Duramax Diesels Forum Truck of the Week
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Old 08-13-2019, 05:55 AM
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Default CP4 class action lawsuit against GM

Not sure if this has already been posted, but just saw that there is a class action lawsuit against GM for the CP4 failures.

https://dieselprogress.com/more-lega...-diesel-28292/
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Old 08-13-2019, 07:00 AM
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Yeah, I'm sure that'll go far....
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Old 08-13-2019, 08:50 AM
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I believe they tried this with the common rail TDI with their far higher failure rates and, if I'm not mistaken, basically got nowhere

There is a thread over on TDIclub with hundreds, if not thousands of users that have had failures, including mine.

One thing to keep in mind is Bosch was the manufacturer of the pump and not GM. And they have made several changes or improvements if you will that seems to have reduced the failure rates. The TDI has been using them for several years before the Duramax.
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Old 08-13-2019, 09:12 AM
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Quote:
Originally Posted by 2004LB7 View Post
I believe they tried this with the common rail TDI with their far higher failure rates and, if I'm not mistaken, basically got nowhere

There is a thread over on TDIclub with hundreds, if not thousands of users that have had failures, including mine.

One thing to keep in mind is Bosch was the manufacturer of the pump and not GM. And they have made several changes or improvements if you will that seems to have reduced the failure rates. The TDI has been using them for several years before the Duramax.
While Bosch is the supplier/manufacturer of the pump GM chose to use it and put it into a production application. What blows my mind is CP4 failures are much less common on the 6.7 ford platform what what I've seen on social media.
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Old 08-13-2019, 09:44 AM
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Quote:
Originally Posted by Bdsankey View Post
While Bosch is the supplier/manufacturer of the pump GM chose to use it and put it into a production application. What blows my mind is CP4 failures are much less common on the 6.7 ford platform what what I've seen on social media.
Yeah, I was not trying to say they are off the hook but they are the ones who told GM that this pump was appropriate for this application and and was good for so many miles/hours, etc. In this application bosch is the material expert. So GM in turn would counter sue Bosch. I guess in the end, if enough pressure was put on them, it would likely be something like the LB7 injector debacle. Improved design, longer warranty, etc.

If either party can show (prove) they are actively working on the situation and taking care of the customers then a class action suit will almost never materialize

As for the ford, I wander if it is due to better filtration. These CP4s are very suspectable to contamination and lack of lubrication. Since they run on the same diesel we do, and I doubt they are more diligent in use of additives, then this leaves filtration.

Supposedly they also have a lift pump, and some have claimed it was the reason for the lower failure rates. But it doesn't explain why the cp4 in the TDI failed so much when they have lift pumps too.
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Old 08-13-2019, 01:51 PM
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Just add a lubricant and or run lift pump, no air in a positive pressure system...
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Old 08-13-2019, 01:59 PM
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Doesn't matter as only the lawyers will win. They will get millions and us poor guys will get a free lube and oil.
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Old 08-13-2019, 04:38 PM
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Quote:
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Doesn't matter as only the lawyers will win. They will get millions and us poor guys will get a free lube and oil.
Yup, usually 5 bucks per person and the firm gets millions.
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Old 08-13-2019, 05:03 PM
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Thats a pretty good payout. I was hoping for at least $4 but would settle for $3
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Old 08-13-2019, 07:56 PM
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Fords fail just as often. I’ve personally had more Ford fuel system failures come through the shop than GM.
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Old 08-15-2019, 10:31 PM
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Quote:
Originally Posted by JoshH View Post
Fords fail just as often. Iíve personally had more Ford fuel system failures come through the shop than GM.


Thatís pretty surprising to me. Everyone I talk to that works on diesels says the fords ainít failing as often.


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Old 08-16-2019, 08:11 AM
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VW CP4 style pumps die early too. They are a crap design. Maybe the latest revisions will be better.

Denso was in front of Bosch on common rail by at least 2 years. GM had to switch. The LB7 injector fiasco was just horrible.

In the end it comes down to tailpipe regulations. We needed too much pressure and complexity to achieve them. We also need clean air. So .....Im hoping the newest tech will get us there with more reliability.
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