GMC Complaints

The contact owns a 2015 GMC Terrain. The contact stated while driving 70 MPH with cruise control activated, the RPM suddenly increased to redline, after which the vehicle lost motive power. The contact was able to coast to the shoulder of the roadway, where the vehicle failed to restart. No warning lights were illuminated. The vehicle was towed to the dealer, who diagnosed a failure with the positive crankcase ventilation (PCV) valve, which then caused a failure with the front crank seal, resulting in damage to the engine. The contact was informed that the engine needed to be replaced. The vehicle was repaired. After investigating the failure, the contact related the failure to NHTSA Action Number: PE25001 (Engine, Engine and Engine Cooling). The manufacturer was notified of the failure but provided no assistance. The failure mileage was 148,000.

While driving my 2022 GMC Sierra Denali 6.2L truck, it somehow turned off. I placed it on neutral and tried to turn on, but it didn’t. I maneuvered to stop at the side of the road, but I was not close enough to the curb making it uncomfortable for others to drive around. I tried again to turn on the truck, but it didn’t. Before and after everything looked good, there were no symptoms or warning lights on the truck. I gave it a break and tried to turn in the truck, but it didn’t. I called GM roadside asst., and I got towed to the closed GM Services. They found out that battery was damaged, and an open starter fuse damaged. They changed the battery, the fuse block, and did the multi-point vehicle inspection (MPVI), and everything seemed good. I picked up my truck, and on my way back home the engine stopped running. At this time I get into a left turn lane, and I was able to stop before the stop line. This time I was in the middle of the road. I turned on the Hazard Warning Lights, but too many cars turning left pass through making it dangerous to my safety and others. I called the service department where my truck was serviced and GM roadside asst., and it got towed to the same service place. All this process was again around 2 hours in the middle of the road. They checked the truck, and found out that the battery was damaged, and an open starter fuse again. They changed, but this time they kept it on test to the next day and the starter fuse was damaged again. They found that the engine was locked, which is why the starter heats up and the amperage consumption increases, opening the fuse, the engine does not turn easily, the oil is at the correct level, it does not indicate low pressure in the initial driving test. They removed the oil pan and found metal particles in the oil and in the pan. After that they removed the rod bearings and can see that they are scratched and overheated, crankshaft scratched as well. Need order a new engine, oil cooler, oil cooler lines.

Lifter stuck 6000.00 dollars worth of damage on 2017 Yukon . All lifters and cam shaft need to be replaced . Vehicle is at foley automotive so I don’t have a receipt yet [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Failure in the lithium-Ion battery system. Battery conditioning system failed to manage heating and cooling of the battery system leading to catastrophic system failure. Dealership and manufacturer are unable to make repair leaving the vehicle un-operable.

- Rearview camera system (backup camera) which is malfunctioning increasing risk of a collision and safety concern. - Yes it can be available for inspection upon upon request. - Problem was reported to dealer 4/15/25 for inspection on 4/24/25 - Vehicle has not been reported to manufacturer, police, insurance representatives as it is scheduled to be checked by GMC dealer who claims there are no outstanding recalls on vehicle when it is the same known problem on other 2022 GMC Yukons (SLT) and others. - No warning lights appeared prior to camera malfunctioning.

While towing my boat to the Florida Keys, I encountered a series of mechanical issues on Interstate 75. The engine’s exhaust became excessively loud, causing the engine to abruptly shut off. Despite successfully maneuvering into the safety lane, I was unable to restart the engine. I promptly contacted the dealership, which dispatched a tow truck to my location. However, the tow truck driver was unable to put the vehicle in neutral gear. Subsequently, I reached out to GMC, which informed me that the tow truck required a flatbed for transportation. I waited another two hours for a flatbed truck to tow the vehicle to the dealership. A few days later, I received notification that my engine had seized, necessitating an engine replacement. The dealership informed me that the 6.2-liter engine was experiencing a national backorder. I had purchased this used vehicle less than a month prior and had not yet made my initial payment. Consequently, I find myself without a vehicle. The dealership has been unable to provide an accurate timeline for the repair to be completed.

At 61k miles motor siezed. Took 3 months to get a replacement this was 10/24 got truck back Jan 25, drove 3k miles and motor is knocking. Been at dealer since 2/2/2025. Waiting for replacement motor.

It's a problem that occurs when my Acadia fails to recognize that the gear shifter is in the park position. As a result, the car doesn't fully shut down, leaving the engine running. Unable to shut down vehicle if shift doesn't fully activate brake notice, and could be a safety issue if it truly doesn't park. I have not taken the vehicle to a dealer or services to have the problem reproduced yet. It also has not been inspected yet, however, after doing research online, GMC did put a recall notifying owners that this may be a problem in vehicles from years 2017-2021. When I place the shifter into park, the car does not recognize it, and alerts me to put it into parking. It started appearing 2 months ago.

I was driving down the interstate traveling 75 mph and with any warning the vehicle shifted into neutral. I made my way to the side of the interstate with any ability to accelerate on a busy stretch of highway. I had my children in the car with me. After making my way off the road, I shifted car to park and it wouldn’t go back into drive. I turned the car off, in an effort to put the car back into drive. The car wouldn’t not restart. We were stranded in the side of the interstate 6 hours from home. I had the vehicle towed to Ed Morse GMC in Rolla, MO. The let me know after a few days that my vehicle needed a new engine and that this has been an issue with other 2021 GMC Tahoe vehicles. We decided to have the vehicle towed to Bob Howard GMC in our town, Edmond, OK, and they confirmed a new engine was needed. In all we had to replace the engine, radiator, cooler lines and fuse array. There were zero messages or warnings leading up to this event. This was very u expected, scary and u safe for not just my family in my vehicle, but all the vehicles around my that day on the interstate.

Vehicle wont go in reverse and skips gears and an error came up to reduce acceleration. - Valve body Control assembly needing to be replaced.