GMC Complaints

For 3 weeks now, my dash keeps telling me to shift to park when my gear shift is already in park. Car will not allow me to secure it because it thinks the car is not in park!

Vehicle went into limp mode. 36 check engine codes popped up all related to cam shaft and lifter issues. Vehicle was taken to a shop and it has been determined that the passenger side lifters and rollers have sized due to the active fuel management system. This is the L86 GM 6.2 liter motor, that has developed the same issues that the L87 motor is being investigated for. There where no tail tail signs or check engine lights that were on prior the the lifter failure.

Approximately 14’000 miles we were told a rod went through the engine. Our vehicle failed at a high rate of speed leaving myself, wife, and 2 young children to pull off a major highway and call for police to help slow traffic. This happened while driving 70 mph on the highway. The only warning we received was when the car went from “D” drive to “N” neutral on the highway. Fortunately, we had enough time to pull to the side of the road before complete engine failure. GMC road side was not helpful. We were told we would have to find a ride home over an hour away, and when our ride arrived, so did the tow truck. Then, they had to drag the vehicle onto the flatbed because the tow truck company did not have the unlocking device for the wheels. Upon getting it to our house, the tow truck company had to rock our vehicle off the bed! We were not able to tow it where we purchased it. We either had to tow it to the nearest GM dealer or our house. We chose our house because the nearest GM dealer from where we broke down would've been over an hour away from our house. Our second engine failed 2200 miles later while my wife was sitting at a light in a busy intersection. The car again went from “D” to “N,” and it was immovable. The cops had to be called because the tow company couldn’t come fast enough. We were towed out of the intersection, but I waited over 5 hours with several dropped tows for a tow company. That occurred on my birthday. We are now on our third engine, and GMC wouldn’t warranty the engine. Our brand new tires went at 32,000 miles because GMC could not confirm or deny that rocking our vehicle on and off the flatbed three times didn’t affect the alignment. The front two tires inside tread was worn. I was told the tires from the factory are 50+ thousand mile tires. We barely got 32,000 miles. We’ve had multiple issues with electronics, back up camera, and media package. The Lemon Law won’t cover us because our first engine did not fail before 12,000 miles.

[XXX] [XXX] [XXX] April 17th, 2025 Spearfish Cadillac Attn: [Service Manager or General Manager] North Main Spearfish, SD 57783 Subject: Engine Failure and Safety Concerns – 2023 GMC Denali Ultimate (6.2L V8) Before ordering my 2023 GMC Denali Ultimate (MSRP $96,000), I raised concerns about online reports of engine problems with the 6.2L V8. I was assured by your staff that there were no known issues with this engine and that I had nothing to worry about. However, within the first year of ownership, I began reading verified reports about widespread engine failures involving this same 6.2L engine across various GM models. I contacted your dealership again and was told that my vehicle’s VIN did not indicate any problem or need for replacement. Since that time, I have experienced two severe engine failures, both at highway speeds of approximately 80 mph. Each failure caused my vehicle to abruptly shut down and lurch into a different lane of traffic—creating traumatic and extremely dangerous situations for both myself and surrounding drivers. In addition, I encountered another instance in which the engine would not start. A stranger helped me jump-start the vehicle on two separate occasions. Believing the issue could be battery-related, I replaced the battery (which was less than three years old), only to suspect later that the engine may have partially locked up. I am formally requesting the following: A written response confirming whether a replacement engine has been or will be installed in my vehicle, and if so, whether it is a new build, remanufactured, or an identical L87 engine model. Confirmation of whether any updated parts or engineering revisions were made to resolve known lifter or bearing issues. Full disclosure of any Customer Satisfaction Programs (CS INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I had complete engine failure due to rod bearing failure resulting in the engine locking up and leaving me stranded on the road in 20° weather while waiting 2 hours for a tow truck. My safety was in jeopardy when this happened due to the extreme cold and being stuck on the side of a very busy highway. There was no warning and no warning lights on the dash prior to the engine failure. The engine in my truck is the L87 which is GM’s 6.2 liter V8. Once the truck was towed to the dealership they told me it was completely locked up and the needed a complete engine replacement that took over 8 weeks. Dealership told me the seized engine would be sent back to GM so they could inspect it for causes on why the rod bearings failed resulting in the seizure of the engine.

July of 2023, lifters failed on left side of engine. Lifters replaced and cam shaft replaced. January 2025, lifters failed on right side of engine. Replaced. March 2025. Engine seized on interstate. Truck lost all power while driving, no warning signs prior. Dealership has no rental vehicles and we are not old enough to rent from a third party company so family had to drive 9 hours to our location so we wouldn’t be stranded. Three times this truck has failed us. GM is putting in a new motor as it’s still under warranty, but the new motor has no additional warranty. So basically this new motor will be warrantied for less than 7k miles. They cannot say if the new motor has the remanufactured lifters or not. So we could be facing the same exact issues. Can’t ever get ahold of anyone directly though GM.

I've taken my 2021 Yukon Denali to GMC dealers complaining of "clacking" noise coming from the passenger side of the engine on 3 occasions. Each time, they tell me that they do not hear anything. Now, I see that the L87 engine has defective bearings which could lead to abrupt engine failure which could lead to a dangerous situation. I envision power sliding on the highway going 70 mph and ultimately rolling over and getting killed. I am now frightened to travel on the highway and see no resolution forthcoming from GM. They are just looking at $. My wife and I are [XXX] and travel to Florida from Wisconsin every year for winter. The Yukon to me was the most expensive, ni est vehicle that I have ever owned, but now feel like I could die anytime while driving it. Who would want to buy it now with this cloud over it, all hinging on how GM handles this mess. I've only owned GM products my whole life, but would never buy another now. Lost faith, and hopefully won't die waiting for GM to do something. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I was sitting at a stop light and my vehicle completely failed without any warning. Was not able to start, etc. it was completely dead. There was no notice of issues or problems; no messages, no lights, etc. The vehicle had to be towed to a dealer and has been sitting for over 5 weeks waiting for a new motor. I was told that there is no timeline for when a new motor will be available and that it could be months! I travel with my vehicle for work so it is really needed!

Engine failed and it is available for inspection upon request The engine started coasting down a major highway and it put myself and others on the road at risk. The dealer has confirmed that this 6.2 L engine has been giving the dealership problems with these GMCs. The vehicle has only been inspected by the Dealership. The Warning Message stated that I needed to restart the engine; however, you can't do that on a major highway due to pressing the break. The vehicle was already on; however, the engine was not connected. No other symptoms were happening prior to the incident. The engine trouble appears only at this incident.

Engine shut off twice driving down the highway at 70 mph. Electronics completely shut down then started back up, engine shifted to neutral and wouldn't let me shift out of it. Pulled over to shoulder and restarted engine. Took to Ewing GMC and no issue was found, vehicle was returned. A week later, exact same thing, but this time engine would not restart. Had to be towed to dealership. Engine is blown and have been waiting on a replacement for 3 weeks currently. This is an extremely dangerous issue, people will die from this if it is not corrected. Even once I get the vehicle back, I'm concerned about my family's safety while driving it.