it includes:
- Bosch OEM New or Remanufactured LML Injectors (8)
- BOSCH® OEM New CP4 Pump (Updated housing, camshaft, roller tappets and gear pump)
- Bosch OEM New Fuel Rails (2)
- Bosch OEM New Return Line Assembly
- GM OEM New High Pressure Fuel Lines (Pump to rail, rail to rail & rails to injectors)
Click here for more information and to purchase the kit for your 2011-2016 Duramax LML Truck.
Click here for more information and to purchase the kit for your 2011-2016 Duramax LGH Truck or Van.
Give us a call or click today and get back on the road!
Could you please email me a copy of this LGHCP4 pump failure tech bulletin. Had to do a $10,000 replacement of fuel system on my 2014 gmc 3500 due to metal shavings. Trying to negotiate warranty with General Motors. Thank you for your assistance.
Good morning – We will send over a copy of the tech bulletin text right away. Thanks for stopping by!
Hey Brother, just bought a 2015 Chevy Silverado 2500. Only has 55000 miles on it. Would you please send me the tech bulletin? Do you think a formal recall will come about?
Thank you,
Robert
Hello Robert,
We have sent the bulletin your way. Unfortunately, we have not heard of any formal recall coming into effect. Thanks for stopping by!
I have a 2011 GMC Sierra 2500HD diesel LML. Read article in TrailerLife. Had no idea this was a problem. Have 82,00km on truck. Do you think GMC would cover this as a preventative measure, keeping good will of customer? Would you please send me the Technical Bulletin. Thank you very much. Now I am apprehensive about worthiness of my truck.
Thanks Again.
Derm Strong, in Canada
We will send that right over, Derm. We think it’s worth inquiring with GMC about preventative replacement if you’re under warranty, but we also sell just the pump for only $854.00 as a low cost alternative. https://www.injectorsdirect.com/product/duramax-lml-lgh-cp4-injector-pump/
I have a 2016 Duramax with 108,000 miles and the fuel pump had completely failed. Can someone send me the bulletin?
Hi Mark,
Sorry to hear about your truck. We will send a copy of the bulletin your way. If there is anything we can do to assist you with your truck please give us a call at 1-800-500-0980.
Please send me a copy of the SB for the Duramax CP4 failure. I have a 2015 that has not failed but I’m concerned it will fail at anytime. What suggestions do you have to be proactive to prevent the failure?
Hi Gary,
While we don’t have a service bulletin, I’d be happy to send over a copy of the blog post for you. Replacing the pump with the Cp4.2 or a CP3 conversion, running additive for increased lubricity, and using a FASS lift pump to increase the quality of the fuel being delivered and provide extra filtration are all recommended.
Hello looks like I’m having this problem I’ve been replacing everything and it won’t start. I’m actually on the road. As soon as I get home I’m gonna pull the regulator and pump and check it. If you can send me any kind of info I really appreciate it I know this is an old post thank you so much
Hi Jose – We have emailed you a copy of the article. Please let us know if you have any questions or need help with some replacement parts. Give us a call at 800-500-0980 if you have any questions!
Forgot to tell you I have the 2016 LML 6.6 thanks again
Hello – wondering if this is still active 2+ years later but it looks like I may have the same issue – 2012 2500hd . Any chance you would send a copy of the bulletin my way? Thanks in advance – Raymond
Hi Raymond – I have sent over a copy of the article for you. Please let me know if we can help you with anything else!
Can you send me the LGHCP4 bulletin, we have a 2106 Chevrolet 3500 that has hd the CP4 failure.
Hi Donna- No problem, we’ll send a copy of this article over now. Please let us know if we can be of any further assistance.
Hello,
My 2016 GMC 2500 6.6 with 43,000 miles is sitting at the dealership waiting on fuel system parts. Please send me bulletins or any other info you have about fuel system failure.
Thank you
Hello Tom, thank you for reaching out to us. I just emailed you over the requested tech bulletin. Please let me know if you need and further assistance. Greg B.
Hello, will you please send me a copy of that tech bulletin? Thank you!
Will do! Please let us know if you need anything else.
Jim, can you please send me a copy of the bulletin as well? My truck just died this morning and I fear I have the same problem.
Thanks, Leo
Hi Leo- Jim is out of the office today, but I’ve emailed you a copy of the article. Please feel free to give us a call if you have any questions or if we can help you with the parts to get your truck back on the road.
My 2011 GMC 6.6 has similar symptoms. Could you please send me a copy of the bulletin? Thanks
Will do Ken!
Please send me a copy of the tech Bulletin.
Thanks!
Hi Jeff- No problem, we sent a copy of the article to your email. Please let us know if you have any questions or if we can help you get your truck back on the road.
Jim, I think we may have the same problem as well. could you please send over any information on possible recalls.
Hi Aaron- Unfortunately we don’t have any additional information available regarding recalls, however we have sent a copy of the article to your email for reference. Please let us know if we can be of any further assistance.
needing a copy of the bulletin as well. . i have a 2016 silverado Duramax 2500 , with injector pump out. has been at Sunrise GMX dealership going on 2 months and they wont even return a damn phone call. still under warranty. please send asap. Isnt’ Morgan & Morgan have a class action suit against GM now ?
I’ll send over a copy of the post for you right away!
Could you send me a bulletin please
Hi Ryan- Sure, we sent it over via email. Please let us know if we can help!
Hey sir my name is Eric McCalphia. can you send me a copy of the tech bulletin. i just spent $11,475.10 because of catastrophic feul pump failure on my 2015 Duramax Deizel
Hi Eric,
We have emailed you a copy of the article. Please feel free to reach out to us if you need any help with replacement parts. Thanks!
Good morning, we are in the process of a full fuel system overhaul because of this issue. Please send me the technical bulletin as well.
Hi Tamara,
We have emailed you a copy of the article. Please feel free to reach out to us if you need any help with replacement parts. Thanks!
Hi can you send me a copy of the tech bulletin. My fuel pump failed on 2016 GMC.
Hello Gary, I will send a copy of that bulletin to your email. Thanks, Greg
do you still have a copy of the GM Technical bulletin for the injector pump issue described here.
Hi Bill- We Don’t have a GM bulletin to distribute, however we are happy to share a copy of our article as we have done for many other customers. We’ll email it to you right away, please let us know if you have any questions or if we can help with parts for your truck.
Please send me the bullitin concerning the fuel pressure pump failure. I bought a new 2015 High Country Duramax and just experienced the fuel pump failure. Dealer is still repairing the problem and I want all the information so I can at least fight a little!!!! Estimate for repair is 10 K.
Hello Pearl,
I am sorry to hear this, We sent a copy your way.
Hello
Would you be able to send me a copy of that tech bulletin for the CP4 injection pump. my 2015 3500 just went into the dealership for a repair.
Thank you
Justin
Hi Justin- Just sent it over, please let us know if we can help you with any parts to get your truck fixed.
Just curious if I could get a copy of the technical bulletin about the pump failure for the Chevy truck from 2011 to 2016? I have a friend that owns one of those trucks and I’d like to give it to her! ?
I’ll send a copy of it over for you.
Could you please send a copy of the bulletin to me as well?
Hi Josh, I am more than happy to do that for you! Let us know if you need anything else!
Better yet there has been several class action suites filed. Contact Morgan and Morgan
I would be interested to learn about the class action suit. What is it called and contact info.
Also the Tech bulletin on this as the dealer just quoted me 10k on my LML with 84K on the odo
We’ll send over a copy of the blog post right away for you. I’m afraid we don’t have any details on any pending legal action. Let us know if you have any other questions!
Can you please send me a copy too! Our truck just died on us this morning.
Thank you
Michelle
Hi Michelle- I’ve emailed a copy of the article, please let us know if we can help you out with the parts necessary for your repair. Thanks!
Could you email me a copy of the bulletin.
Thanks!
Hi John- We emailed a copy of the article over, please let us know if we can be of any further assistance!
Hello, Michael.
Could you please send me a copy of the bulletin? I have a 2015 Chevrolet 2500HD LTZ. Love this truck! Thank you.
Hi Gus – I’ve sent that over via email for you. Please let us know if you need anything else.
I have a 2016 Chev Duramax. Just cracked 75k. I would love to have a copy of the SB to reference when I request a pre-emptive replacement.
Hi Darrell. While we don’t have a service bulletin, we can send over a copy of our blog post here so you have a copy for reference.
Hello Jim , I have a 2015 that just failed , what have they done to update the pump ? Will you also send me a copy of the bulletin , The dealer is telling me that the pump is on back order and won’t be in for at least 10 days
I’ll send that right over. We have pumps (CP4 as well as CP3 conversion kits from S&S Deisel) in stock and ready to ship today!
I have a 2014 lml with 56k throwing a P0191 code and the dealer thinks it’s the co4 initially although the truck is running fine. 6 months out of warranty! Could you send the bulletin to me?
Any one having any luck wi gm covering this as it’s so widespread?
Hi Mike – we’ve sent over a copy for you – please let us know if you need any further assistance!
I have 2012 2500 Silverado with 126k. Have had Check engine light on for months but no loss of performance. Last week I was driving on freeway and the service Def system see owners manual NOW message came up with a Def light. It started counting down to limp mode. Before it had been erratic with its Def sensor, readings from no Def to full Def and everything in between. (Tank was actually full). I turned back and brought into first shop I could get to. They pulled a slew of codes:
P0087 HISTORY
P122E
P11B5 NOX
P11DC NOX
P202E ACTIVE
P2510
P122D
P205B ACTIVE
P2610
I took to another shop closer to the only place I could find a spot for my trailer. Took into another shop for 2nd opinion. They pulled same codes, ran a regen and I picked up truck because I had to move trailer again.
Now I have returned truck and gotten their diagnosis… It’s a minimum of 5500$ to replace fuel pump, change fuel filter, and perform service. If they find metal particles in the regulator then… I won’t write the words I’m saying out loud it’s family friendly forum. They can spend 2 hours labor getting to regulator and will tell me so I can decide what to do from there depending on if they find metal or not. The truck was a military vehicle made by world class trucks, and bought used so no hope of warranty. Is there any resource for assistance in this matter anyone can think of? I don’t have resources to fix the worst case scenario (or best) and am open to selling it. Is it possible to prove that seller cleared codes and sold knowing it had problems? Thanks for any help I am a newbie, this is my first (and likely LAST) diesel. I have already paid for weeks of lodging and am far from home. Not sure they can even finish before I have to move trailer again. It’s a nightmare, any advice appreciated.
Hi Trevor thanks for getting in contact with us! I have just emailed over a copy of this bulletin for your keeping and please let us know if there’s anything else we can do!
We are dealing with this same issue it is going to cost us 10k. We had no codes no signs of any problems just stopped. Can we have a copy hopefully they will have a recall and maybe get some of are money back.
Hi Kimmie,
I’ve emailed you a copy of the post for your records – in the meantime please don’t hesitate to reach out by phone at 800-500-0980 to discuss the options we have for trucks with failed CP4 pumps. We look forward to assisting you!
Jim
Could you please forward me a copy of the tech bulletin as well? My 2016, 85,000 miles, four months out of warranty, just experienced this with a $11,000 quote for repair. I am hoping/demanding warrantee be applied.
Hi Jeff,
I can email you a copy of this blog post, but please note there is no official TB from GM on this as far as we know. I’ll send you a copy of our post over now – feel free to give us a call at 800-500-0980 to discuss the options we have for your Duramax!
Can you please provide me with a copy of the bulletin as well. Our 2914 Chev 3500 is in the shop with an $11,000 repair bill for this very thing. Thank you!
Hello Sue, Thank you for reaching out to us. I will email you over the tech bulletin. Greg B.
Hi
I your opinion can you keep a stock cp4 living?? I.E. Lift pump, additive? Will the updated cp4 pump be a better swap for longevity? 2013 duramax 40000mls
Bob
Hi Robert- Yes, we definitely recommend running a fuel additive in every tank, this will add lubricity to your fuel and help your pump & injectors last longer. If your truck has the original CP4 you might consider upgrading to the updated CP4.2 as a precaution to avoid the catastrophic failure. We have the pump available here: https://www.injectorsdirect.com/product/duramax-lml-lgh-cp4-injector-pump/ Please let us know if you have any further questions.
Our 2016 GMC 1 ton Duramax has 70K miles without any issues. Over the weekend had this high PSI pump failure your referencing go out as per GM dealership. Thankfully GM will be covering this under powertrain warranty. Tough when dealers says “at least one week for needed repairs”
When we do get truck returned, what fuel additive would you recommend for us going forward? We are full time RVers towing a 5th wheel around the country.
Thanks for the informative article you have posted.
Hello Rick, Glad the article has been helpful for you. We run Stanadyne Performance in all of our trucks and have had a lot of good luck with it.
Hi, I just experienced the problem described above. This article helped me through the whole process, thank you. My truck is a 2016 2500 Duramax 91.5k on it. The dealer quoted the repair at 13k retail. Thankfully it was covered under the power warranty. I asked the obvious question- has the CP4 pump been improved? Their answer was yes. What do you all think?
Hi Marco- We’re glad to hear our article was helpful for you! Yes, the updated CP4.2 pump has proven to be much more reliable. We sell a lot of these kits and have not seen any failures to date. Please let us know if we can be of any further assistance.
I’m interested in the cp4.2 info and price also
Hi David, we’ve sent that information over via email for you. Please let us know if there is anything else we can assist you with!
My 2011 just died on me, thinking it’s the same problem as everyone else. It’s at the dealer now getting checked out. Can I get the bulletin also?
Hi Matthew- Sorry to hear this, we’ll send a copy of the article over right away. Please let us know if we can help you out with the parts to get your truck back on the road!
Please send me an email copy of your article on the cp4 pump issues..also, what replacement parts I need to replace the pump in my 2016 duramax 2500 ..also what lubricant you recommend..
Hi Ed- I just emailed over a copy of the article. Please feel free to give us a call at 1-800-500-0980, we would be happy to help!
My CP4 just went out on my ‘16. I asked mechanic at dealship if it was the same pump and he said he thought it was an updated pump. I don’t know. I thought the 16’s had the CP4.2 already.
I have a 2019 Duramax diesel with 1700 miles on it and the pump blowed up any answers for that
Hi Jeff- Sorry to hear this! Unlike the 2011-2016 LML the 2019 Duramax uses a Denso HP4 pump. Either way, your truck should definitely be covered under warranty. Let us know if we can be of any assistance.
GM void my warranty at 2200 miles at first changing the high pressure pump under warranty they said and then changing lift pump once the truck still didn’t start they said they void warranty and recommended I replaced all the parts including the ones they just replaced via technical service bulletins please help
Hi Dennis- Sorry to hear this, please let us know if we can help you with any parts to get your truck back on the road.
I have a 2012 that just had a new regulator installed and runs irregular sometimes..sounds like i have the same problem. I use the truck to tow a 5th wheel on weekends..thought it would be worthy..ive put over 5000 into it in last 6 months…very dissatisfied with gm. And thier diesel truck…
I have a 2013 model 3500 with 75,000 on it. Its over the 5 year time frame but mine blowed up. $10,900 repair. Can I get a copy of the tech bulletin?
Hi Brad- We’ll send over a copy of the tech bulletin text right away. Thanks for stopping by!
Good evening, My 2012 (133,000)just bit the dust on a long trip this past Friday and the repair shop that I have it at is a very good tech on Duramax and he is telling me that it’s a very strong possibility it will need the entire fuel system cleaned and most fuel components replaced on the engine. Are that any bulletins out that that could help me with some help on the warranty from GM or are they leaving all of us GM owners just hanging?
Hi Dan- Unfortunately we don’t have any solid info on GM’s willingness to complete these repairs at no charge when the vehicle isn’t under warranty, it seems to be decided on a case by case basis. Please let us know if you have any further questions or if we can help you get your truck back on the road.
2013 Duramax owner. Could you send the bulletin my way as well? I want to talk to my dealer. Thank you for this great info!
Hi Steve- No problem, we’ll send it over right away. Thanks!
I have a 2016 Duramax and the cost is supposed to be $13,000. Can I get a copy of the bulletin.
Hi Frank- No problem, we’ll send you a copy.
Thanks!
My 16’s CP4 just went up. 59,000 miles all stock. But it was covered under powertrain. How many miles did yours have ?
Since it would seem the failures are at random time or milage time frames is there an investigation into poor priming practices ie.air passing thru the linear spaces causing a dry ( no lubrication;fuel) condition that can be causative to failure.
Certain industrial application run bearing surfaces at high temperatures and possible higher bearing speeds with only pure water as coolant and lubricant with out failure . For the life of the systems.
Hello Francis, We see the common reason for the failure of the original CP4 Pump is mainly due to the lack of Lubricity, it is a combination of less volume in the CP4 Pump and the removal of sulfur from modern diesel fuel. This creates a very unfortunate circumstance for the original CP4 leading to catastrophic failure in most cases.
I have a 2015 could you send the tech bulletin also. Thank you
Good morning Brian – we will send that over right away!
Hi, I have a 2015 2500 GMC Duramax with 45,000 miles with no problems so far. I am presently using a fuel additive for lubrication. Can you send me a copy of the notice?
Thanks,
Dennis Van Wye
Hi Dennis- No problem, we’ll send a copy to your email. Please let us know if you have any further questions.
Tuned n deleted 12 3500. So far so good but would like tb sent if u could. Thank u in advance..
Hi Bruce- No problem, we’ll send a copy of this article over to you right away. Please let us know if you have any further questions.
I have a 2014 2500 gmc Sierra 2500hd 6.6 can I get a copy aswell
Will send that over right away!
I have a 2015 GMC 2500 with 140k just started to throw code po191 fuel rail pressure sensor. Would you please send me the tech notes on this issue please.
Hi Jeffrey- We’ve emailed you a copy of the article per your request, please let us know if we can help with any parts to get your truck back on the road!
I have 2013 GMC 2500, 102,000 miles. No problem so far. But this concerns me a lot! Options?
Hi Byron- You might consider upgrading your pump to the updated CP4.2 as a preventative measure. Feel free to give us a call if you’d like to discuss further.
Have a 2011 GMC 6.6lml 18500 miles on it no problems yet need copy of paper work want to up grade pump before it blows up should be recall on it they Kno what’s wrong with it
Hello Paul, We have emailed a copy of the article over to you, please let us know if you have any questions.
My 2013 had 114260 when it failed last week in lake havasu city stuck on road for 1hr in 115 degree heat truck shut off so quickly I couldn’t get it off the hwy completely very dangerous dealership wants 12900 to fix am currently in negotiations with gm
Randy, my 2016GMC blew up at 111,454 miles
What , if any assistance did you get from GMC ?
I am currently waiting for an answer.
Any ! Information would be helpful and appreciated
Thanks !
I have a 2011 GMC Savana LT 3500 Passenger Van with the LGH 6.6 Duramax. I currently have just under 35,000 miles. It has not done any heavy towing so far and is completely stock. It has been mostly used for hauling the family around for vacations and certain events. I have has no issues with the fuel system to date. Would it be wise to change out just the CP4 pump before I start to notice any issues?
Hi Mike- Yes, that would be a good idea. We have the updated CP4 pump in stock, let us know if we can help.
Hi,have a 2016 2500 6.6 with 32k on it and no issues so far.
What “exactly” has been improved on the cp4.2 pump..?
Thank you
I also would like a copy of the bulletin please. Thank you
Hi Scott- No problem, it’s on the way. Please let us know if you have any further questions.
Is GM going to put out a replacement warranty like they did with injectors on the lb7’s I have a 2013 with 107,000 and a 2015 with 40,000 no problems yet
Send me a copy please
Hi Wes – not sure on what GM will do, but I’ll get a copy of the bulletin sent over for you!
I have a 2016 6.6 liter how can I tell if I have the cp4 or the updated cp4.2 on my truck ? only have about 30,000 miles on it. Do you think that GMC will put out a recall, don’t see how they could afford it. Thanks for a great article. What about using the cp3 model?
Hi Mark- Are you able to read the Bosch P/N on the pump? If so, please let us know what it says & we can confirm for you. At this point we havent’t heard anything about a recall being proposed. Many customers run a CP3 conversion however that pump is not designed to deliver 2,000 bar of fuel pressure.
My 2016 durramax fuel pump just exploded with 127,000. Have had the truck since new and all highway mile. Truck is out of warranty and looking at least 10,000 to fix. Would you please what ever ammo you have that I could use against Chevy please. Any help is appreciated
Hi Nik- We just sent it to your email, please let us know if we can be of any further assistance.
I have a 2106 GMC Sierra 2500 HD with a duramax. I have 121k miles and the high pressure pump went out. The estimated cost of repairs $11,000. My truck has been in the shop for a month. They replaced the pump, it didn’t fix the problem. GMC Technical said that pump was bad also. They have another pump on order and we are being told it will be at least another week before they get the new pump. I’m losing faith in GMC. Their Customer Support has been worthless! Any help you can provide would be appreciated
Hi Danny- Sorry to hear they haven’t been able to get your truck repaired in a timely fashion, we have complete kits and pumps in stock & ready to ship today. Please let us know if we can help!
My pump just went out on my 2015 after 129,000 miles and got a $10k bill could also get some information I could use against GM?
Hi Alan – the only information we have is what’s published here – I’ll email you over a copy so you have it handy.
Hello I have the same issue 2015 2500HD, warranty is up and I’m at 170,000km. fuel pump failure. Dealer wants $17,500 after charging me $1600 to replace fuel filter and fuel filter housing. The price is ridiculous. Took took it from the dealer because I obviously can not afford that. Please send me any information that can help me and ammo against GM for this failure.
Hi Chris,
I’d be happy to send over a copy of this post for you to print out and have handy. If you can find a mechanic that will install parts you bring, we can certainly help you out with a pump failure kit for that LML Duramax – just give us a a call!
Can you send me a copy of the tech bulletin?
Hi Nik- We just sent it to your email, please let us know if we can be of any further assistance.
Hey we have a repair shop in Miami, we have a 2014 that appears to have a bad high pressure pump can u send me the bulletin everyone is asking about and the procedure u guys use to confirm the pump is the problem! Thank u in advance 954-***-****
Williamher**********
Hello William,
The best way to confirm you have a pump failure is by investigating the fuel system for metal debris. We would recommend starting at the Fuel Pressure Regulator on the Pump itself. If any metal debris is found present it is a key sign you have a failed CP4 Pump. Once the pump has failed it is HIGHLY recommended and necessary to replace all components in the fuel system from the CP4 Pump to the Injectors. Failure to do so can lead to repeated catsurphioc fuel system failure.
We will send a copy of the bulletin your way.
If you have any other questions please let us know!
I have a 2013 GMC hd2500 and from my vin number I have the LML.. I use it mainly for towing Fifth Wheel and want to discuss this with my dealership. I will also be starting to use a fuel additive. What about replacing the fuel pump with the older CP3 as per article in “Trailer Life”.
Can you also send me a copy of bulletin. Thank you
Hi Ken- Running an additive is highly recommended & can definitely prolong the life of your fuel system components. Many customers run a CP3 conversion however that pump was not originally designed to deliver 2,000 bar of fuel pressure. We’ve emailed you a copy of this document, please let us know if you have any other questions.
My 2011 GMC 3500 just had the pump failure, $10,000.00 bill, I added a FASS pump and separator system so should never see the problem again, can I get a copy of the bulletin please, I don’t anticipate any help from GM but worth a try.
HI Gord- IF the updated CP4.2 pump was installed you shouldn’t have any further issues, we’ll go ahead and email you a copy of the bulletin just in case.
Andrew please send me the tech bulletin. I have been dealing with intermittent stalling and sputtering for over a year since owning my 2015 GMC Duramax. Plus, I found the previous owner was dealing with the same issue, which was not on the car fax report. It’s been in the shop 8-10 times the last year and three attempts to fix the issue and nothing has worked. I truly believe I am dealing with a CP4 pump that is going bad. Plus, the GM service manager agrees but GM won’t approve the repair of the pump! Do you know what year GM starting using the CP4.2? Or do you have any advice that can help with getting GM to make the needed repairs? My truck has 86,000 miles and once it hits 100K it won’t be covered anymore. GM is screwing me!
Hi Shawn- Sorry to hear you’re having issues getting your truck repaired, they symptoms you’re having may or may not be pump related. Normally if the pump itself is bad the symptoms aren’t intermittent. Your 2015 most likely came from the factory with the updated pump, have you checked the fuel pressure regulator? In the meantime I’ve emailed you a copy of the bulletin per your request.
Could you please sent me the bulletin. I have a 2013
Hello Kurt,
We have sent our bulletin your way, thank you for stopping by.
I have a 2012 GMC Denali with only 35000 miles. No problems with fuel yet, but is there anything I can do now to prevent problems in future without spending $3,000 +?
Hello Jim, The 2 best things you can do will be, First order our CP4 Updated Pump and replace it before yours goes faulty, Secondly would recommend always using a fuel additive to increase lubricity. This will give you the most bang for your buck while extending the life of your fuel system.
Hi Jim- We recommend upgrading the fuel filter, please see: https://www.injectorsdirect.com/product-category/duramax/duramax-cat-fuel-filter-adapter/ Replacing the filter regularly as well as running a fuel additive in every tank. Some customers replace the CP4 with the updated CP4.2 as a precaution prior to catastrophic failure. We have the updated Bosch pump available for $599.99 here: https://www.injectorsdirect.com/product/duramax-lml-lgh-cp4-injector-pump/ Please let us know if you have any further questions.
Why is there a core charge on a NEW pump? Sounds like that salvage yard nonsense. There is no need for a core on a new or used part. Only purpose for a core is when purchasing a rebuilt part.
Hi Zachary,
Many of our vendors require us to return cores on new injectors and pumps. Receiving the cores back also allows us to subsidize our low prices on new products. Since most customers have no use for the core we are able to offer much better prices by getting the cores back. You can read more here: https://www.injectorsdirect.com/return-diesel-injector-cores/
I own a 2014 Chevy HD2500 with 41,000 miles. No problems so far but would greatly appreciate a copy of the Bosch CP4.1 tech bulletin referenced in your article.
Hello George, Just got a copy sent your way! Glad to hear the truck is running good, if you ever need anything in the future please let us know!
could i get a copy of the bulletin please
Hi Larry, I’ll email that over for you now. Feel free to give us a call at 800-500-0980 if you have any questions. Thanks!
Could you send a copy of the technical bulletin my way?
Thanks
Hello Jim, Of course! It’s on its way to you now. Let us know if there is anything else we can assist you with.
I have a 2015 3500 sew with 65000 miles can you send me the bulletin please
Hi Shaun, we’ve sent that information over via email for you. Please let us know if there is anything else we can assist you with!
2015 3500 Sierra duramax 55,000 miles just went out today. Could you send me the bulletin please.
Hello Greg, Thanks for reaching out to us, I will get the bulletin sent your way! If there is anything you need please let us know.
I had just ordered a complete kit this morning from you. Could you also please send me a copy of the service bulletin from GM about this issue with the CP4 pump failure? I will try to contact GM to try and get some assistance???
Thanks,SK
Hi Steve- No problem, we’ll send it over. Please let us know if you have any further questions.
I have a 2012 GMC SIERRA 3500hd with a 6.6L Duramax. It cranks but won’t start thing just died on me while driving. It’s been to 2 shop including the dealer. Been 3 weeks and they are still just exchanging parts. GM tech is saying I need 4 injectors on the left side. Not trying to buy $2400.00 worth of injectors and still have the same problem. Please advise me on my next move can’t afford 10k because they are guessing.
Hi Mr. Reid- Sorry to hear this. Do you know what diagnostic steps have been completed? We have 1/2 sets of injectors for the LML starting at $649.99, alternatively you could send your injectors in to us for testing to verify weather or not that is your problem. Feel free to give us a call at 1-800-500-0980 if you’d like to discuss further, we would be happy to help!
Thanks for the info on this post I had no idea about this. I have a 2016 with 35000 miles , should I just wait just before my 5 year powertrain is up and replace to the CP4.2 it seams like a good idea.
Hi Brad- Yes, that is what most customers do. Please let us know if we can help you with anything in the meantime.
Read all the comments, scary hope Gm steps up could I have a copy of the bulletin Thanks 2011 chevy with a hauler bed 81000 so far no problem heading to alaska next year any comments on the fass or sea dog lift pump and dual filters Richard
Hi Richard- We went ahead & emailed you a copy of the bulletin. Additional filtration is always a good idea, we also recommend running a fuel additive in every tank to add lubricity.
Hi Andrew, I just read my May 2019 issue of Trailer life Magazine. The article is called Diesel Heart Transplant. S&S Diesel Motorsport does an article about how the CP4.2 injection pump has garnered the reputation for catastrophic failure.I have a 2015 with just under 40,000 miles.They tell of converting a CP4.2 fuel injection pump to a S&S Diesel Motorsport CP3.
I was checking Duramax Diesel forums but then found you guys. Have you seen this article? Also, would you send me that tech. bulletin. Thanks, Greg
Hi Greg- We just sent a copy of the bulletin over to your email. The CP3 conversion is a good option, as the CP3 platform is much less prone to catastrophic failure. We have new Bosch® CP3 pumps in stock, let us know if we can help!
Jim,
Could I please get a copy of the bulletin you have referred to.
Thank you
Hi Randy- We’ve emailed a copy of the article over to you, please let us know if you have any questions.
Can you email me a copy of the tech bulletin as well. Looking at a 2013 duramax that’s never been touched.
Hi Larry – We sent the bulletin via email as requested for you. Please let us know if you have any other questions.
My pump failed at 36,000 miles and failed again at 78,000 miles. What in the heck!!! Thankfully I have a extended warranty.
Hi Erik- Good to hear you were able to get that covered under warranty! You might want to consider running a fuel additive to add lubricity, we use Stanadyne Performance & have great luck with it.
2015 GMC 2500 with LML 6.6 Turbo diesel and 55000 miles . i too am an Rver and the article in my Trailer Life magazine got my attention. Please forward me a copy of the bulletin….thanks.
Hi Tom – we have sent the bulletin via email as requested. Please let us know if you have any other questions.
I have a 2016 LGH 1 Ton Express. Could you please email me the tech bulletin as well?
Hi Forrest, we’ve sent that over as requested. Please let us know if you have any other questions.
We have now experienced this issue on a 2015 3500HD Duramax. The powertrain warranty expired on 4/30/19. I see “Special Coverage 29400” under my warranty details online with an expiration of 4/30/2024, but nothing for this bulletin. The local Chevy dealer has offered to pay for half of the total repair costs. Is this an offer we should accept, or is the tech bulletin something I can present and get full coverage without legal action? Thank you.
Hi James – This is a technical article we’ve put together to inform customers of a common issue with the LML CP4 – not an official Service Bulletin from Chevy. That being said, we are not in a position to offer legal advice with regard to your warranty coverage with Chevy. We’re happy to answer any questions you have regarding the parts!
Understood. Thank you.
Hi guys, my 2011 hd2500 injection pump blew up. Would love to get copy of tech report. $12,000 to fix I Hope gmc will step up.
Thanks
Sending it over now, please let us know if we can help!
Can you please email me the bulletin? 2015 GMC Sierra 2500HD 6.6 Duramax, 78000 miles……..injector pump went out today! Dealer wants $12000!!! Just got off phone with GMC ‘after hours’ warranty, said it would be covered under bumper to bumper-which expired already. I think it should be covered under drivetrain?! Any info you can email me would be great! Calling GMC again tomorrow & having it towed to a different dealer!
(we also tow a 5th wheel)
Hi Glenn- We just emailed it over. Hopefully they cover that for you under the powertrain warranty. If not please let us know, we’ll be here to help.
Please send a copy of report……my 2015 duramax injector pump went today! $12,000 to repair
Hi Jason- Its on the way, please let us know if we can help.
I have a 2015 Chevy hd 2500 Duramax diesel. While i was driving down the road going about 40 mph without any warning the engine just shut of. I tried to restart the motor but all it would do was turn over with no fire. I had a mechanic friend check it out and he said it was the high pressure pump that went out. Please send me a copy of your report. Thanks
Hi Malcolm- We just sent it over, please let us know if we can help!
hey my pump blew last month can I get a copy of it? 2012 3500 out of warranty but still!
Thanks for reaching out Christy! We have sent the bulletin – let us know if you have any questions.
We have a 2016 GMC 3500 HD with 50k miles on it. No problems yet and it’s still under warranty but we would like to not have any problems on the road as this truck is use for towing. Could you please send us the bulletin and also any recommendations you would do to keep failures at bay. We have not installed a lift pump either. Thanks for your help!
We have sent the bulletin Tony – please let us know if you have any questions.
I have a 2015 2500 Duramax diesel and it was serviced at the dealer 5 days ago, Yesterday going 75 MPH and it felt like it ran out of gas on the freeway. Towed it back to the dealer, They tell me that the Fuel pump “grenaded” Quoted 11K but because it was just there they cut it down to 6K. I understand after reading this and several law suits this is an issue but could it have been the service that caused this. They replaced the fuel filter?? Can you send me the bulletin please.
We just sent the bulletin over to you – let us know if you have any questions at all!
We have a 2016 Duramax, and currently stranded in Yuma AZ, after a haul to California from Florida, got a quote for 13k from a local dealer for this issue, can I have a copy bulletin plz
Hi Aaron- Sorry to hear your truck is down & the dealer is trying to charge you a fortune, please let us know if we can help! We’ll go ahead & email you a copy of this article in the meantime.
Have a Chevy 2013 LML Duramax with 77000 miles, no problem yet, but of course concerned. Please send tech bulletin on the high pressure pump in question. Also name of recommended fuel additive . Thanks
Hi Jerry- No problem, we just sent it over. In the meantime we recommend Stanadyne Performance Formula® which can be found here: https://www.injectorsdirect.com/product/stanadyne-performance-formula-diesel-fuel-additive/
In addition to the updated CP4.2 pump we also have a drop in CP3 conversion kit available, please feel free to give us a call if you’d ‘like to discuss further.
My 2013 GMC 2500 HD Duramax with 105000 miles just ate its CP4 pump. The usual fix, $10000.00 and the dealer sent me on my way.
Can you please send me the tech bulletin.
Thanks
Hi Loren- Sorry to hear this, we just emailed you a copy of this article for your reference.
2015 Duramax is down 115,000 injector pump sensor 3 weeks ago.1200…now a turbo… $4500 on turbo, should I do inj pump now
Hi Gerald- Replacing the CP4 as a precaution would not be a bad idea & may save you thousands of dollars compared to waiting until your original pump fails & damages your entire fuel system. Please let us know if we can help.
Hello, I have a 2015 GMC injestion pump failed @ 58k miles, dealer is refusing to warranty because the truck has a tuner. does this void the powertrain warranty?
Hi Bobby- Unfortunately it’s at the dealer’s discretion. Have you tried taking the truck to another dealer for a second opinion?
I’ve taken it to two different dealers. neither will honor warranty
Sorry to hear that, please let us know if we can help you with the parts necessary to get your truck back on the road.
You took it to the dealer with a tuner on it ???
can you please send me the tech bulletin?
Hi Bobby- No problem, we’ll send a copy of this article over now. Please let us know if we can be of any further assistance.
I have a 2011 that I am having fuel issues with, could I get this bulletin for diagnosing this please? I think mine is an electrical issue but it won’t hurt to check this out. When this happens, I get all sorts of things that happen intermittently and then it operates fine…
Hi Jonathan – we’ll send over a copy of the post via email. Please let us know if you need any further assistance!
Have a 2014 Chevy with 90000 miles, pump went out today. Please send a copy of the tech bulletin,negotiating with the dealer now. Five months out of warranty. Thanks
Hi Rick – we’ll send over a copy of this article to your email as requested. Please let us know if you need anything else!
copy of technical bulletin please
Have a 2012 Duramax in the shop right currently for repairs from the CP4 failure. Will you forward the Tech Bulletin to me please? Thank You!
Hi Nicole – we’ll email over a copy of this article for you. Please let me know if you have any other questions!
We Have a 2013 GMC Denali with 96,000 miles just installed a Fass 165 gal pump & been using a injector lube & fuel treatment for a few months.. Please send the tech Bulletin. We bought an extended factory warrenty, 7 years or 100,000 miles which will soon be up. Thanks Pete
Hi Pete- It’s on the way, please let us know if you have any questions.
I have a 2015 Duramax 2500 with 50k miles. No failure yet. I am reading lots about the pending “implosion”. A couple of suggestions include a S&S Diesel bypass to prevent metal from ruining the injectors. This won’t stop failure of the CP4 itself, but make the repair much less costly. Suggested cost for this is less than $1k. A CP4 replacement is estimated at around $4k (if the injectors not ruined) vs. catastrophic failure cost of $8 – 11K.
Any comments on this?
Also – how to tell for sure if I have a CP4 or CP4.2 and is a CP3 much better than a CP4.2?
Also, can you send me the Tech Bulletin mentioned in previous posts?
Thanks!
Hi Rick- We’ve emailed over a copy of the article. S&S makes a cp4 bypass kit for the 6.7 Powerstroke, unfortunately they don’t currently have a kit for the LML. We will be carrying their CP3 conversion kit soon & also have the CP4.2 pumps available for $599.99 here: https://www.injectorsdirect.com/product/duramax-lml-lgh-cp4-injector-pump/
In the meantime you can tell which pump you have by locating the part number label, the original Bosch P/N is 0 445 010 616, the latest updated Bosch P/N is 0 445 010 817
I have a 2015 Duramax pulling a 5th wheel with 48K miles no problem yet. But afte reading the comments becoming concerned. Pls send the tech bulletin.
Hi Robert- No problem, we’ll send a copy of this article over to you via email now. Please let us know if we can be of any further assistance.
Currently having my 2014 Chevy 3500 duramax LML fuel pump repaired at $10,200. The dealership told me they are putting a CP4 pump on, is the CP4.2 compatible to switch to? Also can I have the bulletin emailed to me also? GM customer service has been nothing but rude. Also has anyone that has dealt with this gotten anywhere with GM? Truck has 180,000 miles so warranty is way up.
Hi Beth- The CP4.2 we sell is a direct replacement, and our full kit is currently on sale for $3299.99. Unfortunately there is no GM policy that we are aware of that will cover the costs associated with this issue outside of warranty. We’ll email a copy of this article over to you right away, please let us know if we can help you with the parts for your repair!
I have a 2013 2500. With 40000 miles. Trk runs good, but now I’m a little nervous. Pls send me a copy of this file. I might need to be pro active.
Thanks
Hi Charles- No problem, we’ll get a copy of this article sent over to you right away. Let us know if you have any questions!
My 2016 GMC Sierra 3500 just failed today. Can you send me a copy of the CP4 failure bulletin. Thank you very much!
Hi Steve- Sorry to hear that, we just sent a copy of this article to your email. Please let us know if we can help you with a kit to get your truck back on the road!
I have a 2012 Duramax with the LML engine have had trouble with the Def tank but so far no injector pump failure. 84,000 miles, will start using an additive. Could you email me the tech bulletin so I can look at it. I think I just may sell the truck and go to gas. I don’t tow that much.
Hi Jim- No problem, we’ll email a copy of this article over to you. Let us know if you have any questions!
Would like the tech bulletin as well please. I’m running a 2015 Denali HD with102k on it.
Sure thing Nathan – we will send that right over!
As suggested here, I am looking for the fuel pump on my 2015 Silverado HD 2500 to determine if it is a CP4 or CP4.2.
Can you tell me where the fuel pump is located?
Hi Gene- The CP4 pump is located in the valley of the engine. Please let us know if you have any further questions.
2015 GMC Duramax. 53000 miles. Runs at with no problems. Did have eGR bypass replaced under warranty. Use fuel additive. Very nervous about fuel pump. Tow fifth wheel a across country. Please send bulletin.
Chet
Hi Chet- No problem, we’ve sent a copy of the article to your email. Please let us know if you have any further questions.
Need to read that bulletin I have a crank no start problem dealership is guessing now + I don’t have a warranty to cover my repairs. Can you send it to me please
My 2012 3500 lml dually died out in me while driving about 30km/h. It chugged along for about 5 seconds before completely shutting off. Could not get it to start after that so it was towed to the dealer. Today they said they were charging me 800$ to pull the cp4 for inspection. I gave the go ahead for that but now I am expecting the worst at this point as their is no warranty on it. The truck is completely stock still and i don’t feel I should have to be responsible for the $10,000+ bill of thats the case.
Has anyone heard about them fixing the problem out of good faith. Can I please have a copy of the tech bulletin?
Hi Brett- Sorry to hear this. $800 just to check the pump seems excessive, all that needs to be done to start would be to pull the regulator to check for signs of catastrophic failure (metal shavings). If you get into it & find there was a failure please let us know, we would be happy to help you out with the parts & get your truck back on the road for much less $. In the meantime we emailed you a copy of our article.
I have a 2012 2500 lml 94000 miles no problem yet would putting in a fleece lift pump be a good alternative?
Hi Phillip- A lift pump with additional filtration can definitely help, we also recommend running a fuel additive to add lubricity. We carry Fass lift pumps & Stanadyne Performance Formula additive, please let us know if we can help you with either!
2016 3500 pump just blew. Please send bulletin. Thank you!
Hi Samantha- Sorry to hear your pump failed! We just emailed a copy of the article over, please let us know if you have any questions or if we can help you with the parts to get your truck back on the road.
Have an ’11w/ 175,000 mi and +70 hp “economy tow” Tuner. No problems yet but want to takeaction to prevent. Please send bulletin and what is the “improvement” on the 4.2, Still a CP4 right ?
Hi Phil- Yes, the updated CP4.2 is still a CP4 pump. We have a CP3 conversion kit available if you’re looking to get away from the CP4 platform. If you’re simply looking to prolong the life of your original CP4 pump we can definitely help, we recommend running a fuel additive to add lubricity and a lift pump for additional filtration. We carry Fass lift pumps & Stanadyne Performance Formula additive, please let us know if we can help you with either. We’ve also emailed you a copy of this article in the meantime.
Could you please send the bulletin my way?
Hi Josh- No problem, it’s on the way. Please let us know if we can be of any further assistance!
I have a 2015 GMC 2500 HD, currently with 62,000k miles. I also pull a 5th wheel camper. So far I have not had any such problems; however, this problem concerns me. I would greatly appreciate a chance to read the article associated with this problem.
Is the CP3 an option if and when I need to replace the CP4 or do I have to purchase the upgraded CP4.2?
Hi Daniel – the blog article above is the information we have for the LML CP4 (I’ll email you a copy). We are in the process of adding the CP3 conversion to our available options, but as of today only the CP4.2 kit is available. Stay tuned for more to come!
Jim, I have been looking into the CP3 conversion kits. I’m sorry to hear you do not have them in your inventory. what are your thoughts on converting from the CP4 to the CP3. thanks
Hi Dave- We have the S&S CP3 conversion kits available, please feel free to give us a call at 1-800-500-0980 if you’d like to discuss the options.
I have a 2016 Silverado HD Diesel with 35,700 miles, all stock. Would you forward the TSB to me?
We don’t have a TSB – this is a technical article we’ve put together ourselves. I’ll email you a copy of the blog post just in case. Please let us know if you have any other questions.
please send me info on pump for 2015 chevy duromax,also what is a typical charge to replace with new approved pump before it blows up?thanks
Hi Brett- We have the pump available for $599.99 here:
https://www.injectorsdirect.com/product/duramax-lml-lgh-cp4-injector-pump/
Please let us know if you have any further questions.
I have a 2011 3500HD 6.6 duramax LML 183000 miles I did pull the fuel reg from the pump and found metal shavings. I know its a pump failure. question, not meaning to be rude because your site as been very helpful,however, y’all are half the coast of other companies ie: Merchant Automotive. I say the coast savings are awesome. Can you help me understand why there is a coast diference? Thanks.
Hi Dave- We purchase the kit components in bulk directly from the manufacturer which get us the best pricing possible, and we pass these savings along to our customers. Please let us know if you have any further questions.
Thank you Andrew. Y’all have been a big help. We will be businesse together soon.
Could you send me the technical article?
I have a 2015 gmc sierra with 45700 miles and no problems “YET”.
Hi Bruce- No problem, we’ll send a copy over to your email right away. Please let us know if you have any further questions.
I am looking at getting at 2015 LML, do the 2015s have the updated pump? Also, could you send the bulletin over to me so I have it just in case? Thanks
Hi Kellen- The only way to tell if you have the CP4.2 pump would be to reference the Bosch part number. We’ll send a copy of this article over to you right away, please let us know if you have any further questions.
We have a 15 and 16 lml at our house. So is this a service bulletin that gm is not advertising that you are sending everyone? Anyway could I please get a look at it? Thanks
Hi Austin- Unfortunately we don’t have an official bulletin from GM. Many customers have requested a copy of our article be sent to their email, which we have done. Please let us know if you have any further questions.
I’ve got a 2014 2500HD Denali with 96,000km and broke down yesterday. From what the dealership told me so far, my high pressure pump is shot. They have not quoted on cost yet but based off others responses this is going to be a costly repair. Warranty is up but I’m hoping GM stands by their vehicles and covers this expense. Looking at these posts on here this seems to be a very common issue. That being said, I would hope that GM issues a recall to prevent these catastrophic failures of their equipment. In the mean time can u send me the bulletin please? Thank you!
Hello Jeremy, We are sorry to hear your truck broke down. We will send a copy over to your email right away. When you need to get your replacement fuel system components please let us know, we would be more than happy to assist you. Please let us know if you have any further questions.
Please send me the info as well. My 16 Denali has 39k miles and this topic always leaves me with a thought in the back of my head.
We’ll send over a copy of the post for you! Please let us know if you have any other questions.
Do you plan to do this for the ecodiesel? i cannot find anything for reroute kits or even a whole fuel system like you sell for the duramax.
Hello Chris, At this time we do not have plans for that, but we will keep it in mind. Thanks for stopping by!
Hi, I have a 2011 LML. Can you send me over a copy of the tech bulletin? Thanks
Hello Jody, We will send a copy over to your email right away. Please let us know if you have any further questions.
Can you please send me the bulletin. Took my 2015 Duramax in a week ago for engine code P0191. They said fuel rail sensor. Tech did some tests said all checked out fine. Pumped died today! Can’t wait to see what they now after the tech said everything was fine. I will post back to you on this issue. Thanks for the write up. Truck has 78520kms.
Hi Dean- We sent a copy of the article over, please let us know if we can be of any further assistance!
Running a 2016 3500, 29,000 miles. No issues yet, Please send me the technical bulletin. Thanks for all of this great information.
We’ve sent that over via email – let us know if you have any other questions!
Hello,
This exact same thing happened to my 2015 Duramax at 66,000 miles. The dealership paid for repairs under my warranty. Now at 126k miles the exact same thing happened once again. The dealer is claiming the following :
1. I inquired if this was the same issue as last time – ie pump failure and service rep said no it would have happened within the first 12 months – well I put 30k miles a year on my truck so if that was the case and a normal person puts 15k my first incident would have happened way earlier my first go around.
2. I was low on fuel ( 40 mile range on my screen) they are alleging that me being low on fuel is what more or less caused this to happen.
3. They allege they installed the new upgraded pump after the first incident – it was only after I started questioning about the issues surrounding the defects of these pumps they stated the updated pump was installed after the first failure. I still need to confirm which pump they installed the 2nd time.
Shouldn’t the dealer warranty their work they performed after the original incident ? Doesn’t seem right. Also when I was broken down I talked to my service rep on the phone – he didn’t confirm I had a diesel and was telling me to turn the key forward to prime the fuel then try and crank – after the fact he said he didn’t realize I was in a diesel- could this have caused further damage requiring more costly repairs ?
Thanks
Hello Alex,
We are really sorry to hear you are having to deal with this difficult situation yet again. It’s unlikely their troubleshooting recommendation caused further damage, but that’s impossible for us to determine at this point. Sorry again about your truck, and let us know if we can help.
We have a 2015 Silverado dually 3500. Broke down yesterday while hauling horses. First indicated fuel filter need to be changed, then went into limp mode, then complete shutdown with no power. All happened from start to finish within 30 seconds. Fuel pump is shot. Metal shards throughout. Luckily with 87000 Miles it’s covered under warranty. We should have had the updated cp4 so it’s scary that they’ll be replacing it with the exact same pump that failed.
We’re sorry to hear that, Kellie, but glad to hear it was covered. If you still have access to the failed pump, you might double check the part number to see which it was. The original part number ends “619” and the updated one we offer ends “817” – we haven’t heard of any of the updated ones failing since we’ve sold them.
The cp4.2 only lasted me q year and a half , I am now going with the cp3 conversion, it ain’t happening again this was second time
Hi Justin- We Carey the S&S CP3 conversion kits, please let us know if we can help.
Could you please send me a copy of this technical bulletin? I have a customer complaining of a long start time on his 2015 Duramax and this sounds exactly like the culprit. Thanks
Hello Campbell,
Thank you for stopping by, We will send you over a copy right now. If you need anything else please let us know, We would be more than happy to assist you.
Could I also get that bull item? And thank you for the information you provide.
Yes, we’ll send that over right away!
Could I please get a copy of the bulletin on the cp4 fuel pump failure? My 2012 is in the shop now with the same issue others were or are having! Thank You!
Hello, can I also please get a copy of this tech bulletin. Currently have pump issues, and need further information to decide a course of action.
Hello David, We will get that sent over to you right now. Please let us know how you decide to move forward, we will do our best to assist you.
Good Morning, and thank you for this information. Could I please get a copy of the tech bulletin as well?
2015 GMC 2500 LML
Hello Evan,
Thanks for stopping by, We have sent our bulletin your way.
Could you please send me the info also I have a 2016 Duramax with 40k. I would like to compare the Product number of the pump to see if I need to up grade to the new pump I don’t want to wait till it blows. Thank you
Hello James,
That is by the far only way to guarantee the most out of your stock fuel system, We have sent our Bulliton your way. If you have any questions or need assistance please let us know. We would be more than happy to assist you.
Is this CP4 Fuel Pump used on Other Diesel Engines, (Ford, Ram, etc)? If so what years? Thanks.
Can you send me a copy of Duramax LML / LGH CP4 Pump Failure – Technical Bulletin. I have a 2015 Silverado 3500HD with 30,000 miles on it and need to bring this to my dealership attention.
Thanks Ace Clark
Certainly! We’ll send that over right away.
Hey Jim, I have a 2016 6.6 and my question would be is the cp4.2 a lasting option, or should this pump be considered a long term maintenance procedure. My last 02 6.6 had 443,000 miles with no replacement. Just wondering if I plan on keeping this truck should I replace a CP4.2 every 60,000
Hi Eric- With proper maintenance the CP4 pump can last well over 60k miles. We recommend adding a list pump & running a fuel additive. Alternatively we do carry a CP3 conversion kit. Please feel free to give us a call if you’d like to discuss the options.
2015 denali with 306000 on it . Is there any hope of gm helping g with the repair bill?
Hi John- Unfortunately with 300,000+ miles your chances of getting a repair covered by the manufacturer are probably slim but it’s worth asking as there’s nothing to lose. Please let us know if we can help you with the parts to get your truck back on the road.
Can you send it to me as well?
Thanks.
Yes Paul – it is sent!
I would also appreciate the bulletin as we have a 16 HD3500 w/ 67k on it. No problems yet
I’d also like info on the cp3 conversion kit
We have the lifetime drivetrain warranty. Will this affect it?
Hello Patrick, we will send that information over right away. In regards to the warranty, that would be something we recommend discussing with the warranty provider before performing any work on the vehicle. Best of luck!
Good Morning. Do you have the Ford Technical Service Bulletin related to the CP4 failure? If so could you please email it to me. I have a 2013 F-250 with the 6.7 Turbo Diesel.
Hello Keith – we do not yet have such a document but we appreciate your input.
Just had this happen to my truck this weekend 2016 Chevy 3500. Could you please send the tech bulletin my way as well? Thank you!
Hi Cayley- No problem, we just sent a copy of this article to your email. Please let us know if we can help you with any parts to get your truck back on the road.
Why is this not a RECALL ITEM. Why Can’t GMC/Chevrolet do what is right and recall this pump failure.
Hi Ron- This is a good question, unfortunately we don’t have any information on how GM decides on weather or not to issue a recall. Please let us know if we can help you with any parts to get your truck back on the road.
Just here about this issue today. I head my friends 2011 just had the fuel pump issue. I have a 2011 with 73 k. I would like to change it out to be save. Can anyone install the new pump or is it complicated. How about Sea Foam as a lubricant? Please email me the article.
Hi Terry. I’ll send over a copy of the post for you to have – we do recommend going to a qualified diesel technician for the pump replacement, as the Duramax are known for their labor intensive and complex maintenance process. There are many popular additives out there – we recommend Stanadyne Performance Formula: https://www.injectorsdirect.com/product/stanadyne-performance-formula-diesel-fuel-additive/
2016 GMC 2500HD and I was just made aware of the issue with the CP4, I want to be proactive and try to do something before I have an issue with the pump, any way I can have a copy of the bulletin? I will definitely appreciate it.
Respectfully,
SSgt Negron
SSgt Negron- No problem, we’ve sent you a copy of this article. In the meantime, please let us know if you’d like to discuss Stanadyne fuel additive, FASS lift pumps or the S&S CP3 conversions we have in stock to prevent catastrophic failure.
Gentlemen, 2016 GMC Sierra 2500HD, I was just made aware of this issue, any way I could have a copy of the bulletin so I could make my local dealership aware of this before there is a catastrophic failure?
Respectfully,
SSgt Negron
I have a 2015 GMC Denali DRW and at only 46,000 miles, I have just experienced the catastrophic CP4 failure which has trashed my entire fuel system. At 40,000 miles I had the emissions deleted from my truck following a DEF Tank Heater failure. As a result, my local GM Dealer is telling me there is no warranty and I am going to have to foot the bill to repair the CP4 failure. It is obvious to me, especially with all that I’ve now read that the problem is extremely common and has nothing to do with the emissions having been deleted. Has anyone argued this with GM and gotten anywhere? Also, can you send a copy of this tech bulletin to my email?
Thank you-
Hi Zac. We’ll send over a copy of the post for you right away. While we don’t have any experience to share with regards to warranty coverage with GM/Chevy, we do see quite a few of these types of failures and can confirm it’s not generally a result of anything but the pump itself wearing itself to pieces (as far as we can tell). Feel free to give us a call with any further questions you might have at 800-500-0980. Thanks!
Hi – i have a 2016 Denali 3500 with the 6.6 duramax. would you mind sending me a copy of our tech bulletin on this CP4 pump issue. thank you.
Hello Mike,
We have sent a copy of the bulletin your way. Feel free to give us a call with any further questions you might have at 800-500-0980. Thanks for stopping by!
I have a 2015 with 51,000 Miles no problems yet could you send me the info
Hello Duane,
A copy of the Tech Bulletin is headed your way. Thanks for stopping by.
Can you please send me technical bulletin, I have 2016 dealership have replaced the CP4 pump twice in last year. Thanks
Hi Larry – we’ll send that over immediately. Please let us know if you have any other questions!
Hi,
I have 6.6 Duramax in a GMC 3500 HD from 2009.
Mileage is 265000.
Started to develop premature fuel filter failure.
Engine will just stop running.
So far I was able to replace filters
I have researched my problem and ran across your postings.
What would you suggest that I do?
Fuel additive is one remedy.
Thanks!
Hi Elija – We’d definitely recommend checking the screen on your Fuel Pressure Regulator – those symptoms could easily point to a failing/failed pump. No additive out there can solve the issue if that’s the case – so if your pump is failed please take a look at our Pump Failure Kits here: https://www.injectorsdirect.com/product-category/duramax/lml-duramax/
Hi guys,
I have a 2012 3500 with 50k kms on it and feels like I’m on borrowed time after seeing this article in the Calgary herald today.
Is the fuel in Alberta any different?
Please send the bulletin so I can arm myself with info when I go back to the dealer…lol
Cheers,
Mike
Hi Mike – we’ll send that right over.
I don’t think the fuel you get is likely to make it any more or less likely that the pump will fail like this – it’ll just eventually happen even with perfect fuel. There is some evidence to suggest that it’s (at least partially) a lubricity problem, however no amount of additive can make up for that with the modern composition of diesel. If your pump hasn’t failed yet, definitely look at replacing it with the CP4.2 like the one we carry, or even a CP3 conversion kit (coming very soon to our store!).
Slapped Twice !
I own a 2013 Ford F-250. The usual service maintenance is $140 to $180. We were near Reno Nevada on 6-7-19 and I needed a service. We went to Jones-West Ford.
It took about two hours. The bill was $820.00. Outrageous. While in Butte, Montana, on 8-6-19, after about 1500 miles, the truck quit. Long story short. The $800 service technician in Reno did not put the new fuel filter seal on. (comes with a new fuel filter) The old seal failed, stressing the high pressure fuel pump (CP-4). Prior to the CP-4 fuel pump failing, little pieces of metal were spread throughout the system. End result $9,000.00 repair bill. I filed a complaint with Ford Motor Co. who said they would contact the dealership. Haven’t heard from either. There is an ongoing class action lawsuit against Ford about the CP-4 fuel pump failures causing extensive damage.
Could you please send me a copy of the bulletin. I have 2016 2500.
Thank You
Will do – thanks Al!
Could you please send me a copy of the bulletin. I have a 2016 Chevrolet 2500HD
Thank You
Hello Michael, Thanks for stopping by, we sent a copy of our bulletin your way.
I have a 2011 Silverado 2500HD with about 110,000 miles. No issues yet, a friend alerted me to this issue. Could you please me a copy of the bulletin. Thank you.
Sure thing, Tom- we’ll send that over for you.
I have a 2015 Silverado 2500 HD with about 90K miles. I have not had any issues yet, but am worried about almost being out of warranty. Could you please send me a copy of the bulletin. Thanks.
Sure thing, Robert. We’ll send that right over.
I have a 2015 Siverado 2500HD with 90K miles on it. Am worried about this failure happening after y warranty. Can you please send me this bulletin?
Thanks
Sure, we’ll send over a copy via email. Thanks Robert!
A contractor friend of mine just had this happen to his 16 Chevy. Makes me worry about my 13. I would love to get a copy of the bulletin. Thanks
Hello Chris,
I’ll send a copy your way right now! If you need anything else please let us know.
Could you please send me a copy of the bulletin relating to the CP4 failure? I have a 2012 with 100,000 miles. I have not been using an additive. Could you also send me information on how to identify which CP4 version I might have? My truck was pre-owned and had some front end damage repairs. Maybe the pump was replaced but I don’t have any details of repairs.
Hello Sherwin, We would highly recommend to start using Stanadyne in your truck to elongate the life of your fuel system – https://www.injectorsdirect.com/product/stanadyne-performance-formula-diesel-fuel-additive/
The only way you can tell if you have the new pump by checking the part number on it. The New Bosch Part number is 0 445 010 817.
2011 GMC LML here, I don’t want the CP4 issue in my truck so I would rather get in front of it now. I’m over 200K miles and use it as my tow and personal vehicle. I need reliabilty, looking to upgrade to a more reliable Injection pump. I’ve read that the CP3 conversion is better. What is the main difference between the CP4 updated version and how is the CP3 conversion better or worse than keeping it CP4 with the updated pump? I would also like a copy of the bulletin if possible. Thanks, this worries me a lot since I would rather not pay the $$$$ insane repair prices.
Hi Marvin,
If you’d rather not replace the CP4 with the updated CP4.2 that we offer from Bosch, the CP3 Conversion Kit from S&S Diesel offers an alternative that moves completely away from that pump type into a modified version of a previous generation CP3 pump. While any pump is susceptible to failure from some causes (water in the fuel is a prime example), anecdotally the previous CP3s have a lower failure rate overall and has the reputation for lasting longer. While we don’t have a way to quantify that difference in lifespan average, the CP3 conversion is becoming an increasingly popular choice for LML drivers. We’ll email over the bulletin for you right away- feel free to give us a call or email with any other questions.
I have a15 Silverado 34000 mi no issues yet but would like the bulletin please it’s my work truck may need to update before it pukes!
Hi Roger- No problem, we’ll send that over right away. In the meantime please let us know if you’d like to discuss the preventative measures we offer such as fuel additives, Fass lift pumps, or even the S&S CP3 conversion.
Could you please send me a copy of the bulletin on the CP4 failure. I have a 2015 Chevrolet 2500HD with 46,000 miles and mine just quit.
Hello Scott, Thanks for stopping by, we sent a copy of our bulletin your way. Let us know if you’d like to discuss the options we offer to get your truck back on the road, such as our complete LML Pump Failure Kits, fuel additives, Fass lift pumps, or even the S&S CP3 conversion.
Please send bulletin and the attorney info on the class action lawsuit if you have it. I have a 2012 with 134,000 and entire fuel system trashed. Looking at $9300 repair bill. Thanks
Hi Burt- Sorry to hear about your truck. Unfortunately we don’t have any legal information available but are happy to share a copy of this article. Please let us know if we can help you with the parts needed to fix your truck, we can get you back on the road for a fraction of the cost the dealer is trying to charge you.
Can you send a copy of the bulletin as well. Thanks for the awareness with this article.
Hi James- No problem, we’ll send a copy of the article over right away. Please let us know if we can be of any further assistance.
Please send me a copy of the bulletin. Thanks!
Hi Misty – we’ll send that right over! Please let us know if you have any other questions.
can you please send me the bulletin , i have a 2013 2500 hd with only 77k . it just happened to me.
Hi David- I just emailed you a copy of the article, please feel free to give us a call if we can help with the part necessary to get your truck back on the road!
2016 2500 Duramax, 36k miles just happened. Can you please send me the bulletin? $17700 fix.
Hello Stephani, we will get that sent over right now, If you need anything in regards to getting your Duramax back on the road please let us know!
Will you please send me a copy of the bulletin? Thanks.
Hello Joe, Sending that over right now, Let us know if you need anything else!
I’ve got a 3500 2016 Duramax. Would like to see that service bulletin too!
Hello Mike, Thanks for stopping by, well send that over to you right now. If you need anything else do not hesitate to let us know!
Could you please send me a copy of the bulletin. I have 2014 2500HD with 94000km and had this fail in July.
Cheers!
Could you please send me a copy of the bulletin. I have 2014 2500HD 94000km and failed in July.
Thank You!
My 2015 is in the shop right now getting the full treatment. Could you send me a copy of the bulletin. Do the newer ones have this problem? Thinking about trading before this happens again. My cousin is going through this for the second time..First was under warranty, not the second. Thank you.
Hello Allen, We will send a copy over right now. Starting in 2017 GMC/Chevy transitioned to a new engine referred to as the L5P. This has a new style of pump and injectors that differ from the Early CP4 models in the LML/LGH Engines. Therefore they, fortunately, do not share the same fate as the stock CP4 model engines.
My friend has a 2018 and it is already experiencing the failure issues
Hi Brian- The 2018 L5P uses a different type of pump (Denso HP4). We do carry those as well, please feel free to have your friend contact us to discuss. Thanks!
My Bosch pump just failed on my 2015 Silverado 3500 HD. Almost $10000.00 to fix. I only had 32K on my truck to pull Raptor Toy Hauler. Would you please send me the bulletins or info you May have accumulated on these failerd.
Hi Drew,
Yes, we’ll send over a copy of this post for you right away! Please let us know if you need anything else.
2015 Siverado 2500 (47K miles) left me and my family stranded on a 11% grade in a busy lane of traffic just yesterday…scary deal. Dealer just called and guess what…it’s the pump. It’s a couple months out of warranty is all. Quote was for 11K. I asked them to check with GM to see if they will pitch in to help but havent heard back yet. I would like a copy of the tech bulletin please. Also saw mention of a class action lawsuit above and would like more info on that if anyone has any. Thanks
Hi Don, we’ll email a copy of this post over as requested. I’m afraid we don’t have any other information on the class action.
We have two friends that have had this problem, and we are a 2014 HD2500 owner as well. Can you please send me a copy of the tech bulletin?
Hello Robert,
We will send you a copy your way. If there is anything we can assist you with please let us know.
Can I get a copy of the bulletin?
We’ll send over a copy for you via email – thanks!
Please send me a copy of your tech bulletin!
Hi Dan- No problem, we’ll send a copy of the article over right away. Please let us know if you have any questions or if we can help you out with any parts to get your truck back on the road.
I have a 2016 duramax. Can you send me the technical bulletin?
Thanks
Ken
Hi Ken- No problem, we’ll send a copy of the article over right away. Please let us know if you have any questions or if we can help you out with any parts to get your truck back on the road.
My 2016 2500 duramax with 57k has been at the dealer for over a week due to a loud internal clunking noise. They literally have not called me once with an update and I keep getting redirected to VM. So stumbling on this thread – its possible this is the issue and its caused some serious internal damage. If I didn’t have a loaner from them I would have been in there demanding answers a lot sooner but that’s about to change.
I wouldn’t mind seeing this bulletin before I walk in there tomorrow.Thanks!
Hi Jon – the bulletin is just this post we put together to let folks know about the information we’ve gathered on the pump failures. There is no official GM Bulletin on this as far as we know. I’ll send over a copy of this post for you via email just in case.
Can you sent me the service bulletin please
Like everyone else I’m pretty sure my CP4
Has taken a dump…..
Unlike everyone else the estimate I got from the dealer I brought it too was $18,000!!!!!!
Maybe the replacement they plan on putting in is gold plated
Or something!!??
But the general consensus here is 10-13k
( I don’t want the gold plated one)!!
Frankly I don’t want to be doing this at all after spending 65 k on a truck I planned on having for a VERY long time!!
I’ll email you over a copy of our bulletin as requested. Please let us know if there is anything we can do to help!
I too would like a copy of the tech bulletin. Have been looking to buy a Duramax but not if it’s gonna cost me ten grand to fix a known engineering defect.
Thanks for posting this it’s a good thing that you are doing.
Hi Fred, Thank you for stopping by, we got a copy of our bulletin sent your way.
I have a 2016 3500 Dually in the shop now for this. Did the 2016’s come with the 4.2?
130k, dealer quote $8500 before tax
Hello Joseph,
Most likely your 2016 came with the original CP4 Pump, however, the only way to be for sure is by checking the part number on the pump. The Bosch part number for the CP4.2 would be – BOSCH ® Part # 0 445 010 817
hello do you have this kit available and whats the price for it. Do you guys recommend installing a lift pump kit to help cp4 pump, do you guys sell it.
Hello Rafael, We do have all of our CP4 LML/LGH Kits in stock ready to ship out today. The prices vary depending on which kit you would like to order. We would recommend a Fass lift pump if the funds are available to do so, as it is the industry leader in diesel fuel filtration. Please give us a call at 1-800-500-0980 and we would be happy to answer any other questions you have or assist you in placing an order.
We look forward to hearing from you.
Owner of a 2011 gmc 2500 can I get an copy of that service bulletin.
Thanks
Hi Brad – we’ve emailed you a copy of the post for your records. Let us know if you need anything else!
Hello Brad,
We will send you a copy your way. If there is anything we can assist you with please let us know.
Hello. I have a 2016 2500hd, and would like a copy of the service bulletin. Thank you!
Hi Mike – we sent over a copy of the post as requested. Please let us know if there is anything else we can help you with!
Hello, Can you please send me a copy of the bulletin. Having similar issues. Thank you!
Hi Josh – we sent over a copy of the post as requested. Please let us know if there is anything else we can help you with!
Can you send me a copy of the service bulletin. I have a 3500HD 2014 with 112000k mike no failure yet.
Hi Ken – we sent over a copy of the post as requested. Please let us know if there is anything else we can help you with!
What is the difference between the stock CP4 and your updated CP4.2 version? Not sure if this was already asked.
vr
John Pinksaw
Hi John – I’m afraid Bosch doesn’t publish what was changed in the CP4.2 design, at least as far as we have been able to find.
Was wondering if anybody in Canada has info for a lawyer on this class law suite as gm will not help with any type of warranty and gm should be going good for this any info would be appreciated
I have a 2014 2500HD with the Duramax with 142000 miles. At 128000, my cooling fan went out. While doing the repair, the dealer suspicioned something with the pump. They found the turbo vane solenoid sticking and replaced the solenoid and cleaned the turbo vanes. Is this indicative of the catastrophic failures others have had? Please send me a copy of the service bulletin.
Thanks,
David
Hi David – while there is no service bulletin from GM that we’re aware of, we’ll gladly send you over a copy of our technical bulletin on the problems with the CP4 pumps. Let us know if you need anything else!
What changed between the CP4 and the CP4.2? Please send copy of service bulletin. Thanks much.
Hi Curtis- No problem, we’ll email you a copy of the article. The CP4.2 internals are made from updated materials that are less prone to catastrophic failure. Please let us know if you have any further questions.
I have a 2016 Silverado HD Duramax. Had it built and received it in October of 2016. Does this truck have the same pump? If so can I replace it with something different to avoid this problem? Truck has 60,000 miles thanks. Also would like copy of service bulletin. Thank you.
Hi Kenneth- We have a CP3 conversion kit available if you’re looking to get away from the CP4 platform. If you’re simply looking to prolong the life of your original CP4 pump we can definitely help, we recommend running a fuel additive to add lubricity and a lift pump for additional filtration. We carry Fass lift pumps & Stanadyne Performance Formula additive, please let us know if we can help you with either. We’ve also emailed you a copy of this article in the meantime.
I have a 16, 32k. No problems, but as I’ve been seeing issue’s I’ve been runnining kleen diesel as an additive. I want a new 2019 as I need a tax right off for next year. Are the 19’s fixed?
Please send me the bulletin and any other info I may need regarding my truck. Thank you in advance Jon.
HI Jon- No problem, we’ll send a copy of the article over right away. For your 2016 we have a CP3 conversion kit available if you’re looking to get away from the CP4 platform. If you’re simply looking to prolong the life of your original CP4 pump we can definitely help, we recommend running a fuel additive to add lubricity and a lift pump for additional filtration. We carry Fass lift pumps & Stanadyne Performance Formula additive, please let us know if we can help you with either. The 2017-Current Duramax uses a Denso HP4 pump that so far has shown to not be prone to catastrophic failure.
I have a gmc 2015 1 tonne diesel. In 2018 just after having it serviced at bannister gmc in kelowna british columia canada on way hime it shut down in the middle of a busy intersection. A week later they replaced the entire fuel system. If it wasnt under warranty( had 79,000 km on vehicle at time) they said it would have cost me near 20,000 canadian to fix.
Reading your web site i am now paranoid it will happen to me after 10000 more km when i hit the 100000 mark.
I dont know they put the 4.2 pump in. When did they start putting the 4.2 in the parts stream. Any advice for the retired paranoid canadian?
Hi Marv – while we can’t tell you a date when GM started using the CP4.2, the part number from the pump would end in “817” for the up-to-date version. Often the only way to verify would be either taking it apart to unearth the pump or perhaps using a boroscope to read the part number off the pump if possible.
My 2016 just grenaded with less than 40,000 on it luckily train warranty will cover it my advice to your followers upgrade regardless of mileage thanks for the Stanadyne tip
I wonder if the biodiesel we are forced to run here in the midwest might have additional lubrication vs elswhere in the USA? Reason I ask, I had not heard of this problem until seeing the class action lawsuit advertisement. While I am not totally immersed in the diesel pickup arena, I have one and have friends who have them.
Will be interesting to see how this plays out. Of course, I am concerned about my own 2016 LML
Hello Randall,
While it is true that Biodiesel inherently has more lubricity then regular Low-sulfur Diesel, making it an added benefit to your fuel system, we have not seen any biased for where the pump failure has occurred. We Have customers in every state across the nation on a regular basis calling in for parts or advice on their LML pump failure.
Replacing your pump would be highly recommend if you have not yet experienced pump failure.
If you have more questions regarding this or would like to order parts for your duramax please give us a call at 1-800-500-0980.
We look forward to hearing from you.
We have 2016 2500 Duramax that has has excessive high pressure fuel leak all lines and fuel rail replaced leaking again could CPU cause problem with line ability to seal ? Please send me a copy of bulletin Thanks
Hello Steve,
Leaks are normally caused by a line that isn’t seated correctly, worn down/rusted or bent. We always recommend trying to reseat the lines if they are new and torqueing to factor speciation. If the problem persists, mostly like the line will have to be replaced.
We sent a copy of our Bulletin your way.
Please send me a copy of the bulletin I have a 2015 and 2016 duramax.
Thanks
Bill
Hi William,
We got a copy mailed your way!
Thank you for stopping by.
Do you sell just the updated CP4 pump? Mine hasn’t had a problem yet, but want to replace pump before it causes a problem.
Thanks!
Hello Kevin,
Yes, we do. We plenty of options in stock ready to ship out today. Please give us a call at 1-800-500-0980 and someone from a Sales Team would be more than happy to assist you.
Look forward to hearing from you!
Just sold my high mileage LB7 and bought a 2012 LML with 14k miles on it 🙁 maybe it was a bad idea !!! Anyways would like to see the tech bulletin and info on a fass lift pump i will start running additive as well and cross my fingers !!
Hi, I recently bought a 2015 2500 Duramax 4×4. It had 29,000 miles on it and I don’t want it to blow up! Can you please send me the bulletin.
Thanks in advance
Hi Jason, I’ll send over a copy of the post for you now. Let us know if you need anything else!
I have a 2011 Duramax, could you please send me the bulletin, thanks
Hi Todd, we’ll send over a copy of the post right away. Thanks!
I have a 2012 2500 HD with 178K miles. I bought it at 59K miles and don’t let repairs go. I’ve replace all of the glow plugs the first time that the first glow plug came up as faulty, replaced the radiator after a small leak and just put new tires on it two weeks ago. Yesterday, my truck died on me. The dealer told me that my fuel pump went out and caused the same damage that you described above. Repair estimate is $13-$14K. If I do this repair, what can I expect will go out next, and how many miles should I expect from this repair? Oh, and can you please send me a copy of the bulletin as well?
Hi Tom- We sent you a copy of the article. Please let us know if we can help with replacement parts for your truck, we have options available that would save you as much as $10,000 on the repair.
I wish this would put GM completely out of business I will never in my entire life ever by another Chevy I bought several and I will not buy another one they need to take care of this problem
Hi Kelly- Unfortunately this issue is not unique to GM, CP4 pumps are also used in Ford Power Stroke & Dodge Cummmins trucks. Please let us know if we can be of any further assistance.
Had 2012 with around 50k miles, this exact thing happened to me while on a trip ti Texas pulling my enclosed tool trailer. Being from ky this was not good. Believe this happed to me in 2014 and I had never heard of this problem. But later found a bulition was out at this time about this. It is one pricey problem when this occurs, between the,,,
Wrecker Bill’s
Motels
Storage for trailer fees
Complete fuel system replacement
Down time from work
Vehicle rentals
Ect.. this is thousands of dollars I didn’t have to be blowing on a problem that was well known by GM and ofcourse no help from them.
Hi Dustin- Sorry to hear you had to deal with that. We have a few preventative options available including FASS lift pumps, Stanadyne Fuel Additive & the S&S CP3 conversion kit. Please let us know if we can help!
Already went thru an issue with GM over steering pitman arm working loose and stripping threads because of their ingenious steering assist,now this issue about their injector pumps,neighbor 5th wheeler clued me in last evening,would you please send us a bulliton? I got a bulliton about the steering the same as this,Gm will stall until someone gets hurt! thank you
Hi Roger- We’ve emailed you a copy of our article, please let us know if we can be of any further assistance.
I have a 2015 with 47K, no issues so far but scared to death now. Can you please send me the bulletin?
Hello Cliff,
We have sent a copy your way. Thanks for stopping by.
Could you please send me the teck bulletin on the injector pump. Apparently mine just self-destructive. ??
Hi Eli- Just sent a copy of the article over, please let us know if we can help you with any parts to get your truck fixed.
HELLO; 2014 GMC with 76K and my truck and had this happen 300 miles from home!! Waiting to her if GM will do me any good??? But please send me the bulletin!! Thanks
Hi David – we’re sorry to hear about the break down. I’ve sent over the email copy of the blog post here for you. Please let us know if you need anything else.
I have a 2012 Chevy Duramax and I here all the horror stories about the failing fuel systems. My truck is running great now but I would love to stay in front of this problem I’m going to start using the Stanadyne Performance fuel additive and thinking about installing the FASS system. Can you send me the bulletin please. Thanks
Hi Danny- No problem, we’ll send a copy of the article over right away. Please let us know if we can help you with FASS or Stanadyne.
There is definately a great deal to learn about this issue.
I love all the points you made.
Thanks!
2015 with less than 25k and fuel filter life showed 50something% yesterday when I left the dealership after oil change, today telling me to change it. Called dealership and they asked, “Is it still running?”….leading to conversation about the above issue….I’m like….you know about this…and…? Lucky for me was not a pump failure and all is well, but after looking into this I’m appalled nothing has been done to offer the upgraded pump or some other fix….please send bulletin!
We’ll send over a copy of the post for you via email. Thanks!
I have a 2015 GMC Sierra 3500 the pump failed on me and the dealership will not do anything about reimbursing me on rental or nothing they are going to fix it it has 93,000 on it would you send me the Bolton it
I’ll send over a copy of the post for you right away!
Please send me a copy.of the bulletin and any info of getting in on a class action against GMC to force them to fix this.
I’ll send over a copy of the post for you right away! I’m afraid we don’t have any information on any pending legal action.
Hello
I have a 2016 duramax with 92000 miles. I’m not having any trouble but I think I might want to upgrade to the cp4.2 upgraded pump and start using a additive
Please let me know if you think this is the best way to go and if you can please send me the price and info on the pump and the bulletin. Also do you have a rough idea of the labor to install the new pump.
Thank you for your time
I’ll send over a copy of the post for you right away! I’m afraid I don’t have any information on labor costs, as that can vary widely.
If you haven’t had a failure yet we’d recommend checking to see which pump you have in the vehicle – a 2016 could have the Cp4.2 already (part number ending 817). The original pump part number ends 619.
Could you please send me a copy of the bulletin?
Thanks.
I’ll send over a copy of the post for you right away!
Hi There,
I have a 2013 Silverado 2500HD. 185,000km on it and the pump failed leaving me on the side of the highway in -25C weather… Not only did the pump fail, but the pump gear fractured and multiple teeth were sent somewhere into the engine for a scavenger hunt. $15k estimate already and they’ve yet to find the pieces of the gear in my engine. Reading the amount of failures Is utterly appalling! GM needs to address this. Thank you for the post and to all the posters for aiding me with this healing process! Please send me the bulletin for my reference. Thanks again.
Will do, Steve. Please let us know if you need any further assistance.
Can you please explain what the difference is between the CP4 and the CP42 thank you
Hi James,
The CP4.2 is the current pump for the LML Duramax, which was an update to the CP4 pump originally used in the vehicle. While Bosch does not publish what they changed on the pump, the overall design is the same, with changes designed to address the specific failures the LML CP4 is known for. We’ve sold the CP4.2 for a couple of years now and have seen good results with them, however we do still recommend adding a FASS lift pump and running additive in every tank to maximize the lubricity of the fuel and reduce wear on the pump and other components. If you have any questions please feel free to give us a call at 800-500-0980. Thanks!
I have a 2013 Lml motor. It in in the shop right now for a change out of the no.1 nox sensor and a Egr valve. The truck only has 27,000 miles on it. Could you email me a copy of the tech. bulletin. Thanks
Hello Ty,
We have emailed you a copy of our Tech Bulletin. If you need anything please let us know!
Could you send a copy of Tech bulletin?
Hi Royce- No problem, we’ll send a copy of the article over right away. Please let us know if we can be of any further assistance.
Hey guys.. I have a 2015 LML Duramax.. wanting to stay ahead of the problem. Could you please send me a copy of the bulletin? Thank you in advance.
Will
Hello William,
Thank you for stopping by, we have sent you a copy of our bulletin your way. If there is anything you need for preventative maintenance don’t hesitate to reach out to us!
I just had a great Christmas gift yesterday, Christmas Eve. My 2015 3500 died and the verdict is the fuel pump. Looking at a $10,000+ bill when I’m out of work. Time to make Lemonade! 🙂
Any chance that I could get that Bulletin everyone is reffering too?
Cheers and Merry Christmas
Hello Ron, we are sorry to hear this came as an early Christmas surprise. If you need any parts for your truck and want to save money from shop/dealership part markups let us know. We have emailed you a copy of our bulletin your way.
We look forward to hearing from you.
Your info is very informative, I seem to be suffering the pump failure issue! 2016 GMC Denali 2500HD has the same symptoms. Please send bulletin sitting at 105k so feel some debating will be going on with GM.
Hi Mike- No problem, we’ll send a copy of the article over right away. Please let us know if we can help with the repair.
Hi, got a 2016 LML with 85k. Run Stanadyne every tank, replace fuel filter at 50% BUT who knows…could I get a copy of the bulletin please? Thank you
Hi Mike- No problem, we’ll send over a copy of the article right away. Please let us know if we can help with Stanadyne, FASS or a CP3 conversion to help prevent a CP4 failure in your truck.
I’ve also got a 2016 2500HD Duramax and concerned that so many owners have experienced the same failure…. please send me a copy of the bulletin/article also. Thanks
Will do William – thanks!
can you email me the bulletin please?
Hi Brian- No problem, we’ll send a copy of the article to your email right away. Please let us know if we can be of any further assistance.
I’ve got a 2015 Duramax cab/chassis We took it to local dealership to do recall for plumbing for dual fuel tank Long story short we have been to this dealership 7 times in the past year due to same issue of this truck still not transfer fuel. This truck has 60;000 miles Is the transfer pump on recall
Hi Jennifer- This issue pertains to the CP4 (high pressure fuel pump), we haven’t heard of any common issues with the transfer pumps. Please let us know if you have any further questions.
I am interested in information on improvements in the cp4.2 pump that you mention in your blog. Could you please send me a copy of your technical bulletin
Hi Richard,
I’m afraid we don’t have any additional information aside from what’s in the blog post – Bosch doesn’t publish what specific changes have been made in the CP4.2 pump. Our best guess would be tolerances and metal alloy differences, to address the specific wear issues. I’ll send over an email with a copy of the blog post so you have that as well. Please feel free to give us a call if you need further assistance – 800-500-0980.
Lost power on my 2015 chevy about a month ago pulling a trailer over the mountains. stopped restarted, ran fine. Then yesterday the wife driving to town the truck quit. I had to prime to get iit started. Could this be a sign of early pump problems? Would like a copy of that blog. thanks so much.
Hello Darrel,
It is possible that a faulty pump or one starting to fail may be the cause. The best way to check is by starting with the fuel pressure regulator on the pump, pull it off and inspect for metal debris. If there is metal debris present, Unfortunately, it may be too late and need a complete overhaul of your fuel system. If no metal is found, You may be in luck! If no other signs of metal in the system are present and/or anything points to the pump being the source of the issue, replace the pump ASAP. This will save you the cost of replacing your entire fuel system when it completely goes. We have emailed a copy of our bulletin your way. Please feel free to give us a call anytime if you further questions – 1-800-500-0980.
Hey guys. Would appreciate a copy of the bulletin as well. Stumbled across this while doing some research on a 16 GMC. Luckily I hadn’t bought it yet…..pretty nervous now! Thanks for your work and input on this issue.
Hi Ken- We’ll send a copy over, please let us know if we can help you with anything else!
I have a 2014 Silverado with the 6.7 Diesel and the dealer says I have a High Pressure Injector Pump failing to the tune of $4000. Can you send me a copy of the please send me your bulletin. Thank you!
Hi Dale- No problem, we’ll send a copy of the article over right away. Please let us know if we can help you out with an updated CP4.2 pump or a CP3 conversion for your truck.
Andrew, I did not receive an email with the bulletin yet. I may have typed my email incorrectly. Please send it again if you could. Thanks so much !!
My understanding is a lot of the fuel pump issues could have been avoided with a lift pump. Seems the 2017 and newer Duramax have an in-tank fuel pump along with the new high pressure pump. Do you think the 2017 and newer GM in-tank fuel pump would fit my 2016 Chevrolet tank?
Hi Jack- Unfortunately the 2017 L5P factory lift pump system isn’t plug & play compatible with the LML platform. We recommend running the FASS system which can be found here: https://www.injectorsdirect.com/product/fass-titanium-signature-series-diesel-fuel-lift-pump-95gph-gm-duramax-6-6l-2015-2016/
Please let us know if you have any further questions.
I have a 2011 silverado. Had this pump blow up at about 95,000 miles. Fortunately it was still covered under factory warranty. I now have 256,000 miles on the same truck. I was thinking I might replace the pump again to avoid the big ticket repair even thought everything seems fine . Preventative maintenance seems alot cheaper than an entire fuel system replacement. What are your thoughts, good idea or just paranoid?
Hello Ron,
That is a great question. Preventative maintenance without a doubt will be your most economical option. Replacing the pump now and starting off fresh by far will save you a lot of time, money and headaches in the future. This will ensure you have the most up to date pump and the best fighting chance of avoiding any pump failure. That pump can be found here – DURAMAX LML LGH CP4 BOSCH ® NEW INJECTOR PUMP
We would also highly recommend considering installing a FASS Fuel Pump if you do not already have one and using Stanadyne in every full tank. This together will ensure the longest life out of not only your pump but your entire fuel system.
If you have more questions regarding any of those products or your LML Truck please give us a call anytime at 1-800-500-0980.
Please send me a copy of the tech bulletin as my 2016 is in gm service as we speak
Thanks
Hi David- No problem, we’ll send a copy of the article over to your email. Please let us know if you have any questions or if we can help get your truck back on the road!
I just got my 2012, 2500HD Duramax it has 99,000 mi.on it, how can I tell if the pump has bin replaced and can you send me a copy of the tech bulletin please
Thanks
Bruce
Hi Bruce, The best way to know if you have an updated pump is by checking the part number on the pump itself. The most up to date pump part number is 0 445 010 817. We have sent a copy of our bulletin your way.
I have a 2015 6.6 worried about fuel pump fail.Is the CP4-2 all updated to work and not fail in this application. thanks and also can you send me the blog everyone is asking for.
Hi Aaron- We emailed you a copy of the article, please let us know if we can help you with any proactive measures on your LML.
My mother’s 2013 has been in the shop for 6 weeks. Not only did the pump shred the system, it also killed her computer. Can I get a copy of that tech bulletin as we are meeting them to discuss it today. Thanks
Hi, I am sorry to hear about your mother’s truck. We will send you a copy of the bulletin your way right now. If you would like to discuss saving money on OEM parts instead of paying the dealer prices to give us a call at 1-800-500-0980. We look forward to assisting you.
Could I get a copy of the tech bulletin. Thanks, Jeff
I’ll send over a copy of the post right away!
Hi I am looking to purchase either a 2015 or 2016 gmc Denali with the 6.6 in it. How can I tell if the fuel pump issue has been fixed?
Hi Randall – the latest version of the pump has a part number ending in “817”, whereas the original part number ended with “619”. It may require disassembly to check the part number on the pump, but if a truck doesn’t have the latest CP4.2 we’d recommend replacing it preemptively, or converting to the CP3 pump we offer from S&S Diesel: https://www.injectorsdirect.com/product-category/duramax/lml-duramax/
If you have any questions please give us a call at 800-500-0980. Thanks!
Could I get a copy of service/tech bulletin? Have a 2015 Chevy 3500 with 87k and pump just failed. Being quoted about $12k to repair. GM apparently wont do anything,
Hi Eric – there is no service bulletin that we’re aware of, but I’ll send over a copy of the blog post for you right away.
I have a 2011 with 65k what can be done to fix problem so my pump don’t fail I don’t have a problem yet trying to fix it before it happens
Hi Tom- We have a CP3 conversion kit available if you’re looking to get away from the CP4 platform. If you’re simply looking to prolong the life of your original CP4 pump we can definitely help, we recommend running a fuel additive to add lubricity and a lift pump for additional filtration. We carry Fass lift pumps & Stanadyne Performance Formula additive, please let us know if we can help you with either.
Could you please send me a copy of the SB. I have a 2012 F250 6.7 ltr that just had this happen to it and it is costing me $8000.00 to have it rebuilt. Do you know of any recalls on them. It only has 141000 miles on it.
Hi Robert,
While there is no service bulletin that we’ve seen, I’d be happy to email over a copy of this post for you.
have a 2015 lml with 160k, massive def issues, but so far pump seems fine, can u send me a copy of the info that you are sending to the people, thank ya’ll for the time and effort, btw which fuel additive do u think is best i use diesel/kleen in the grey bottle? what about seafoam, thanks again,,johnnie v
Hi Johnnie – I’ll send over a copy of the post for you via email. As far as additives, Seafoam is a good one, and we also recommend Stanadyne Performance Formula: https://www.injectorsdirect.com/product-category/stanadyne/
Hi we have a 2016 2500 with 113,000 miles on it just had this happen to us on Sunday could you please send me this. Thank you
I’ll send over a copy of the post for you right away.
Have a 2015 LML Duramax with 105K. No current issues. Wanting to look into preemptive upgrade of pump. Does 2015 need lift pump? Please send bulletin. Thanks
I will send over a copy of the blog post for you – we don’t have any bulletins from GM. A lift pump is recommended to reduce wear on the pump and other fuel components, and to increase fuel lubricity. We recommend the FASS: https://www.injectorsdirect.com/product/fass-titanium-signature-series-diesel-fuel-lift-pump-95gph-gm-duramax-6-6l-2015-2016/
Can you please send me a copy of the bulletin. I have a 2016 Silverado 3500hd with 22,000 miles and is currently being worked on with the fuel system being replaced. There were shaving in the oil pan but indicated that it did not get to the engine.
Thanks for stopping by Alan – we will send over all of the information we have right away! Best of luck.
2015 Sierra 2500 HD Duramax with about 50k miles. I am investigating doing a preventative CP3 swap. Could you please send me a copy of the bulletin. Thanks
I’ll send that over right away. You can find the CP3 conversion kit from S&S Diesel listed here: https://www.injectorsdirect.com/product/ss-s-lml-cp3-conversion-kit-50-state-carb-compliant-with-dpf/
Could I get a copy of the bulletin as well? Thank you.
Will do!
Just had a 2012 lgh shut down with a 8 bad injectors , metal shavings in the fuel pressure regulator and a broken crankshaft . 80,000 miles. BOSCH definitely has problems . Thanks for your posting gm tech bulletin
Sorry to hear that, please let us know if we can help you with the parts to get your truck back on the road.
Do you have a link to the TSB? Or can you send me a copy? Thanks I’ve got two friend I NEED to show them this! Thanks!
We do not have any service bulletins from GM, but I can email you over a copy of this Technical Blog post.
I have a 2011 Duramax that just quit running probably due to the fuel pump issue. I understand that there is a class action suit now pending. Please email me a copy of the bulletin.
Thanks you,
Will do, thanks. Please let us know if you have any other questions about our kits.
2016 Denali with 50, 000 miles fuel pump went out ruining injector cost $10000.00 to fix please send bulletin thanks!
We’ll send over a copy for you right away!
Could you tell me if this vehicle a 2010 GMC Sierra 3500 ( VIN: 1GT7K4B62AF124318) has the CP4 pump? The car fax on it says the fuel inj. pump and fuel rail was replaced at 24K miles. I thought the CP4’s were on 2011 and later, but I found a Service Bulletin No.: PIP5133 that covers 2010-2013 Duramax. Im looking at purchasing this truck, but I don’t want to get into a all the issues everyone here seems to be having..
Based on the VIN it appears you have an LMM Duramax with a CP3, assuming it’s all original and matches the VIN. Confirming the part number off the injectors or pump would also confirm this.
Please email me a copy of the tech bulletin. Thanks!
Hi Bronda- No problem, we’ll send it over right away. Please let us know if we can be of any further assistance. Thanks!
dealer saying my 2015 truck cp3 or cp4 pump failed they want 10.000 to fix 80.000 miles how does this happen it shouldn’t gm should step up please send me info so I can go after them or ways we can all fight to get a class action lawsuite
Hi Frank- Unfortunately we aren’t able to offer legal advice as we simply sell replacement parts. Please let us know if we can help you with the parts you need to get your truck back on the road.
I myself am having pump problems can u send me a copy of the bulletin
Please send me copy of bulletin as well. My 2016 2500hd is being towed to dealer today.
No problem, we’ll email it over momentarily. Please let us know if we can help you with the parts necessary to get your truck back on the road.
Can you please send me a copy. 2016 GMC 3500 with same issue.
Hi Malissa- We’ve gone ahead and emailed you a copy of the article. Please let us know if we can help you with the parts you need to get your truck back on the road.
Can I get a copy of the Tech Bulletin. I just picked up a 2015 Silverado 2500HD. No problems yet but it does have 85k miles on. Info on a CP3 conversion would be helpful as well. Besides the CP3 what else is recommended?
Thank You
DD
Hi David, I’ll send that over via email. The CP3 Conversion kit we carry from S&S includes everything you’ll need for the conversion, and doesn’t require tuning or a delete to be carb compliant: https://www.injectorsdirect.com/product/ss-s-lml-cp3-conversion-kit-50-state-carb-compliant-with-dpf/
Please email me a copy 2017 duramax at dealer low fuel pressure
Will do!
I’m interested in buying a 2017 GMC Denali 3500Hd. It has only 47k miles on it. Carfax says the fuel injectors was replaced at 45k miles. What concerns should I have? Does the cp4 pump come in the 17 also? Thanks for any info you or advice u can help me with.
Hi Terrance,
You can check the part number of the pump that is installed (might have to look at the pump directly to confirm) – if it ends in 817 then you have the current version and should have nothing to worry about other than getting quality fuel. If it ends in 616 then you have the original CP4 and we’d recommend replacing it preemptively. Please feel free to give us a call at 800-500-0980 if you have any other questions!
Hello I have a 2018 GMC 3500 Sierra fuel pump has to be replaced been having reduced power for at least 9 months had all injectors replaced an fuel rail system an still problems going back an fourth with GM so please send me a copy of the test bulletin an any other helpful info.
Will do, Kevin!
I have a 2015 with 170000 on it same pump is this possible
Hi Troy- Unfortunately yes, the 2015 is susceptible to this failure. Please let us know if we can help you get your truck back on the road, we would be happy to assist.
I have 2015 GMC Sierra 3500 dually with 75000 the same problem! Please send me the bulletin copy. Thanks good bless you.
Hi Cesar- We’ll get a copy of the article sent over right away, please let us know if you have any questions or if we can help you with the parts you need to get your truck back on the road.
my duramax is going through this right now and warranty company is not wanting to pay. Can I get a copy of the bulletin
Hi Jay- Sorry to hear that, please let us know if we can help. In the meantime we’ll send a copy of the article over.
My 2014 Duramax with only 46,000 miles is currently going through this failure. Loss of power while driving and wouldn’t restart. Dealer is quoting upwards of $10k. Can I get a copy of the bulletin? Thanks
Hi Aaron- No problem, we’ll email you a copy of the article. Please let us know if we can help get your truck back on the road!
I have a 2016 lml that failed at 104,000 miles. The Chevrolet dealership said the replacement cp4 has been redesigned to have less of a chance of repeated failure. Is this true?
GM covered part of the repair, they gave me a $3,900 “deductible” towards the replacement. So they are admitting it’s their issue, but won’t cover the repairs completely.
I had to wait 4 months to get replacement parts and was without a truck for that time period.
Hi John- Yes, the design of the updated CP4 pump has been changed to reduce the risk of failure. We are very sorry to hear that you had so much trouble getting your truck repaired through GM. If you ever have any issues with the truck in the future, we would be happy to try and help out.
Good morning guys I have 09 2500 hd with 184000 should I change out the pump on it and what do you recommend ? I didn’t see any problems mentioned on that year engine thanks leroy. Could I get copy of bullion also thanks
Hi Leroy,
The 2009 Duramax uses a CP3 pump which is not known for any issues like this – the bulletin covers the CP4 pumps for LML/LGH Duramax trucks in the 2011-2016 range.
That said, with that many miles on the truck, injector/pump replacement might be a good idea if there are any signs of wear. You’ll find our options for the LMM Duramax here: https://www.injectorsdirect.com/product-category/duramax/lmm-duramax/
Good evening, I know this is for GM but the 2019 Rams swapped to using the CP4.2 and I am concerned about my pump failing. Is the CP4.2 a better alternative or should I be looking at doing a CP3 conversion? Thanks in advance.
Hi Michael,
The CP4.2 available in the 2019 RAM is understood to have design updates to reduce the likelihood of failure. However, only time will tell if this is effective or not. We are hoping to have a CP3 conversion kit available for this application later this year. Feel free to contact us at sales@injectorsdirect.com if you would like to sign up to be notified when this is available. Thanks!
Can you please send me the bulletin? I have a 2011 Chev. Every couple of months I get a clunk in the motor while driving then it puts me in granny mode. I can either reset the code with my reader and drive again or I have to prime the fuel pump to get going again. I had taken it to the dealer over a year ago and they did not find anything. I have 166k on the motor and recently it feels that power is not what it was when I first bought the truck. Bet this is the problem.
No problem Jon, we’ll send it right over.
I would like to get copy of the Duramax pump bulletin. Thanks TV
I’ll send that over for you now, Dennis. Please give us a call if you have any questions!
I would like to get copy of the Duramax pump bulletin. I have a 2016 with 62000 miles.
Thanks
I’ll send that over right away, Mike. Please let us know if you have any questions.
Hi guys,
So a 2017 2500hd Duramax will not have this problem?
Thanks for the help
The 2017-current Duramax (L5P engine designation) uses a different pump, known as the HP4: https://www.injectorsdirect.com/product-category/duramax/l5p-duramax/
i have a 2013 duramax hd with 195,000 miles on it havent had problem yet bbut want to get copy of buletin
Hi Rickey- We’ve emailed you a copy of the article. If you haven’t experienced pump failure yet we would highly recommend either a Fass Pump with Stanadyne fuel additive or a CP3 conversion. Please let us know if you’d like to discuss the options further.
Hey would I be able to get a copy of this tech bulletin. I have my truck in the shop due to the file pump destroying it self. Thanks
Hi Nick- No problem, we’ll send a copy of the article over right away. Please let us know if we can help you with the parts necessary to get your truck back on the road today, we have a sale running on the kits currently. Thanks!
Just bought a 2013 Chevrolet 2500HD 177K miles. Previous owner said CP4.2 Pump was changed last year due to being “weak”, was causing lights. Didn’t damage damage downstream components though. No issues since replacement. I‘d like a copy of the bulletin please. Do you know if the new pumps or converted pumps have the improved dual 20 micron screen installation or the original single 60 micron screen installation, which supposedly breaks during failure? Is the dual 20 effective to prevent contamination of downstream components? If new pump doesn’t come with dual 20, should I upgrade myself? Thanks for any info!
Hi Matthew,
As far as we are aware, the original and current CP4 pumps don’t have a different screen – they use the same fuel pressure regulator which is the component where that screen sits. There may be aftermarket versions that use a finer screen, but I’m not aware of any. The screen on the FPR is not as critical as preventing contamination from reaching the pump in the first place by using a 2 micron filter at the filter head, and we recommend also using a lift pump with additional filtration, such as the FASS. Our 2-micron filter upgrade kit and the lift pumps for the 2011-2016 trucks can be found on our site here: https://www.injectorsdirect.com/product-category/duramax/lml-duramax/
Hi I have a 2018 GMC Sierra 2500HD Duramax and it has just over 27000 mi.. On return from a trip the engine started running rough, chugging. The dealer says that there is some kind of residue in the fuel system they want to flush everything in the fuel system and are saying that it is not covered under warranty.They replaced the fuel rails at approx 25900mi because of issues with fuel delivery. I will get more info in the next few days. Please send me any info you might have that will help me deal with this , ie tech bulletin etc.Thanks for your help
I’ll email you a copy of the post – please let us know if you are in need of any replacement parts!
Would like copy of that tech bulletin please
Hi Scott- We’ve emailed a copy of the article, please let us know if we can help you with anything else. Thanks!
Any views on reliability of Bosch CP4 in UK? I have a 35k miles Macan 3-Litre V6 Diesel which has a regular tap coming from close to where the pump is located. Tap occurs only when engine is lightly loaded e.g. town driving, and goes off (or is not audible) when speed and load increased. Engine itself is smooth. Tap seems to be at half engine speed making me suspect one side (piston) may be exhibiting wear or early failure. (I know about the low-sulphur issues in the US diesel and failures are well documented). Garage unable to explain tap and say this is normal for Macan! Many thanks for any views or way forward.
Hi Harry- Unfortunately we don’t have any experience with that particular application as we only deal with light duty diesel pickups in the North American market. Sorry we couldn’t be of more help!
I have a 2018 with 52k miles. Is this still relevant? Or was this corrected in the newer model?
Hi Steve- The 2017+ Duramax L5P uses a Denso HP4 pump that so far does not have a pattern of catastrophic failure issues. Please let us know if you have any further questions!
Hello Andrew, I am the “lucky” owner of a 2012 GMC 2500 Duramax Denali. I purchased it used (so I am unaware of any servicing, or whatever else), and it currently has about 90,000 miles on it. I have not had any real issues, but think I should look into maybe replacing that pump before I do have issues! Can you send the tech bulletin, and any other information that you think would be helpful? Also, is there any external way to tell if this pump has been replaced already? Thank you for your help!
Thanks
Tony
Hi Tony- We would highly recommend using a fuel additive to restore lubricity as well as a lift pump to reduce strain on the high pressure pump. It would also be worth considering either a CP4 upgrade or CP3 conversion. Please feel free to give us a call if you’d like to discuss the options, we would be happy to help! In the meantime we emailed you a copy of the article. We look forward to assisting you!
Thank you for the information and the QUICK reply! What additive would you suggest using? Also, can you send a link for the lift pump that you would recommend for my truck?
Again thank you very much for the quick reply and help!
Thanks,
Tony
Hi Tony- We recommend Stanadyne Performance Formula which is available on our website with free shipping:
https://www.injectorsdirect.com/product/stanadyne-performance-formula-diesel-fuel-additive/
For the lift pump we have great feedback from our customers on the FASS systems which are available on our website and currently on sale:
https://www.injectorsdirect.com/product/fass-titanium-signature-series-diesel-fuel-lift-pump-95gph-gm-duramax-6-6l-2011-2014/
Please let us know if you have any questions or if you’d like to get an order setup, we would be happy to help!
Thanks,Andrew
Andrew,
Thanks again the the FAST reply! I am probably going to wait about 2 (or so) months before I go down this path and order/install what you suggest. I do not have any trips currently planned, and living in Arizona and not having an Air Conditioned shop makes it a little difficult to do this work (It is just too darn hot!).
When I am ready, should I contact you, or just anyone in sales?
Thanks again for your quick reply’s and the information that you provided! Have a great day, and weekend!
Thanks,
Tony
Hey guys, thank you for this article, would you be able to send me a copy of that tech bulletin please
Thank you
Hi Andrew- No problem, we’ll email a copy of the article over right away, please let us know if we can be of any further assistance. Thanks!
Good afternoon,
My 2015 Duramax just left me stranded on the Florida Turnpike Monday. It is at my diesel mechanic currently. They did a quick code, and it did throw a fuel code. Its a ERG Delete, so I know it’s not that. The VIN is 1GT120E81FF193018,does this have a CB4 or CP3? I’m thinking CP4 bracing for the repair bill Friday..he said it could just be the filter, but I haven’t brought this up yet.
Hi David- The 2015 LML does use the CP4 pump that is prone to catastrophic failure. Please let us know if we can help with any parts to get your truck back on the road!
I have a 2012 that just had a new regulator installed and runs irregular sometimes..sounds like i have the same problem. I use the truck to tow a 5th wheel on weekends..thought it would be worthy..ive put over 5000 into it in last 6 months…very dissatisfied with gm. And thier diesel truck…
Same issue here. We have a 2013 2500 Silverado and the pump failed last Friday causing $11,000 in damage. Please send over the tech bulletin so that we may understand the issue and move to resolve. We are looking very closely at your repair package.
Hi Robert- Sorry to hear your truck broke down, I’ve emailed you a copy of the article. Please let us know if we can help you out with any parts to get your truck back on the road.
Please send me a copy as well. 2015 Chevy Silverado LTZ. Just died. Dealer says the fuel system came apart. Sounds just like the rest of the comments on this page.
Hi Jason- I just sent a copy of the article to your email. Please feel free to contact us if you’d like to discuss the options we have available to get your truck back on the road.
I have a 2016 2500 Silverado in the shop right now. Pump blew up. Only has 25,500 miles on it. Been without it for three weeks. Time to look for a different truck.
Hi Bob- Sorry to hear that. Please let us know if we can help you out with any parts to get it back on the road!
I have a 2015 GMC Denali 2500 75,000 miles not having problems yet but would like to have a copy of the bulletin. thanks
I’ll send that over, thanks!
Hi Andrew could you send me a copy of the article and a recommendation on fuel treatments. I purchased 2015 2500HD with 80K on it have no problems now but want to be proactive as I have already been quoted a FASS Lift Pump if this is what is recommended by you guys?
Hi Robert, I’ll send over a copy of the post for your reference. A FASS lift pump and fuel additive like Stanadyne will both help prolong the life of the fuel system components, but we’d still recommend checking to make sure your 2015 truck has the latest CP4 pump already, and replace it if it does not. The Bosch part number for the latest CP4 is 0 445 010 817.
I have a 2012 Savana Lgh with egr and dpf delete and Livewire tuning installed by Bernhausen diesel in Langley BC Canada. Truck ran great and then suddenly started to have stalling issues that happened once a week. Truck would stall, I’d put it in neutral and it fires right back up. Now it’s doing it every couple of kilometers in town but fires up right away. On the highway it drives normal till I back off on the throttle to say come to a traffic jam stop, then she stalls.. Does this sound like a CP4 failure? Or do I need to look elsewhere?
Oh also to mention I get no codes or engine light coming on at all..
Need some help here
Adrian
HI Adrian- The CP4 failure issue usually doesn’t produce intermittent symptoms like you’re describing. If you had pump failure your engine would likely not start or run at all. Please let us know if you have any further questions.
Andrew, I have a 2011 LML with 225K. Had a slow start issue last week, but truck fired up and ran fine. Slow start continued for a couple of days. I was due for an oil change, so did that and picked up a fuel filter. Literally had the filter in the truck when it decided to not start at all. It turned over, fired up, and immediately died. Then nothing. Have you heard of the CP4 failing in this manner? Also, I can feel and hear the relay for the fuel pick-up engage, but I cannot hear the pick-up itself running when I turn the key ON. Hoping it is just a bad pick-up.
Hi Jonathan- Typically when the CP4 pump fails it’s sudden rather than gradual. Have you pulled the fuel pressure regulator to check for metal shavings? Feel free to give us a call at 1-800-500-0980 if you’d like to discuss further. Thanks!
Hello,
Can I please get a copy of the article as well?Have a 2016 Chevy Duramax with 69k miles having fuel filter issues. Truck shut completely down on a busy highway on our way to a vacation 200+ miles from home. Roadside would only tow it to nearest Chevy dealer and once there he said his diesel mechanic is out on a surgery for another 6 weeks. Stranded in a small town with no car rentals, no Uber/Lyft, and 1 hotel room left. We are beyond upset and now having to pay someone to get it to our dealer at home to the tune of at least a $1200 tow. I fear this fuel pump failure is the issue. A completely ruined vacation and wasted time off work now. It is under warranty so Chevy/GM better cover this. Thank you for your knowledge.
Sorry to hear this Alisa, we’ll email a copy of the article over right away. Please let us know if we can be of any further assistance.
Please send me a copy of the article. I have a 2016 Chevy in the shop now with the issue.
Just sent it over Harvey, please let us know if we can help you with the parts for your repair.
Send me a copy please of the article
Hi Jack- No problem, we’ll send it over right away. Please let us know if we can be of any further assistance.
I have had the same failure mentioned in the tread, can you please send me the bulletin, my dealership seems to be lost on these types of failures! Thank you
I’ll send that over for you, Federico. Feel free to give us a call if you have any questions!
Can you please send me the inf..
Thank you.
Will do, Miguel!
Jim / Andrew – My truck is in the shop now with this failure as the diagnosis. I would like to get a copy of the tech bulletin so I can be sure they do the proper repairs. Is it possible to get a copy of that bulletin?
Hi John- We’ve emailed a copy of the article, please let us know if we can help you out with the parts necessary for your repair. Thanks!
Hi Andrew,
Just purchased a 2015 GMC 3500 Duramax with 82K miles. No known problems. Haven’t picked it up yet, flying into Texas in 2 weeks to pick it up. I was unaware of the potential severity of this issue. Before I get on the highway to bring it home, what would you suggest I have done to the truck? I’ll certainly add the Stanadyne additive. I could have them add a FASS lift pump. What is the approximate cost of adding the latest CP4 pump and does this eliminate the potential problem? Thanks for sending on the tech bulletin along with any guidance you may have.
Hi Keith- Updating the CP4 pump, adding a FASS and running an additive are all good ways to prolong the life of the CP4 but won’t eliminate the possibility of catastrophic failure. If you’re looking for the safest option that would be a CP3 conversion kit, which we do carry as well. Please feel free to give us a call if you’d like to discuss further!
My 2016 Chevrolet 2500HD with Duramax as 102,000 miles. This past Saturday while driving on Interstate 30 in East Texas my dash flashed “Fuel Filter Life = 0%” and “Engine going to reduced power” as I rolled without power to the shoulder along with a 20 foot shipping container in tow. I had it towed to Chevrolet. They assume it is a fuel pump failure since there is no fuel pressure. I am going to change to the CP3. Are there any downsides in terms of doing the replacement and labor time? Any driveability or fuel economy issues? I am not really happy about the dealer simply saying it won’t produce fuel pressure and then telling me this was the result of running a $150 diagnostic test.
Hi Darrell,
As far as I know the Cp3 conversion kit we offer from S&S Diesel is going to output the same performance and should not affect fuel economy whatsoever. https://www.injectorsdirect.com/product/ss-s-lml-cp3-conversion-kit-50-state-carb-compliant-with-dpf/
Feel free to give us a call if you have any further questions about that – 800-500-0980.
Thanks!
I bought a 2015 Chevy 2500HD about a year and a half ago. I bought the extended warranty. (5 years or 100,000) The truck has 33,000 miles on it and the injection pump went out. The warranty company is stating they wont cover costs because the truck is lifted. I bought it from the dealership and bought the extended warranty with the truck lifted. I haven’t done anything to the truck. Please send me any information you have on this topic. This is ridiculous.
Sorry to hear the warranty company is giving you trouble Wade, we’ve emailed you a copy of the bulletin & would be happy to help you with the parts necessary to get your truck back on the road.
Please send me a copy of the SB. I am considering preventative upgrades as well.
Hi Marcus- We’ve sent a copy of the article over, please let us know if we can be of any further assistance!
I would like to get a copy of that report too. I have a 2015 GMC Sierra 3400 and I am wanting to swap out that pump.
Hi Stephen- No problem, we’ve sent over a copy of the article. Please let us know if you’d like to discuss the options we have available for your truck!
Could I get a copy also, I am looking at buying one with 185K ,miles on it tomorrow. I do not see any service records of this problem on the truck, but I want to make sure.
Thanks
Hi Jason- No problem, we’ll send a copy of the article over to your email. Please let us know if we can be of any further assistance!
Can you please send me a copy of the bulletin I think my 2016 2500 gmc just failed for the second time and only 118,000 miles
Hi Vince- Sorry to hear you’re dealing with this issue for the 2nd time. I just emailed you a copy of the article, please let us know if we can help you with the parts to get your truck back on the road. We have a CP3 conversion available that will prevent you from dealing with this again in the future.
Hi Andrew – I would like a copy of the bulletin as well please, I had a 15 that failed at 28k, luckily it was covered by dealer. Just bought another 15 with 85k so paranoid about this one going as well, definitely looking at the CP3 conversion.
Hi Michael- Sorry for the delayed response. I’ll send over a copy of the article, please let us know if you’d like to discuss the CP3 conversion, we’d be happy to help!
Hey I’ve been doing a lot of reading on the CP4. I haven’t had a problem with mine yet I have a 2016 LML just curious if I put a lift pump from the tank to the CP4 will this help with lubricating the pump more efficiently?
Hi Jesse- Sorry for the delayed response! Yes, adding a lift pump & running a fuel additive are both highly recommended. Please feel free to give us a call if you’d like to discuss the options.
The TSB is not actually about the pump failing but more about that if the failure causes metal debris to replace the other components that might be effected.I work in a dealer and work on Duramax’s daily and most pump failures that I have seen have not created any metal.
Hi John- Thanks for sharing your insight. We have dozens of CP4 pump cores come back monthly with metal particulate contamination caused by catastrophic pump failure, which seems to be the most common failure mode. The pumps can certainly fail in other ways but it doesn’t seem to be a nearly as common.
hello
is there any issue with the duramax 2020 hp4 injection pump , i have 2020 sierra at4 with 10000 milles and my truck stock at the dealer because they have found some metal part in the fuel filter . the dealer in touch with gm michigan for repair protocol !!!
have any information or bulletin on similar issue ???
thank you
Hi Mike- We haven’t heard of any widespread issues with the L5P HP4, however since most of these trucks are still under warranty it could be something GM is keeping under wraps.
Hopefully the dealer is able to fix your truck under warranty, if not please let us know if we can help!
Thanks,Andrew
Please send the SB. 2106 2500 with 50k miles had the issue. Truck has been at the dealer for 3 weeks.
Hi Eric- No problem, we’ll send a copy of the article over now. Please let us know if we can help you get your truck back on the road!
I would like a copy of the tech. bulletin as well.
Thank you,
I’ll email that over for you now, Bob. Please feel free to give us a call to discuss your truck – 800-500-0980. Thanks!
2016 Chevy Duramax Diesel LML just died on the interstate after flashing change fuel filter. Just died. It will crank but just acts like its not getting fuel. Had no other problems up to this point. Can you email me a copy of the bulletin and do you have any ideas? Thank you!!
Hi Juanita,
That failure definitely sounds familiar, and does point to a pump failure. We’d recommend getting it diagnosed by a reputable diesel technician to confirm, but it’s likely that the pump and entire fuel system would need to be replaced. I’ve emailed you a copy of the blog post for your use. If you have any questions about the replacement kit we offer, please give us a call at 800-500-0980. Thanks!
hey guys i have a 2015 silverado 2500 and its been nothing but problems with the emissions system nowit won’t start took it to dealer and they wanted 1700 plus parts to replace the pressure regulator and possible 5 k plus parts if debris are found in fuel injectors I broughtthe truck home and don’t know what to please advise
Hi Ernie- We would be happy to help, please give us a call at your convenience 1-800-500-0980. We look forward to hearing from you!
Hi Guys, fighting with the dealership on this fuel pump issue. Mine just went at 111k and the dealer wants $10,300 to repair. Can you send me over the TSB?
Thank you,
Darryl
Hi Darryl,
I’m afraid no TSB exists for this issue – but I’d be happy to email you a copy of our Technical Blog post for your use. Let us know if you have any questions about the pump failure kits we offer for the LML Duramax.
Please send me a bulletin on diesel injection pump. I have a 2012 duramax and love it. Thanks ckbasstracker@yahoo.com
The truck had been surging the past few trips and my husband thought he just got some bad fuel. And then it happened! Fuel filter life went from 80% to 15% to 0% and the truck died in a matter of 45 seconds. And since it happened, we are just now finding out about the known failure and class action suit. We have a 2015 GMC 2500 HD Denali with 78000 miles. Great truck! The dealer is working with us since it is a known problem and only charging around $3k. Is there a better pump made today to fix this or are they replacing it with the same defective pump? We did run an additive about every 3rd tank. This will now be done at every fill up. Should this new pump be replaced at 100K or sooner? Can you please send me the service bulletin. Thanks so much!
Hi Annette, I’v sent that over via email as requested. If you have any questions please don’t hesitate to reply to my email or give me a call! Thanks!
Thanks for info & support. Would you please send me your popular “Technical Blog Post”? Thx
Hi- We emailed you a copy of the article, let us know if you need any further assistance.
Please send me a copy of the bulletin. I have a 2011 Duramax. Thanks!
Hi Thomas- We just sent over a copy of the article, please let us know if we can be of any further assistance!
Hi, I have a Chevy 2500 2015 with 75 000 km without any problems. A diesel tech that is familiar with the fuel pump failure told me its not neccesary to do a CP3 conversion, only add a lift pump and additive.. Is that enough ? And I would like a copy of the bulletin. Thanks !
Hi Philippe,
A lift pump and fuel additive, as well as upgraded 2-micron filtration are recommended for any diesel as a good way to protect the system, but even that will not guarantee you don’t have a CP4 failure. The CP3 pumps are typically a lot more reliable, all other things being equal, so if you have the budget and would like to avoid that future maintenance, it might be a good thing to consider. At minimum, I would recommend checking your CP4 and confirming if it’s the latest version, part number ending in 817. If not, replacing or converting it before it fails will save you a lot of cost in parts. Please feel free to give us a call to discuss those options if you need – 800-500-0980. I’ll send over a copy of our post for you via email as well. Thanks!
Can I get a copy of the tech bulletin for 2013 Duramax, thanks
Hi Nick- I just sent over a copy of the article per your request. Please let us know if we can be of any further assistance!
Have a 2015 Chevrolet Duramax. Died out on me instantaneously 2 days ago and my local diesel mechanic told me fuel pump came apart and will have to change out all fuel components and flush tank just like your post states. 8 K will be the bill. Can someone pass on if they have any recalls or if the class action lawsuit is getting any leverage. I think this should be an issue addressed by manufacturer.
Hi Philip- Although we are unable to offer legal advice we would certainly be happy to help you with the parts you need to get your truck back on the road! Please feel free to give us a call at 1-800-500-0980 if you’d like to discuss the options.
We just had our 2015 Chevy Duramax die. Fuel pump catastrophic failure. Cost $12,000.00. Can you please send me the tech bulletin.
Hi Mike- I emailed a copy of the article over a moment ago, please let us know if we can be of any further assistance!
Can you please send me info on the tech bulliten and the class action suit?
Hi Jayson- We don’t have anything to do with a class action lawsuit and unfortunately are unable to offer legal advice. However we did send you a copy of the article and would be more than happy to help you with any parts you may need to get your truck back on the road!
Would it be possible to get a copy of the tech bulletin? My friends 2012 just had a catastrophic fuel pump failure and I fear my 2015 may be next. Thanks.
I”ll email a copy of the post for you to save. Feel free to give us a call at 800-500-0980 to discuss the kit options if you need!
Thanks,
Jim
please send me copy as well thank you ours is at 200K and it went out yesterday UGH!!!
Hi Elsa- Sorry to hear you had a pump failure, we would be happy to help get you back on the road. Please feel free to give us a call if you’d like to discuss the options we have available. In the meantime we’ve emailed you a copy of the article. Thanks & we look forward to hearing from you.
Hi there, any comments on the exergy fuel system saver? I have a 2016 LML 2500 with 83k (kms) on it and am considering this upgrade. No failures, but i’ll be searching for which injector pump I currently have.
Could you please provide me with the bulletin for my review and records?
Thanks!
Hi Ryan- We don’t carry the Exergy regulator so we are unable to speak from experience. The updated CP4 (or CP3 conversion) along with a FASS lift Pump and Stanadyne additive are very popular options for our customers though. We emailed you a copy of the article, let us know if you have any questions!
Can you please send me a copy as well. 2015 gmc 2500 went out yesterday and quoting 11k to fix 🤢
Will do, Katie. Feel free to give us a call at 800-500-0980 and we’ll be happy to help get your Duramax back on the road.
What about a 2017 2500 GM duramax?
Hi Cathy,
A 2017 Duramax should be the “L5P” model engine (VIN will have a “Y” in the 8th digit position). That truck will have an HP4 pump rather than a CP4 pump, and so far hasn’t shown to have any particular propensity for failure. You can find the products we carry for that model here: https://www.injectorsdirect.com/product-category/duramax/l5p-duramax/
If you have any other questions please feel free to give us a call at 800-500-0980!
im looking at purchasing a 2012 with lml motor. it has 133000 miles. its all original. if the truck runs and drives, is there any possibility of unknown engine damage already? what is the first ting I need to do if I do purchase?
Jeff
Hi Jeff,
Unfortunately it is difficult to tell if there is any damage that has already occurred or not. The good news is that if you do not have any check engine light illumination or any fault codes stored in the engine control module, then it is less likely that a failure has occurred. We would definitely recommend installing a lift pump and utilizing a good quality fuel additive such as Stanadyne Performance Formula to help reduce the chances of future failure. I have included links to these products below:
https://www.injectorsdirect.com/product/fass-titanium-signature-series-diesel-fuel-lift-pump-95gph-gm-duramax-6-6l-2011-2014/
https://www.injectorsdirect.com/product/stanadyne-performance-formula-diesel-fuel-additive/?attribute_select-size=16+oz.+%28Case+of+12+Bottles%29
Please reach out to us at 800-500-0980 if you have any further questions.
Thanks!
Same as the many on here
2015 dura max is in the shop
Pls send bulletin
Have you heard of anyone going back to GMC with some sort of claim. This many should be a recall
Hi Jeremiah,
There is no TSB or recall from GM that we are aware of. I’ll go ahead and email you over a copy of our post. Give us a call at 800-500-0980 if you have any questions!
Can i get a copy of this TSB sent to me.
Hi Dwayne- We emailed you a copy of the article, please let us know if we can be of any further assistance!
Could you please send a copy of TSB
Hi Frankin- We emailed a copy of the article, please let us know if you have any questions!
Can you please send me a copy of the bulletin?
Thank you
Hi Julio – We have emailed you a copy of the article. Please let us know if you have any questions or need help with some replacement parts. Give us a call at 800-500-0980 if you have any questions!
Are there any mechanics you recommend to do this upgrade on a 2015 Sierra? Also info on replacement for my truck
Hi Julio – Please contact us directly at sales@injectorsdirect.com. Depending on your location, we may be able to recommend a repair shop for you. Thank you!
Will you send me a copy? 2016 duramax died a week ago replaced cp4 pump now won’t start when warm
Hi Robin – We have emailed you a copy of the article. Please let us know if you have any questions or need help with some replacement parts. Give us a call at 800-500-0980 if you have any questions!
Hi. I have a 2011 Chevy 3500HD Duramax. Its been at a shop for almost a month and was informed today that its highly recommended to change the entire fuel system out for around $9000! Are there other options? What is recommended? Can i be sent any information to help the issue? Please anything would be helpful! Also is there any recalls or warranties? Yes i know it’s a 10 year old truck, just want to know if anyone or anything is able to help and better the situation!
Hi Anthony,
We are sorry to hear that you are having issues with your truck. We have Genuine OEM parts kits in stock to address this problem specifically. Please give us a call at 1-800-500-0980 and we would be happy to help you out!
Are there any updates on whether or not GM is going to recall these pumps?
Hi Corie- Unfortunately GM hasn’t issued a recall for this particular issue as of now. Please feel free to call us if we can be of any assistance. Thanks – Andrew
I have a 2015 Duramax with 83K miles in the shop now with what appears to be CP4 pump failure. Please send bulletin.
Hi Rick – We have emailed you a copy of the article. Please let us know if you have any questions or need help with some replacement parts. Give us a call at 800-500-0980 if you have any questions!
I have a 2013 Duramax LML. Pump went out at 103,000 . 3000 off warranty. GM refused to help me. $8100 repair.
Sorry to hear that Glenn. We can help you with the parts to complete the repair much cheaper, feel free to reach out if you’d like to discuss further.
Can you send me a copy of the bulletin too? 2016 LML fuel pump failed and dealership wants $14K!
2015 LTZ 2500 LML no issues so far 112000 miles, how do I get the bulletin just so I have it?
Hi William- We just sent it over, please let us know if you’d like to discuss the preventative options we offer to avoid catastrophic CP4 pump failure on your LML.
I have a 2014 duramax that had cp4 failure at 31000 miles. The dealer fixed it with a cp4.2, replaceing the entire fuel system. 2000 miles later the cp4.2 failed and again required the fuel system to be replaced, now i have another cp4.2 and am afraid to drive it for fear of another failure. I would like to get a copy of the bulletin if only to show what junk this high pressure pump is.
Hi Steve- I’m very sorry to hear that you are having repeated failures. I might suggest you consider taking a look at our CP3 conversion kit that we have available. It has proven to resolve the issue once and for all. You can find more information about it here: https://www.injectorsdirect.com/product/ss-s-lml-cp3-conversion-kit-50-state-carb-compliant-with-dpf/
Please let us know if we can help you get the parts you need!
My truck is scheduled for head gaskets and want to replace Injector pump at same time as that will save me a bunch of labor. Is the new CP4 worth putting in, or just go to the CP3?
Hi Jim- We would definitely recommend considering the CP3 Conversion if you have the budget available. It has proven to be a reliable and durable fix for this issue. Please let us know if we can help you get the parts you need!
2015 GMC 3500 63,000 MILES FAILED CP4 PUMP $ 11,500 TO BE REPAIRED AT THE DEALER.
TRUCK IS WELL MAINTAINED. HOPING GM WILL DO THE RIGHT THING AND COVER IT.
Hi Craig- Sorry to hear your having issues with your CP4. We offer a variety of parts to resolve this issue if things don’t work out at the dealership. The CP3 Conversion kit is a great once and for all solution. Please let us know if there’s anything else you need we can help with!
Just read your report on the fuel pump failures I have a 2011 3500 GMC 63000 miles can you send me the tech bulletin I want to stay on top of this
Thanks for the heads up
Thanks for reaching out John! We emailed you a copy of the article, please let us know if we can be of any further assistance.
Can you please send me a copy of the tech bulletin? I just had this exact catastrophic failure and am figuring out how to repair this issue. So happy I found this site.
Hi Dan thank you for reaching out to us! I have just sent a copy of the bulletin to your email don’t hesitate to reach out to us if you need anything else!
Can I have a copy? My truck died yesterday and the dealership want $14!!!
Hi Michael, I have just sent a copy to your email address. Let me know if we can help you source any of the parts you will need!
Can you please send me the service bulletin? I have a 2016 LML with 87k miles, no start. I appreciate it.
Hi Corie, I’m more than happy to send a copy of this to your email. Please let us know if you have any other questions or anything we can do to help!
Hello, I just found out through a friend that there is this known, by Chevrolet, fuel pump failure problem. Could you email me the TSB please? I’m very concerned about this. Do you recommend installing the FASS pump as a good preventative measure against this failure? Is there a way to identify the CP4 pump from the other pumps? Did they put these pumps on all 2500 trucks?
Hi Daren, I’m more than happy to send over a copy of the bulletin to your email. The FASS Lift Pump is a great option to improve overall filtration of the fuel system and prolong the life of your current pump. We have plenty of FASS options in stock, let us know if there is anything else we can do for you!
Thanks, I appreciate it!!
Brady,
Could you send me a copy of this tech bulletin text? I have a 16 Chevy Silverado 2500HD Duramax LML. Thank you for your time and help in this matter.
Hello Jacob, Thanks for reaching out! We emailed you a copy of the article.Let us know if you need anything else.
2016 chevy 3500hd is in shop having the $10000 repair done as we speak, this has totally blind sided me. Please send tech bulletin text, thanks
Hi Bryan, I will be sure to send a copy of the tech bulletin to your email. Let us know if there is anything else we can offer you!
Hello,
i am not sure if this is the issue i am havening but it seams like it… fuel filter light came on and truck turned off…
please send the bulletin, and do you know if anyone has been successful in getting the repair covered by warranty, my truck is a 2013 and has 127000 miles so i do not think it would be covered…
in addition to the kit are any additional parts required?
Thank in advance
Hi Bill, I will be sure to send a copy of the tech bulletin to your email. Let us know if there is any part we can offer you to fix this issue!
My 2016 GMC Duramax LML 2500HD pump just failed and I am dealing with the extended warrenty now. Could you please send me the tech bulletin on this CP4 problem, Thank You.
Hello Kenny, I have sent it your way. Let me know if you need any other assistance. Thank you.
i need to know if you can send me that info i also have the problem
Hi Leonard, I have just sent a copy of the bulletin to your email. let us know if we can help you source the parts you will need!
Please send me the tech bulletin for this issue. We just experienced this catastrophic situation with our 2011 Duramax and are in the process of having a full fuel system overhaul.
Hi Tamara,
We have emailed you a copy of the article. Please feel free to reach out to us if you need any help with replacement parts. Thanks!
What’s sad is I have a 2018 2500 HD with 53k miles and the fuel pump did the same thing as described here. Luckily the HD warranty is covering it at dealer – hopefully all the work is accomplished as required – at thier mercy.
Hello Alan, If things don’t work out with the dealership you may want to consider a CP3 Conversion kit. We have them ready to ship. Thanks for the comment.
Hi, Could you please send me a copy of the tech bulletin. My 2014 drama with 52,000 miles is cranking extra long before starting and I fear this may be the problem.
Hello Scott, I emailed you the requested tech bulletin. If we could be of any further assistance please let us know!
Hi Greg,
I think I may have missed your email or it may have gone to my Spam folder. Let’s try another email address. Thanks. By the way, the diagnosis on the long crank time was a cracked fuel filter housing. Had that, the filter and sensor replaced. Not sure if that is related at all.
Hi Scott, I am more than happy to send another copy of the bulletin to another email. What is the other email address you’d like us to send it to?
Please send it to hirdo1960@gmail.com. Thank you!
Hello I would like a copy of the tech bulletin thanks in advance
I have a 2016 3500 with 60,000 miles have been using XPD fuel treatment since new
No problems yet. Do you know if the 2016s came with the CP4.2 pumps ?
LK
Hello LK, I have emailed you a copy of the bulletin. Let me know if you need anything else.
I am scheduled for a fuel pump replacement (hopefully before it fails) on my 2015 Duramax 2500. I would appreciate the tech bulletin others have requested.
Thank you for your assistance
Hello Carl, thank you for reaching out to us. I just emailed you over the requested tech bulletin. Please let me know if you need and further assistance. Jacob
Hello, can you please send me a copy of the bulletin. I have a 2011 GMC 2500 durmax having these issues since early December. Intermittent starts. I replaced the primer pump, new fuel filter and water sensor. Thank you
Hi David, I have just sent a copy to your email address. Let me know if we can help you source any of the parts you will need!
Hey Greg, Any chance I could get emailed a bulletin on the 2015 CP4 pump and system? I’m thinking I’m looking at the repair unfortunately..
Thank you, Aaron
Hi Aaron,
We have emailed you a copy of the article. Please feel free to reach out to us if you need any help with replacement parts. Thanks!
Just found out today about cp4. 2016 duramax went out with family in it going out of town for the weekend on freeway. My gas filter went to 0. Anway, please send me bulletin. I have to replace cp4 with 120000 miles
Hello,
Thanks for reaching out to us. I have emailed a copy of the bulletin. Let me know if you need anything to get your truck repaired.Thank you.
Greg
2015 Duramax and started throwing the P0191 code but is running fine but have a rubbing noise that I believe is the pump going. Can you please send me the bulletin as well ? I have not looked at my paperwork yet, but to what level does GM warranty this (i.e Milage, age)…if any? Thank you !
Hello,
Thanks for reaching out to us. I have emailed a copy of the bulletin. Let me know if you need anything to get your truck repaired.Thank you.
Greg
My 2016 LML injector pump just failed at 88,000 miles. Truck is at dealer. They are “negotiating” with me. They started at $14,400, and they are now down to $7,500. Any bulletin you have is appreciated. I did everything they recommended, and it still failed.
Hi Mary – I’ve sent that over via email for you. Please let us know if you need anything else.
My 2015 2500 just died on me on the interstate yesterday and it is showing the codes that my pump is bad can you send me that bulletin also as
I am calling GM in the morning not that it will do me any good as my truck has 120,000 on it and it’s a 2015 but I’m going to see why they didn’t
Notify there customers about this issue so we could address it before it cost us thousands of dollars to fix it
Hello John,
We have emailed you a copy of the article. Please feel free to reach out to us if you need any help with replacement parts. Thanks!
Just had my 2015 duramax take a dump on me can you send me the bulletin also my truck has about 120000 on it
Going to call GM in the morning but doubt they will do anything about it
Good morning, recently purchased a 2015 GMC 3500, and finding out about this CP4 issue has me a bit concerned. I see folks are asking about a service bulletin or other info you have collected about this. Would you be kind enough to send me a copy of that info please?
Hello Rob, I will send a copy of that bulletin to your email. Thanks, Jacob
my cp 4 pump went out on 10/24/2023 with no warning at all. 2016 Chevrolet 3500 HD Duramax. I have never received a bulletin on this big problem nor has my dealership talked to me about this. Very frustrating to have a powerhouse truck and GM installs a POS fuel pump in. Now, I have a $13,700.00 bill to replace the fuel system. THIS IS NOT RIGHT!!!
Hello David,
We have emailed you a copy of the article. Please feel free to reach out to us if you need any help with replacement parts. Thanks!
Just had the pump crap the bed in California. I’m from BC. 2016 3500 GM won’t help whatsoever. What a joke when they knew the pump wasn’t up to snuff
Now I’m replacing the fuel system and doing a cp3 conversion thanks to injectors direct all in one kit. Hope I can get home soon.
I am interested in purchasing a 2015 Duramax with 219k miles. I found this bulletin and now I am having 2nd thoughts. Do you feel like the system would have already failed on a vehicle with this many miles on it and is the replacement pump better than the 1st? Any opinion is helpful. Thank you in advance.
Can you please send me the bulletin for the 2015 Duramax CP4 issue. We just had the same issue as others listed above.
Hello Kayla,
We have emailed you a copy of the article. Please feel free to reach out to us if you need any help with replacement parts. Thanks!
Same issue. 2015 GMC Sierra 3500HD Duramax failed. Dealer wants at least $12K for fuel system replacement (says pump is $5K). Can I get tech bulletin? Should I buy kit and have a different mechanic do replacement?
Hello Mike,
Thanks for reaching out to us. I have emailed a copy of the bulletin. Let me know if you need anything to get your truck repaired.Thank you.