GMC Sierra 1500

After driving my vehicle for a short period of time I stopped to go shopping. When I returned to my vehicle I started it as usual and the check engine light illuminated. I began driving and within 0.25 miles I received an info enter message that stated my vehicle would have reduced acceleration and to please drive safely. My engine fans became noticeably louder and ran the entire trip home (about 15 minutes). After pulling into my driveway I sat in the vehicle and listen to the fans continue…

In normal operation on Tuesday May 26,2026, the engine experienced catastrophic failure. The engine is the GM L87 6.2 Liter. This was on a highway in the country and I was able to maneuver the truck off the road before an accident occurred. It did leave me stranded and I was required to get it towed on a roll off (It was not drivable) to the dealer where I purchased it. The dealer [XXX] ) inspected my truck and has informed me that the issues with my 2025 Sierra match the issues for the…

My truck has completely shut down/ loss power on several occasions. Happened when I was l slowing down or completely stopped. Everything goes dark. Had to wait several minutes before truck would start.

The contact owns a 2016 GMC Sierra. The contact stated that she had noticed the frame had rusted in two places. No warning lights were illuminated. The local dealer was contacted, who confirmed there were no open recalls. The vehicle was not diagnosed or repaired. The manufacturer was not notified. The failure mileage was unknown.

The contact owns 2014 GMC Sierra 1500. The contact software modification done at a transmission shop, affected the Active Fuel Management not allowing diagnostic. The manufacturer was not notified of the failure. The approximate failure mileage was 210,000

Traveling home the day I purchased vehicle going through [XXX] with cruise set on 35,negotiating a right handed curve in the road and a vehicle was stopped in center lane turning left and my vehicle abruptly braked causing the vehicles behind me to take evasive action to keep from hitting me from behind INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

While driving, the vehicle suddenly began running rough, losing power, and displaying engine warning lights. Due to the severity of the issue, the vehicle was towed to a GMC dealership for diagnosis. The dealership diagnosed lifter failure and a cracked cylinder head. The dealership also documented coolant intrusion, oil/coolant contamination, and evidence of internal engine damage. Repairs were attempted, including replacement of the cylinder head and lifter. After the repairs were…

While driving on the highway, the steering became much more stiff, and then I heard metallic clanging sounds for a few seconds. The dashboard said press start to start Vehicle. I pressed start while going 30 miles an hour and all lights and instrument clusters went black. I pulled into the grass median where the truck would not start or shift gears. Truck was towed to a GMC dealership

The contact owns a 2019 GMC Sierra LD 1500. The contact stated that while driving approximately 65 mph, the vehicle, went into low power mode, and was able to move safely to a and then the vehicle stalled. The vehicle was towed to an independent mechanic and was diagnosed as the engine has no compression, suspect a possible crankshaft failure, also a possible engine replacement. The manufacturer was notified of of the failure. The contact associated the failure with NHTSA Campaign Number…

The contact owns a 2022 GMC Sierra 1500. The contact stated while driving, the vehicle decelerated unintendedly and failed to exceed 50 MPH on several occasions. The check engine warning light illuminated, and the message Reduced Acceleration - Drive With Care was displayed. The vehicle was taken to the dealer on several occasions, and the OnStar sensors, the fuel injectors and 8 spark plugs were replaced; however, the failure persisted. The vehicle was taken back to the dealer, who retrieved…