2025 GMC SIERRA 1500 Complaints

What component or system failed or malfunctioned, and is it available for inspection upon request? ENGINE FAILURE- CRANKSHAFT ENDPLAY WAY OUT OF SPECS. How was your safety or the safety of others put at risk? HIGH POTENTIAL FOR ENGINE FAILURE WHILE OPERATING VEHICLE. Has the problem been reproduced or confirmed by a dealer or independent service center? SPECIFIC ISSUE WAS DIAGNOSED AT A GM DEALER- Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? GM DEALER ONLY-NO ADDITIONAL INSPECTIONS PERFORMED. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? NO WARNING LIGHTS EVER DISPLAYED, ONLY EXCESSIVE ENGINE NOISE. SYMPTONS BEGAN AROUND 6,900 MILES

The contact owns a 2025 GMC Sierra 1500. The contact stated that while the defroster was activated to clear the windshield, the blower vents on the passenger’s side started making an abnormal hissing sound, and air produced by the blower motor decreased and was inadequate to clear the windshield. There was no warning light illuminated. The contact stated that the failure occurred while there was light snow covering the hood and on the outside vents underneath the windshield. The contact had taken the vehicle to a local dealer several times, and the dealer was unable to duplicate the failure. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 3,000.

The contact owns a 2025 GMC Sierra 1500. The contact stated that while stopped at a traffic light, the gear shifter was shifted to park(P) and the vehicle stalled. The message "START Engine" was displayed. The vehicle was restarted, and the Auto START/STOP feature was disabled by pressing the "A" inside an orange circle. The contact stated that on another occasion while reversing into the driveway, the vehicle stalled. The message "START Engine" was displayed on the screen. The dealer was contacted; however, the vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired and the failure persisted. The manufacturer was not notified of the failure. The failure mileage was approximately 16,000.

2025 GMC Sierra 6.2 L V8 engine failed by locking up or seizing. Heard pinging / knocking sounds while driving 3 miles from my home to the dealer. Engine shut off without warning, vehicle shifted to Neutral. Coasted to a stop, attempted to restart the engine, would only crank. Dealer diagnosis is that the engine will need to be replaced. Sounds just like the 2021 - 2024 GM recall for this same engine. Vehicle has 11,670 miles on it. Safety risk: Loss of ALL power while driving. No Warning lamps or messages prior to engine failure.

was driving truck and reduced acceleration drive with care comes up on dash pull over shut truck off start truck warning gone in 30sec back on and repeat drive off again then truck shut off while driving and try to start again and the dash went black motor did not turn over then tried again and same thing called tow company and had towed to dealership. dealership said it had 2 pages of codes and now needs a new motor........ no estimated time on getting my truck back

Car flashes "service driver assist system". Took to dealer and they referenced PIT6455 which states GM is still investigating the issue. Truck was returned to me - very concerning to have truck saying driver assist needs to be serviced and GM is unable to service it!

This happens many times, at random intervals, and sometimes it does not happen at all, but I would say about 33% of the time, it happens. When you put the vehicle into reverse, the side mirrors will lower slightly, so that its easy to see the ground, or parking lines, etc. When you then go back to park or forward gear, the mirrors are supposed to go back to the position they were earlier. The original starting point. But that's the problem, many times, they do not go back to the starting position and you must then push the preset buttons to make them go back to your desired view angle.

The truck keeps wanting to engage two gears acceleration and deceleration and still is happening i have taken it to the dealership an they can not find a problem took it home an its happening again so now its back at the shop now I'm waiting to hear back from them so this is the second time to the dealership

2025 GMC Sierra 1500 has had 2 engine failures since purchase date June 2025. Engine failed on a road trip with my family, leaving me stranded for hours. After the problem being resolved, engine failed once again after 5 months. On the dash it said loss of power and wouldn’t crank to turn ON

I was driving and the engine abruptly stalled. The truck self-shifted to Neutral. Once stopped, I shifted to Park to attempt a restart. It would not crank. I was on a 2-lane road so I did not have a shoulder. Once I realized it would not restart I tried to shift to Neutral so I could push it to a subdivision road about 50 yards away only to find out my transmission has no ability to shift to Neutral (the dealer confirmed this later). So I was stuck on the road for hours just over the crest of a hill with people coming up on me and my family at 50mph. It was a windy 10 degrees so we could not wait on the side of the road where we would have been safer. This is how people get killed; being stopped where people can't see you and do not expect you to be stopped. Why can I not get the truck off the road? If this happened on an 8-lane highway how would I get to a shoulder, even after traffic had stopped behind me? On top of all that, the problem with the truck ended up being an engine bearing failure (per the dealership service dept) that is a known problem with this engine and truck build date. General Motors needs to proactively diagnose and get these engines replaced before someone gets hurt. There is a TSB issued for the bearing issue but when I asked my dealer about it a month ago, before the failure, they acted like they knew nothing about it and told me to bring it in if I hear noises. If they had offered to check the crankshaft endplay when I asked about it ( as the TSB suggests), I may not have gotten stranded and my family's safety put at risk. There were no warning lamps, and no strange noises before the engine seized. My fuel economy had decreased by about 20% in the last month but that may be from cold weather operating conditions. I have a separate electrical issue that I've been chasing down and I assumed this stall condition was related to that. But the dealer confirmed this was a bearing failure.