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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, 02:33 AM   #91 (permalink)
drperry
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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.

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Last edited by drperry; 11-02-2016 at 02:35 AM.
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Old 06-28-2019, 12:07 AM   #92 (permalink)
gbrent
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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?

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Old 09-13-2019, 12:43 PM   #93 (permalink)
Langford
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I have a 2011 duramax 3500hd and the bomb went off on me change it before you have to replace the whole fuel injectors fuel lines to drop tank to clean cost me 7000.00
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Old 09-15-2019, 11:20 AM   #94 (permalink)
Cperk
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Get the better fuel pressure regulator and screen. It will catch all the metal before it leaves the regulator on the hpfp. Just have to change the pump then. The factory screen isnít fine enough plus they are known to let go and even larger particles get by.


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Old 09-17-2019, 01:34 PM   #95 (permalink)
SRex
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Can you tell me more about the said screen. Part numbers, etc. Thanks!!
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Old 09-17-2019, 02:17 PM   #96 (permalink)
Toolbox58
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Quote:
Originally Posted by SRex View Post
Can you tell me more about the said screen. Part numbers, etc. Thanks!!


Itís the Exergy System Saver. Some report you have to take a lot off of the motor to install. I didnt and had never done it before. It took less than an hour for me to change it. You will need a 6Ē T25 Tory bit to reach it. Itís the only bit that will reach the two screws on the base. You have to take the 4 bolts out of the air conditioner compressor base and set it aside to reach down to it. Be sure to blow the FRP off and around it, before you take it loose. You do not want any debris to get into the fuel system. Hereís a link to it.
https://www.wcfab.com/i-31420523-exe...fca-mprop.html


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2015.5 Chevrolet 3500HD CC DRW 6.6 LML 108,000 miles Bought with 98,000 miles
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Old 09-17-2019, 07:33 PM   #97 (permalink)
lynn1130
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Without trying to read through 9 pages of CP4 talk, has anyone joined the lawsuit? I have contacted a firm out of Texas and have the contract to join but I can find now real information on what direction this has gone, what GM is doing if anything and on top of that the firms fees are contingency but 40% of recovery. Some say that is about normal but it seems high to me but then I am cheap.
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Old 09-19-2019, 04:16 PM   #98 (permalink)
Colorocko
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Back in November 2018 I joined the class action lawsuit with HMG (Hillard Martinez Gonzales)
Form I filled out.

https://giliad.secure.force.com/Form...stForm?h=SZNQI

Not sure if they are needing additional CP4 failures
You can conntact them at (877) 433-1996.
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Old 10-18-2019, 02:54 PM   #99 (permalink)
rubix
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I have a 2014 LML totally stock, 56k, 5 months out of warranty and my CP-4 just failed. GM will only cover 45%. Total bull****. My 05 is still driving around no problems. My buddy's 2015 with 77k just failed in the same week. I'm a die hard GM guy for 30 years but f*^k them for not making it right. I drive like a grandma and take meticulous care. That CP-4 is a weak link time bomb that should be recalled.
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Last edited by OkDually; 10-18-2019 at 03:12 PM. Reason: sig
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Old 10-19-2019, 10:45 PM   #100 (permalink)
rob1
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I know it’s an expensive failure, and very upsetting if you’re unlucky enough to have it happen to you, but I can assure you it’s not as common as you would think. You need to keep in mind, the posts on forums like this one are only from (rightly) upset owners. I’m sure that the failure percentage is actually lower than the internet would like you to believe.

On another note, I personally hope there is no special policy or campaign regarding the injection pump, if there is I’ll not be able to afford to feed my family anymore, the labor time was cut by more than in half for the injection pump replacement, and the procedure we have to follow if the pump fails with metal debris in the system, we get just over 12 hours to do a repair that to do correctly can take nearly 25 hours.

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