2016 GMC Sierra 2500 Fuel system Problems

CP4 injection pump failure while driving nearly causing vehicle collision.

NHTSA ID

11677925

Incident

Aug 1, 2025

The CP4 pump failed while driving causing vehicle to stall. Upon failure, lost power to steering. Luckily we were on an access road for a rest area and not yet on the interstate. This resulted in a 14.5 thousand repair. No prior warning to pump failure. GM has recently settled a class action related to this pumps failure and has never recalled trucks with this pump to avoid failure.

NHTSA ID

11668022

Incident

Jun 5, 2025

My vehicles High Pressure Fuel Pump failed causing the vehicle to shutoff while driving. In addition, due to the engine shutting down while driving, the power steering quit working causing me to not be able to steer the vehicle. Thank you

NHTSA ID

11666095

Incident

Jun 6, 2025

My 2016 GMC Sierra 2500 with a 6.6-liter Duramax diesel V8 engine suffered a complete engine shutdown—an issue that is both hazardous and expensive to repair. Fortunately, mine failed in a parking lot. No warning lights or symptoms were present. Failure is instantaneous and can occur any time rendering the vehicle inoperable on high-speed highways, Intersections, etc. Failure always leaves vehicle occupants stranded, creating an unsafe and dangerous situation. My vehicle was towed to a GMC dealer. Repair costs could be as high as $15,000. The 6.6-liter Duramax diesel V8 engine is equipped with a Bosch ‘CP4’ high-pressure fuel pump. These pumps are unreasonably fragile and prone to catastrophic failure causing instant contamination of the entire fuel system with metal shavings. General Motors has agreed to pay $35 million to settle with owners following a class action lawsuit that accused the company of installing defective Bosch CP4 high-pressure fuel pumps in certain Chevrolet and GMC pickup models. This action covered only owners in California, Florida, Illinois, Iowa, New York, Pennsylvania, or Texas.

NHTSA ID

11660921

Incident

Apr 22, 2025

Motor stopped dead while driving on a local Interstate Hwy. Was able to negotiate the truck out of traffic without crashing. Not an easy thing to do in speeding rush hour traffic. Had the truck towed to a reputable repair shop and discovered the CP4 fuel pump had failed and shattered throughout the fuel system. Repairs in the amount of $13,520.30 incurred to get the truck back in service. The attached invoice includes $167.87 for other maintenance not related to the CP4 fuel pump repair. This is a known problem and safely hazard. A class action suit settlement is related to the CP4 fuel pump against multiple truck manufacturers. # [XXX] and can be found at [XXX] . Minnesota is not included in the class action and GM will not address my complaint. Why has this KNOWN safety issue not resulted in a recall? INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11658680

Incident

Feb 27, 2025

My high pressure fuel pump, cp4, went out with no warning while driving causing me to lose power. Was able to bring truck to stop safely but was stuck in middle of roadway.

NHTSA ID

11610634

Incident

Aug 22, 2024

The contact owns a 2016 GMC Sierra 2500. The contact stated that while stopped at a stop sign, an alert of "50% fuel range remaining" message appeared on the instrument panel. The contact stated afterwards while attempting to make a right turn the vehicle stalled and failed to restart. The contact had the vehicle towed to an independent mechanic who advised contact the fuel pump needed to be replaced due to metal fragments entering the oil tank. The manufacturer was not made aware of the failure. The vehicle was not repaired. The failure mileage was unknown.

NHTSA ID

11590577

Incident

May 24, 2024

Fuel system failure

NHTSA ID

11533481

Incident

May 24, 2023

The contact owns a 2016 GMC Sierra 2500. The contact stated while driving 70 MPH, the vehicle lost motive power and stalled inadvertently, almost causing a crash. There was no warning light illuminated. The contact stated that she was able to veer to the side of the road by dodging traffic. The vehicle failed to restart. The vehicle was towed to the dealer where it was diagnosed that the high-pressure fuel pump had exploded and projected metal fragments throughout the high-pressure fuel system. The vehicle was repaired at the owner’s expense. The manufacturer was notified of the failure and informed the contact that a partial reimbursement would be made. The failure mileage was approximately 114,000.

NHTSA ID

11495766

Incident

Sep 7, 2022

Mileage

114,000 mi

While Pulling 35' 5th Wheel down freeway, a message appeared in instrument panel telling me the fuel filter was at 0 percent and was going into low power mode. There happend to be an offramp there that I was able to get off the freeway. While making the turn on the offramp the truck died. I pulled over as far as i could whie coasting with no power steering or brakes, leaving truck & trailer partially blocking the offramp. Unable to start the vehicle, I Immediatly contacted Onstar and they dispatched the CHP & tow truck. When CHP arrived he asked when tow truck would be there. Without being able to confirm exactly, and due to safety concerns because of blocking the offramp, he called his own tow truck (Rons Towing) and forced me to move vehicle to safe location. The issue ended up being the injector fuel pump (CP4) that GM was well aware of going out and sending metal fragments throughout the fuel system. I've been told the pump was made in China and not to GM standards. The vehicle has been repaired, all work was covered under extended warrenty, This all could have been avoided if GM would have replaced the faulty fuel pump under recall. Had this happened 100 miles further on our trip we would have been going over Pacheco Pass in Calif. Could have been a total disaster had we been going down the other side with No Power Steering & No Power Brakes pulling a 12,000 lb Trailer in the Dark.

NHTSA ID

11493553

Incident

Oct 10, 2022

Engine stalled due to fuel pump failure. Dealer had to replace entire fuel system

NHTSA ID

11464713

Incident

Feb 21, 2022

TL* THE CONTACT OWNS A 2016 GMC SIERRA 2500. WHILE DRIVING APPROXIMATELY 15 MPH, THE ENGINE STALLED WITHOUT WARNING. THE VEHICLE WAS TOWED TO A DEALER WHERE IT WAS DIAGNOSED THAT THE FUEL INJECTOR PUMP FAILED AND NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED. THE MANUFACTURER WAS INFORMED OF THE FAILURE. THE VIN WAS UNKNOWN. THE APPROXIMATE FAILURE MILEAGE WAS 11,000.

NHTSA ID

10937972

Incident

Nov 27, 2016

Mileage

11,000 mi