2024 GMC Sierra 1500 fuel system problems

Filed Oct 26, 2026 · Electrical, Fuel system · KY

My truck has experienced recurring diagnostic trouble code P244B on [XXX], [XXX], and [XXX], 2026. The latest occurrence included a check-engine warning and reduced engine power. On [XXX], at 40,833 miles, Neil Huffman Chevrolet GMC in Frankfort, Kentucky, diagnosed a damaged diesel particulate filter differential-pressure sensor connector. The dealership's written estimate states that the connector had shorted, begun melting, and had broken wires at the back of the connector. I am concerned about the cause of the electrical overheating, the possibility of additional wiring damage, and the risk of unexpected reduced engine power while driving. I have also experienced intermittent transmission-related warnings and communication fault codes, although I do not know whether these problems are related. I understand there are GM technical bulletins addressing wiring-harness damage on certain 3.0L Duramax vehicles. I am not claiming these bulletins establish the cause of my failure, but I would appreciate having my experience evaluated for a possible safety-related defect trend. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Sep 19, 2026 · Engine, Fuel system · FL

The truck has shut off driving 5 times total and 3 different days, I was going down the interstate, and Hwy. Speeds were ranging from 45 to 70, this is the 3rd time in the shop. At two different dealers.

Filed Sep 9, 2026 · Engine, Fuel system · WA

Lifters and camshaft failure, loud clanking, & sudden power loss on the 6.2 motor are the first noticeable signs. Instantly when everything happened check engine light, cruise control, & stabilizer lights flashed. The sudden loss of power forced the vehicle to suddenly slow down forcing my camper into the truck. I was hauling a within weight standerd camper but had difficulty bringing both the truck with the camper to a safe stop. There were no early signs or signal prior to sudden cautostrophic engine failure & all service records have been completed by a GM certified service dealer.

Filed Aug 10, 2026 · Engine, Fuel system · AR

Was traveling home and started losing power going up a hill on XXX. The truck was surging, the check engine light came on and an audible warning of no (low?) oil pressure. The truck shut off on a busy interstate highway and barely got onto the shoulder. The tow truck driver had to lay on the ground with part of his body in the lane of travel to place "skids" under the rear tires because there is no way to place this vehicle in neutral for a tow without a special GM tool. When I contacted Harry Robinson GMC service center in [XXX], they told me that it was no longer a safety recall because the truck had passed diagnostics and new, high viscosity oil was put in the truck XXX. The GMC app says code P0016 which is the dreaded 6.2L camshaft to crankshaft alignment that accompanies engine component failure. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jul 22, 2026 · Engine, Fuel system · MA

I was driving on the highway when the vehicle started to make clinking noises. The vehicle started to lose power as I accelerated it would feel like something was pulling me in the opposite direction and the knocking noise would get louder. Ultimately, I had the vehicle towed to a dealership. This vehicle passed the L87 recall not too long ago, and the vehicle is barely used.

Filed Jun 14, 2026 · Engine, Fuel system · NH

My truck engine has failed due to metal shavings in the oil related to the L87 engine recall, and the failure occurred after GM had replaced the truck’s oil as part of the recall remedy. The recall remedy did not prevent the failure of the engine.

Filed Jun 14, 2026 · Engine, Fuel system · NH

My truck engine has failed due to metal shavings in the oil related to the L87 engine recall, and the failure occurred after GM had replaced the truck’s oil as part of the recall remedy. The recall remedy did not prevent the failure of the engine.

Filed Jun 1, 2026 · Engine, Fuel system · MI

The vehicle received the official N252494001 recall oil remedy on 06/27/2025 at 15,438 miles (but suffered catastrophic engine failure and loss of propulsion at 33,661 miles on 05/30/2026).

Filed May 8, 2026 · Acceleration, Engine · CO

I passed the recall inspection on 12/17/2025 and the higher viscosity oil was put into my vehicle. On 12/25/2025 my vehicle's engine shut off while I was traveling on the highway (I-25). The vehicle went into to neutral and I had to pull over to the side of the highway without power. The vehicle started again and as I was merging onto the highway it shut down again. The truck started again and I was able to drive it home. There were no codes found when I took it in for service on 12/26/2025. On 01/24/2026 I was driving on the highway (US-40) and I had complete engine failure. I had to get my vehicle towed to the service center and a new motor was installed. On March 27th the vehicle's engine shut off again while driving on the highway (US-191). There were no codes or check engine lights on this time either. The service records state that the starter mount stud was loose.

Filed May 4, 2026 · Engine, Fuel system · 33,400 miles · MI

The contact owns a . The contact stated that upon restarted the vehcile experienced harsh restarts and lurch forward. The contact indicated that the failure and become more frequent. The vehicle was taken to the local dealer was unable to duplicate the failure and no service was performed. The manufacturer was notified of the failure.. The failure mileage was 33,400.