GMC Complaints

Lifters in engine failed at beginning of March 2025 and destroyed inside of engine. Transmission failed in summer of 2024 and had to be replaced

Driving at highway speed the upper part of the front grill assembly detached at the hood, hitting the windshield on the drivers side causing the windshield to shatter in front of the driver. The piece flew back and hit the car behind me. This would have been an accident with a less experienced driver

Truck was going into the shop for general maintenance when the engine stopped working just as we pulled into the dealership. The dealership towed the vehicle in to diagnose the issue and we were told the engine has blown. No warning, nothing. The vehicle went into the shop in December and still GMC cannot offer any lead time on when they can repair the engine.

When I first bought my 2018 GMC Sierra with the 8 speed transmission it would shift hard from first to second gear. Then at around 58,000 miles my truck also started to have a vibration coming through the steering wheel around 45-55 mph. I took it to the dealership and they changed the transmission fluid and did a software update. I am now at 80,000 miles and my truck still shifts hard from first to second gear and makes a grinding sound when accelerating sometimes. I am afraid to drive my any long distances for fear of the transmission malfunctioning. I have not been back to the dealership since my truck is no longer under warranty. So the problem has not been reconfirmed by a dealer or independent service center or inspected by the manufacturer. There have been no warning lamps or messages or other symptoms. I hope that GM is held accountable for putting a faulty 8 speed transmission in my truck.

Engine locked up while driving. I was able to get off the highway. Truck would not crank back up. When trying to start it screens would light up then go black. I had truck towed to nearest GM dealership. The GM dealership informed me that the engine was locked up.

Allison transmission - random hard shifts, random multiple DTC's, random limp mode. Clear codes and works fine until it doesn't. Might have to clear codes 3-4 times a day or it might make it a week before it goes into limp mode again.

I was driving down [XXX] near Harrisburg PA in an active construction zone when the truck shut off, the dash blinked a few things very rapidly then went black. I was barely able to coast to an area large enough to get my truck out of the highway traffic. I was stranded on the side of the highway for 4 hrs and due to the construction hardly able to get out of the truck safely as it was around a bend. I’ve had to have the truck towed to a few mechanics to learn that it has suffered a catastrophic engine failure as all cylinders have lost compression. It made no noise at all. There was no signs this was going to happen, just driving normally then a complete engine failure resulting in no compression in all 8 cylinders with no noise. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I was driving my 3 children to a basketball tournament. I was going about 70 mph on the highway when my dash started flashing "Engine Oil Hot", a few seconds later my vehicle completely "shut off/died". I merged over to the shoulder of the highway and tried to restart my vehicle, yet it just "clicked" and seemed to be "dead". The safety of myself and my 3 children were at risk, being stranded on the side of the highway far from home waiting for the tow truck. To say I was scared is an understatement, there was no warning signs so I could prepare for this. My vehicle was towed into a dealership, later that week I received a call saying I will need a new engine. I was told this could take up to 1-4 months because so many other vehicles with the exact same failure are waiting for their engine replacements as well. I am a working mother of 3, and now I am out of a vehicle for 1-4 months. I bought this vehicle new to be a reliable and large enough for my family, little did I know I would be left with no means of transportation because of a faulty engine!

While attempting to accelerate to get onto the expressway with no warning, the vehicle went into limp mode. Traction control, front end warning collision, auto/stop start functionality was all disabled and the engine light warning light on came on. The vehicle locked out and reduced acceleration. An attempt to pull over and turn the vehicle off for a few seconds was made. Once restarted, the vehicle continued running on limp mode at reduced speeds with the same indicators mentioned still disabled and locked out.

I was traveling in my 2021 gmc Acadia in which I have had numerous issues with is the almost 4 years I have owned it. The back up camera 2 weeks after purchase it went out in June of 2021. After that The vehicle In October of 2021 I get in the vehicle on rainy day. Infotainment systems reads error with the SD card that Issue progressed I called dealer finally I get service appointment after strike and my vehicle sits at Roger’s Pontiac GMC 2660 Michigan Ave Chicago IL 60616 for 10 hours now I placed thread around the crowl and by knob. Car was not touched I was told it was a internal issue and that the GM Engineers would need to replace the infotainment system They looked at it again In November of 2022 No closer to finding a problem I called Gmc Because by now My Temperature coolant sensor was working then not working car would say reduced parking assist and then if hot Air conditioning wouldn’t work I Called GMC offices filed numerous complaints. They called the service manager no one would take calls nothing would get done. So [XXX]I’m Driving down [XXX] heading east a big Truck flys off of [XXX] slams into side of my SUV Destroys every panel on passengers side of vehicle The Acadia mine with all the curtain air bags in the a pillar in ceiling on the front and back seats on top Side and bottom side not one deploys not even on the A pillar where rear passengers door is ripped off. I was knocked out if anyone was in them 2 seats like my 2 kids that are always with me [XXX] they could have been killed no safety bags deployed? I basically begged for auto to be repaired of electrical issues when only 2000 miles on it with 900 miles on it GMC I called every week for almost 2 years no help now this! I was injured have not much memory of accident. This auto needs be taken off road I deserve like I asked for when new same car just without issues I could have been killed but no one cared. Now look no air bag INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)