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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 11-02-2016, 01:33 AM   #91 (permalink)
Glow Plug
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Join Date: Feb 2010
Posts: 260
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My 2011 has been having issues for a year and a half... And it finally died. Had a shop check the FPR for metal, and there was some... Wouldn't start afterwards.

11 days out of warranty, and 300km out of extended warranty.

The up shot, is that GM does warranty CP4 failures, even with a tuned truck.... But they don't back date, lol.

A lift pump with filters will help it last longer... Which, depending on the age of your vehicle, can be worse.

CP3 conversion is the way to go. Stock LBZ pumps are fairly affordable, compared to modded pumps.

2011 Crew Cab Denali DRW
468.4 @3050 RPM and 849.8 ft-lbs @ 2800 RPM

Last edited by drperry; 11-02-2016 at 01:35 AM.
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Old 06-27-2019, 11:07 PM   #92 (permalink)
Sparkplug Hunter
Join Date: Jun 2019
Location: Longview Texas
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Bought my Duramax a year age not knowing of the CP4 failures. Since hearing about the problem I have read that the best way to help the pump is to buy from a reputable station, change your fuel filter at no less than 20%, put fuel additive in every fill up to increase lubricity. I chose OPTI Lube. Last you can add a lift pump or do the CP3 conversion. Any thoughts?

2016 LTZ Duramax LML Engine
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