Talking someone at GM that has a brain and authority - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 30 (permalink) Old 07-30-2019, 04:00 PM Thread Starter
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Talking someone at GM that has a brain and authority

Does anyone have a phone number or know how to get in touch with someone at gm that can make decisions my cp4 went out I have tried calling the gmc customer care number this peoe aren't even in the USA how sad I was supposed to receive a call from someone last week and still haven't received a callback I really think it's sad that an American company like this has moved there customer service off shore they need to take a lesson from Mercedes Benz USA I can call there Corp office and speak with people that are in the usa and have knowledge and authority

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post #2 of 30 (permalink) Old 07-30-2019, 04:07 PM
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Is it under warranty?
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post #3 of 30 (permalink) Old 07-30-2019, 06:03 PM
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Damn man I hate to hear that. If you need a CP4 for cheap I just removed mine at 23k miles you can scoop up.

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post #4 of 30 (permalink) Old 07-30-2019, 07:50 PM
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CP4 is prone to going bad from lack of lube try 888-988-7267

To many vehicles to little time! New LP5 owner first 2017 GMC Denali Duramax
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post #5 of 30 (permalink) Old 07-31-2019, 10:15 AM
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The dealer can contact Corporate for you and start a review, if under warranty. The problem is, finding a good dealer. The CP4 is a known issue, so GM can’t act dumb. The Ford 6.7 uses the same IP, but since they have a lift pump the failures are not as common, and they can modify the CP4 so when it fails it doesn’t take out the injectors. Don’t know if that same modification will work on the LML’s. You can go with the Cp3 conversion, or stay with the Cp4 and add a lift pump. The CP3 would be better. Regardless you’re looking at over 10k to fix
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post #6 of 30 (permalink) Old 07-31-2019, 12:06 PM
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Originally Posted by monkeyman View Post
CP4 is prone to going bad from lack of lube try 888-988-7267
================================
If that were true, the folks in here who have had CP4 failures in spite of "doing all the right things" didn't have them.

Maybe you can convince them that lube is the answer, and because they used a lube they didn't really have the dreaded CP4 failure.

As a side-note, I personally have been using a lube since I got mine at 70,000 mi - now approaching 81,000 mi - not about to drive that thing one block further, except for trip to the shop for the CP3 installation.

My CP3 conversion kit from S & S came last night. That was about $2,100. My local GM dealer has quoted me approx. $1,500. to install - I am sched. for next Monday-Tues.

Last edited by 6686L; 07-31-2019 at 12:16 PM. Reason: dont mix asparagus with sour cream
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post #7 of 30 (permalink) Old 07-31-2019, 12:18 PM
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Originally Posted by Gatordog View Post
T..... The CP4 is a known issue, so GM canít act dumb..... You can go with the Cp3 conversion, or stay with the Cp4 and add a lift pump. The CP3 would be better. Regardless youíre looking at over 10k to fix
==========================================
A "lift pump" is the answer to the CP4 failure problem? Anybody have any statistics on that ? Anyone know of a CP4 "gernading" on a Duramax equipped with a lift pump?
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post #8 of 30 (permalink) Old 07-31-2019, 01:31 PM Thread Starter
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Is it under warranty?
No its a 2012 with 75830 miles

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post #9 of 30 (permalink) Old 07-31-2019, 01:32 PM Thread Starter
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Damn man I hate to hear that. If you need a CP4 for cheap I just removed mine at 23k miles you can scoop up.
Its at the dealer supposed to start repair today. It went out on 7/13/19

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post #10 of 30 (permalink) Old 07-31-2019, 01:33 PM Thread Starter
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CP4 is prone to going bad from lack of lube try 888-988-7267
I know this and all about the cp4 issues

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