2015 GMC Sierra 2500 fuel system problems

Filed Jul 10, 2025 · Fuel system · 129,000 miles · CA

The contact owns a 2015 GMC Sierra 2500. The contact stated while driving at an undisclosed speed, the vehicle lost automotive power and stalled. No warning lights was illuminated. The vehicle was taken to an independent mechanic where it was diagnosed that the Fuel Pump Module needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 129,000.

Filed Nov 21, 2023 · Fuel system · IA

Truck has a CP4 injection pump and they go bad and cost $15,000-$20,000 to repair and if that happens I owe money on the truck and would have to get a loan or figure something out and still have to make a payment on something I can’t even drive! They need to recall it and swap them out to a CP3 and be done with it. Why wait until it cost 10s of thousands of dollars when they can get it done for $3,500 at the most?

Filed Jul 12, 2023 · Engine, Fuel system · IN

While driving down the highway at 60 mph, the truck stumbled then completely died. After coasting to a stop truck would not restart. Towed to a repair shop to find out the Bosch CP 4 fuel pump exploded and contaminated the whole fuel system with metal shavings. A very expensive and lengthy repair. GM has known there is issues with these parts, but has failed to recall and fails to cover repair costs. Other manufacturers using the same part have issued recalls. While I was able to safely the get vehicle to the side of the road, the failure could’ve resulted in an accident causing personal injury or property damage.

Filed Dec 14, 2022 · Fuel system · 136,000 miles · CA

The contact owns a 2015 GMC Sierra 2500. The contact stated while her husband was driving approximately 20 MPH, the vehicle lost motive power and stalled. The vehicle lost power steering and power braking functionality. The contact stated that her husband did not see any warning lights being illuminated. The contact stated that her husband pulled over and stopped the vehicle. The vehicle could not be restarted. The contact stated that her husband purchased a fuel head for the diesel engine. The fuel head was replaced, the vehicle was started, and ran for less than a minute when the contact heard loosened nuts and bolts coming from the engine compartment. The vehicle stalled and was towed to an independent mechanic. The vehicle was diagnosed, and it was determined that the CP4 had to be replaced with a CP3 Conversion (Part 10904), fuel pump module assembly (Part N10021) and a Duramax Conversion kit (Part 10904). The vehicle had not been repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 136,000.

Filed Aug 16, 2022 · Fuel system · TX

While driving to work with my workers and I on HWY going 70 mph pickup just turned off on me and no longer started up. Took to Mechanic and said it was the Bosch CP4 failure. Metal debris flooded our entire high-pressure fuel system. Had to get replacement of fuel lines, fuel rails, pump and injectors and the removal/flushing of the fuel tank. Our total repair is over $12,000. which we don't have. Mechanic just finished repairing it after 11 month's but we don't have the $ to get it out from shop.

Filed Dec 8, 2021 · Fuel system · LA

While exiting off ramp of the interstate my truck just completely shut down. After several towing bills to different mechanics to verify the problem, it was the cp4 pump system ! Over $13000 in repairs , towing , and rental fees

Filed Apr 23, 2021 · Fuel system · 145,000 miles · LA

Driving down the interstate and my change fuel filter light came , and within 20 minutes truck went into limp mode. Pulled over and changed fuel filter but didn't fix the issue. Truck is currently at dealership waiting to find out diagnosis

Filed Feb 10, 2021 · Fuel system · 118,273 miles · CA

2015 gmc sierra 2500 duramax driving east with the flow of traffic on 80 reaching the summit towards tahoe. We suddenly experience at "change fuel filter" warning which only lasted approximately 20 seconds before the message then read "derating". Upon this second notification we immediately lost power to the engine which resulted in reduced braking capability and steering at literally the top of the mountain. We were traveling in snowy conditions with many semi trucks around us. We tried to safely drift to the shoulder to the safest possible place. The sudden lack of power left my family, including 3 children, in a very dangerous position. We ended up being stranded with tow trucks being very scarce and challenging to find. The nearest rental car took 2 hours to get to, and we had to shuffle kids all over. One child was crying and scared to death at all the cars zooming by and our inability to move. It appears that the cp4 fuel pump may have failed leaving us almost instantaneously in an unsafe situation.

Filed Aug 27, 2019 · Fuel system · 102,040 miles · MT

The cp4 fuel pump imploded and sent metal shards through my vehicles entire fuel system

Filed Dec 3, 2018 · Engine, Fuel system · 74,000 miles · PA

Duramax diesel engine fuel injection pump broke with no notice while driving causing a total loss of power. Failure repair under warranty required replacement of pump, injectors, lines, filters and flush of fuel tank.