complaints.title

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 o…

6.2L crankshaft failed

15000 miles and the engine spun a bearing and the engine blew

My GMC sierra AT4 with the 3.0L Duramax Diesel, has 1,500 miles on it, when the engine failed. I was traveling from [XXX] to [XXX] , towing a trailer, when the check engine light came, and the truck …

Truck does not automatically shift into park when the door is opened. Getting out of my truck, I forgot to shift into park and opened the door, and the truck moved forward with automatically shifting …

First occurrence was 02/27/2026 - onstar detecated a critical issue, the check esc, check tsc words came on in the center dash, then the orange lights came on and my truck went into limp mode at a sto…

Got in started Truck and there is no Sound anywhere... none for blinkers, radio, warning lights if there to be any. ZERO sounds. This has been investigated by Hertrich Service--showed video of no s…

Safety Complaint – Delayed Acceleration from Automatic Engine Stop/Start I am reporting a safety concern regarding the automatic engine stop/start system in my GMC truck. During normal operation, …

The electronic part of the truck gave a warning and shut off my trailer brake system while towing a 21K 5th wheel trailer (X2). The truck is available for inspection. Any part of the electronics pac…

The contact owns a 2025 GMC Sierra 3500 used for hauling a 2026 Aluminum Trailer equipped with a DeeMaxx: DBI-7K-MAXX-SS-KIT brake kit. The contact stated that while driving at an undisclosed speed, t…

The contact owns a 2025 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the engine made abnormal knocking sounds. No warning light was illuminated. The vehicle was take…

I am reporting a serious safety issue involving unintended acceleration in my vehicle. The vehicle accelerates unexpectedly without driver input (specifically without pressing the “resume” functio…

I stopped at a stoplight and my truck shut off, the doors unlocked and then immediately restarted and then came up with a bunch of errors telling me that my brake system failed and to get the traction…

I was traveling on the I70 West around the 210 mile marker. I was in the passing lane at high speed when the vehicle without warning switched itself off. The dash showed the “press start” warning,…

I bought a brand-new GMC 1500 6.2L AT4 back in 2025. Never have an engine recall. At 39K miles, lost power, and ended up replacing the camshaft and lifters. 2K miles later went back to the dealer for …

Randomly when the truck is turned on, the turn signals will stop working, no noise, nothing. When this happens, the infotainment system also stops working. It is unsafe to be driving and not knowing i…

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…

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 driv…

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…

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 s…