GMC Complaints

I was travelling on the interstate at 75 miles per hour and the vehicle started slowing down and completely shut down. The engine warning light then came on and I had to coast to the side of the road. I was on the side of the interstate for about 45 minutes and the vehicle had to be towed. The repair shop informed me it was a complete engine failure requiring a new motor and that GM has an extended backorder time due to this being a widespread problem for these model years with the 6.2L gas engine. The vehicle is currently at the dealership and will be there for several months waiting on an engine.

The contact owns a 2018 GMC Sierra 1500. The contact stated that at start-up there was an abnormal ticking sound coming from the engine. There were no warning lights illuminated. The local dealer was contacted; however, the vehicle was not diagnosed. The contact was informed that the vehicle was out of warranty, and that the VIN was not under recall. The vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 17,000.

On [XXX] I was driving East on [XXX] in Joplin , MO at 75mph when my 2022 GMC Sierra put itself into Neutral. I could not get the truck back into gear and I was slowly decelerating. There were no warning lights or indications of a problem. When I was coasting down the Interstate and trying to get the truck back into gear, I would get a message that said "Conditions not safe for shift" I took the nearest exit and coasted to a stop in the end of the exit ramp. Once I came to a complete stop, my truck shut off. It never started again after that. I was blocking traffic from [XXX] and had to stand there for 30 minutes waiting on a tow truck to move me out of the way so traffic could flow again. There was no way to get the truck into Neutral again so that I could push it. The tow driver thought I had a bad battery but wasn't able to jump start it. I had him drop my truck off at my office where I planned to install a brand new battery. A couple hours later, we determined that the battery was not the problem. Still no warnings or indications of a problem with the truck. I towed it to the nearest GMC dealer the following Monday. It has been there now for 5 weeks waiting on a new 6.2L motor that according to the service department, needs to be replaced. I was told this is happening a lot across the US right now, which is the reason for no estimated completion time on my truck. I understand there is currently no recall or lawsuit even though, from what I was told, this potentially affects 880,000 vehicles. I feel that the way in which my truck stopped was dangerous and inconvenient to me and those around me. I would like to know what GM is doing to try and get these vehicles back running again and how we know that the replacement won't have the same issue a few more years down the road when the warranty is long expired. Currently in a loaner car from the dealer but as this is a registered commercial vehicle, we really prefer the truck back. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (

The contact owns a 2017 GMC Acadia. The contact received notification of NHTSA Campaign Number: 23V334000 (Air Bags); however, the part to do the recall repair was not yet available. The local dealer was not contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The contact had not experienced a failure. Parts distribution disconnect.

Transmission started fluttering around 60k miles. Per GMC Dealer - this is due to water getting into transmission from fluid put in at the factory. Even though dealer admitted that it's a defect from the factory, the warranty wouldn't cover the repair. This is a well known issue in the 5.3L 8 speed trans.

The valves, the pistons had to be replaced. The motor went out. The motor should be replaced but they did not give me that option. The vehicle only has 50K on it. Was kept in the garage. Had regular maintenance. The GM service garage has had this vehicle since 2-11-25.

GM 6.2L Engine shifted itself into neutral and shut down while my wife was alone driving 65mph on [XXX] in Tucson Arizona. No error messages or check engine signal, Vehicle Information Center advised pull over and push Start Button. Vehicle would not initially restart but did start within 5 minutes and my wife was able to limp along the 1/4 mile to the next off ramp to get off the highway. Local GMC Dealer confirmed the seized motor and immediately ordered a new GM motor. Vehicle is 18 mo's old with 26,500 miles and is sitting at the dealer. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

2014 GMC Acadia Denali When accelerating the car is sputtering and slipping. The RPMs are increased. There is a delay in shifting and it is rough. The car jerks and has a pause when accelerating. This is an expensive repair. Is GMC going to help or make it a recall? My local mechanic suggests it gets repaired as soon as possible or sell it - am not comfortable selling it with a bad issue. Unsafe. GMC needs to correct this. GMC - do your part and make this right for your customers. I read many complaints regarding this issue. How many complaints does it take before GMC will make a recall on this issue? I also have a recall on the airbag. I have been having an issue with the light on for 2 years and called many times on it. Last year they said there was no active recall. I see now that there is one. I called and was told that I should have received a letter. I never received a letter of the official recall and the repair is covered. I am now waiting 4-8 weeks for the dealer to get the part in and for them to then call me to schedule an appointment. Why do they not have them in stock? I have been scared every time I drive my 2014 GMC Acadia knowing at any point the airbag could go off at any moment or if I was in an accident it may not inflate to save me. This is terrifying as a driver. Especially knowing that serious injury or death can happen. I hope GMC is going to do the right thing and make the transmission issue a recall and have parts on hand at dealers to get repairs fixed. What is GMC going to offer me and other customers to help pay for this serious issue to be fixed? As well as, pay for a rental car while waiting to get the issues resolved.

The contact owns a 2020 GMC Sierra 1500. The contact stated while driving 70 MPH, the low oil pressure warning light illuminated. The contact pulled over to the side of the road and noticed that the oil level was abnormally low. The contact added oil to the vehicle and continued driving. The vehicle was taken to Mike's Garage, where it was diagnosed that the valve cover was fractured; however, the part to repair the vehicle was on backorder. The contact related the failure to TSB Number: 22-NA-027. The dealer was notified of the failure and informed the contact that the vehicle was not covered under the TSB. The vehicle was not repaired. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 96,000.

Had unexpected loss of engine power, rough idle and warning lights. Has been out of service in the GMC dealer for almost 6 weeks to date. No diagnosis. No repair date. No response from GM other than "waiting on diagnosis" No loaner or rental provided. Still under warranty. 6.2 v8. Engine failure suspected. I am reporting this to help switch the investigation to an actual recall of the wide-spread issue with this engine. No documentation written information provided by GM.