Yeah they still fail. With anything maintenance plays a big part. They also have two separate filters vs the Duramax single.
LML CP4 Problems
- Thread starter Janimal444
- Start date
Yeah they still fail. With anything maintenance plays a big part. They also have two separate filters vs the Duramax single.
You have an account with them to get that price?
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I believe you would be right, but I think that was part of the problem. On some trucks the problem couldn't be tuned out.
Would need to hear from someone who encountered it directly I guess.
My thoughts on the best route would be to throw on a lift pump and the new fangled bypass when it comes available and try to make it live off warranty this way.
the rail surge is what is the draw back to a cp3 swap it can be tuned out but some trucks take a looootttt of tweaks.
With the strides exergy has made on cp4s I would just do a stroker cp4 and call it a day.
With the strides exergy has made on cp4s I would just do a stroker cp4 and call it a day.
There's nothing on their site for info.
I wonder what sort of improvements they are making to help these things last?
hi new member . i have a 2016 duramax 74k miles 2nd owner. i bought from dealership at 19k miles. my cp4 just went out ruined the whole fuel system. chevy is saying warranty doesnt cover it. my warranty book says truck has 5yr/100000 powertrain. one dealership says its 5yr/50000.any help would be thankful. i cant afford 10k for this repair..
From here: https://www.chevrolet.com/important-information
"Every 2016/2017 2500/3500 series Heavy Duty (HD) Silverado Pickup equipped with a 6.6L Duramax Turbo-Diesel Engine comes with a 5-year/100,000-mile Limited Powertrain Warranty and 5-year/100,000-mile 24/7 Roadside Assistance Program and Courtesy Transportation Programs."
"Every 2016/2017 2500/3500 series Heavy Duty (HD) Silverado Pickup equipped with a 6.6L Duramax Turbo-Diesel Engine comes with a 5-year/100,000-mile Limited Powertrain Warranty and 5-year/100,000-mile 24/7 Roadside Assistance Program and Courtesy Transportation Programs."
after talking to chevrolet directly multiple times they some what agreed the cp4 is covered.Then talking to my nearest dealership back in fourth for hours. They kept saying just bring it in and let us look at it. My response was its a simplke question is the cp4 covered. After debating forever i was finally told its covered and to tow it in.ill keep yall posted on what happens.My next question for you folks what should i do to prevent this again. cp3 swap is not a option for about a year.
100% stock. He purchased used and the pump went a week later. He’s been a long time customer, we just hadn’t got to the goods on this truck yet.