Had a catastrophic fuel pump failure in our 2015 GMC Sierra Denali 2500HD Diesel......lost all power steering, brakes, etc. Dealer wants $12000 to repair! When the pump fails, metal shavings go thru entire fuel line, etcAfter researching online, GM knew about this (CP4 fuel pump) issue before we bought our new truck in 2015!We were lucky this happened at our seasonal campground & not while towing our 5th wheel in traffic.Posting this as a warning to all of you with a GM diesel 2011-2016

I would contact GM. They've been pretty fair on most of the CP4 pump failures from what I've seen. This is why the CP4 pump sucks. It probably isn't likely to go on any given truck, but if you're unlucky and it does on yours have a really big problem.

It’s a long shot but you can ask your local dealer if they can use some their goodwill warranty money to help you out. Rarely covers everything but sometimes you can get them to cover parts.I’m also betting there is an aftermarket filter one can add to the output side of the pump to protect everything downstream.

Ford 6.7 Diesels use the same pump. I've read the horror stories about the CP4 on the Ford diesel forums. $12K is not out of line to repair the damage caused by this pump when it fails catastrophically. You have my sincere sympathy. I cross my fingers that it never happens to me.

There were no 200 BAR (2,900 PSI) rated filters found during the original thread on CP4 failures...learned a ton about the Bosch CP4 diesel injection system on this forum

2015 GMC Sierra Denali-catastrophic fuel pump failure

Flashman
Explorer II
Jun 29, 2019
SpeakEasy wrote:
rhagfo wrote:
reelcamper1 wrote:
No extended warranty, not covered on drivetrain! Thanks for all the info....still trying to get them to pay for costs! Going to try the suggestion for "goodwill warranty" money as suggested

Interesting that the fuel system is not covered under drivetrain warranty?

Not to hijack the thread, but...

I was going to buy a Ford extended warranty until I read that any part that failed as a result of a failure of a covered part was NOT COVERED. I suppose that sort of thing is standard fare in the warranty world. I declined the purchase.

-Speak

Don't worry - Fords got your back.
Grit_dog
Navigator
Jun 29, 2019
Ha, and I asked them to put new shocks on it while it was out if commission.
They quoted me $1300+ for 4 shocks! Fcking amazing. Needless to say they didn't get to do the shocks.....
Grit_dog
Navigator
Jun 29, 2019
Great news you got the truck back fixed and covered under warranty.
But your story rings sooo true as to the absolute incompetence or maybe red tape, not sure which that is present.
Heck I don't even own one of those trucks, but a couple hours of google ing and a week waiting for parts ordered and couple days in the garage with a case of beer and I could have fixed it at home. Yet your dealer took a month...
Similar story, my 2016 Chevy work truck had a trans issue. Short story, it was covered under warranty and fixed.
Long story is they gave it back to me after a month, NOT fixed and somehow I might not notice that it slip out of gear and into neutral every time you come to a stop, lol.
After 2 months total, 3 attempts to fix it and 2 different loaner trucks because I put so many miles on the first one they swapped me into another new truck so they could sell the first loaner, I got the truck back.....and put about 9 k miles on their loaner trucks.
No wonder vehicles are so expensive. They could have rebuilt or swapped the trans for a new or rebuilt unit the first time, in about a week.
This faux pas literally cost GM $thousands in additional costs and depreciation.
reelcamper1
Explorer
Jun 29, 2019
GREAT NEWS!!! Just picked up our 2015 GMC Denali truck today! Took 1 month for dealer to repair because GM did not know which pump to replace failed Bosch pump.....
100% covered under drive train warranty!!! Dealer says he they repair these all the time!
Lessons learned: GM Customer Care is an outsourced, 3rd party vendor....they just refer back to the dealer (which in our case, dealer #1 didn't want to cover repair)
Don't give up, just because dealer said repair wasn't covered!
Thanks to everyone for input and support! We are lucky we were NOT towing trailer at time of pump failure!
Huntindog
Explorer
Jun 10, 2019
Umm, they don't need any. Winning such lawsuit is another matter. But such a lawsuit can still be a problem for the defendant.
Bionic Man wrote:
BenK wrote:
Suggest writing an open letter in all of your news media that the "Good" dealer is within...name them

Too many OEM's are behind the times and don't GET how the Internet and social media plays VERY large in their credibility

Just don't name the offending dealership...they have been known to sue when named...

Glad you have a great dealership and on the way to a satisfactory end

What grounds would they have to sue?
Bionic_Man
Explorer
Jun 10, 2019
BenK wrote:
Suggest writing an open letter in all of your news media that the "Good" dealer is within...name them

Too many OEM's are behind the times and don't GET how the Internet and social media plays VERY large in their credibility

Just don't name the offending dealership...they have been known to sue when named...

Glad you have a great dealership and on the way to a satisfactory end

What grounds would they have to sue?
blofgren
Explorer
Jun 10, 2019
Glad to hear that you are getting it covered under warranty! :B
FishOnOne
Nomad
Jun 09, 2019
Goes to show you how a dealer can make a difference.

Dealer #1/GM customer service: Charge customer for repair.
Dealer #2: Cover repair under warranty.

Hope the OP doesn't have another HPFP repair down the road.
BenK
Explorer
Jun 06, 2019
Suggest writing an open letter in all of your news media that the "Good" dealer is within...name them

Too many OEM's are behind the times and don't GET how the Internet and social media plays VERY large in their credibility

Just don't name the offending dealership...they have been known to sue when named...

Glad you have a great dealership and on the way to a satisfactory end
Lantley
Nomad
Jun 06, 2019
reelcamper1 wrote:
Purchased truck from a GMC dealer in Joliet, IL, but we have taken truck in for service, oil changes, etc. to a dealer closer to home. When the truck DIED, hubby was 1 hr away from home. Closest dealer was GM dealer in Morris, IL (also owned by dealer where we purchased). They REFUSED to cover under warranty! Told us it was NOT covered by warranty. This was same thing we heard, from numerous people at dealer, GM Cust Service, GM Cust Service Supervisor, GM rep at Dealer, etc. etc. They were willing to give us "goodwill Warranty money" and charge us around $5500......
UNACCEPTABLE TO US!

So we had truck towed to the dealer we ALWAYS have service. They called their GM rep & are covering this under our warranty!

After all is said and done, I am sending all dealers & GM a letter. This should not have been this frustrating!

You were caught in some sort of politics and profit loss scenario sort of like what happens in the RV industry. The other dealers did not want a reduced rate for their labor and all that goes with warranty work vs. a straight sale.
Your regular dealer values you as a customer and went to bat for you and is willing to accept the shortcomings of doing warranty work.
I understand there are warranty challenges for the dealers but this should be all transparent to the customer.
GM initially dropped the ball on this, but fortunately your regular dealer got involved and picked up the fumble.
Good Luck..all's well that ends well.

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2015 GMC Sierra Denali-catastrophic fuel pump failure

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