2021 GMC YUKON Complaints

*gas tank had become partially dislodged from the undercarriage. *Entire family was in vehicle at time of incident, including three small children. The safety of an entire family along with any others that may have been on the road, if the car would have combusted due to the gas tank which had just been filled to capacity. *vehicle has been at Mark Christopher GM dealership for over one month. *dealership service dept claims someone tried to steal gas tank. *Mercury insurance company claims mechanical failure. *No warning given from vehicle. We heard a dragging noise while we were driving, pulled over as soon as possible. Upon inspection, it was observed that fuel tank had begun to leak fuel from dragging on the freeway.

Motor started knocking My safety and my family safety was put at risk because we were driving down the street. The car is now at Woody dealership in Naperville, IL. Being inspected as we speak. No symptoms prior to failing.

The forward collission system continues to perform phantom braking while driving in traffic resulting in near rear end collisions. The GMC dealer refuses to fix it without charging me for more diagnostic work, which has already been done twice. What is my recourse?

We brought vehicle in while still in warranty complaining of rough running engine and dealership said they couldn't find anything wrong. 2000 miles over warranty the Engine fails with all characteristics of the L87 bearing lifter issue. Now GMC does not want to replace without charging us a ton of money.

Our 2021 GMC Yukon XL with the 6.2L engine suffered a catastrophic failure requiring the engine to be replaced. The diagnosis was very similar to the GMC 6.2L engines that have been recalled for safety and failure reasons however our vehicle was not included in the recall. The engine only had 75,924 miles and was maintained to the manufacturer's maintenance schedule. The cost to replace the engine was $11,309.87.

Without any warning, the V8 L87 6.2 liter engine suddenly seized up, began shaking with significant reduced power. I was fortunate that I could drive slowly to safety and was not on the expressway. In my research, I understand this is related to a design/manufacturing issue with the connecting rods and crankshafts in this type of engine. As I investigated the issue, I found that 600,000 vehicles were recalled with the recall either completely replacing the engine or upgrading the oil type from standard to a thicker, higher-viscosity 0W-40 full synthetic to provide better protection under high stress, along with a new oil cap and filter. In our case, we were directed to change the oil and even with that change, we experienced this dangerous engine failure which cost us $12K ! For that cost of repair, we elected to have the engine replaced for about $1K more to get a 100K mile warranty on the engine. However, our additional concern with the replacement engine is they gave us a remanufactured version of the L87 and we have not found confirmation that they have adequately addressed the design/manufacturing flaws so may be vulnerable to the same seizing issue. We appreciate your attention to this widespread GM issue.

When turning on the car, a message pops up on the dash and will not go away. Dashboard says “ service safety restraint system”

Hello, I was driving on the highway with my family and my engine had a sudden loss of power. I only have 52,000 miles on the engine and it has been serviced the entire time. We almost got in a major accident as we had cars and trucks moving around us at a very high speed as we tried to pull over in the breakdown lane. I brought the car to Daddario GMC in Shelton, CT. They did a diagnostic test and said that cylinder 2 was misfiring. Upon closer inspection they saw that there was oil sitting on top of the piston head which indicates engine failure. I have since contacted GM warranty services given my car was just past the warranty date of November 2025, but still under the 60,000 miles of coverage. I did some research and have seen this is a very common with these engines as GM did a recall on 600,000 already. For some reason my VIN # is not listed on the current recall even though my engine is in the same year as the others that were. I would like GM to cover my engine 100% but was told they may only pay a % to fix it. Can you do anything to help me get them to cover the engine at 100%? I also wanted to let you know about this issue as my VIN was not under recall and this may happen to other people/families who have the same engine as mine that isn't recalled. Thank you, [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

While operating my 2021 GMC Yukon AT4, my vehicle suddenly developed a popping noise, the check engine light began flashing, and the traction control warning illuminated. The vehicle lost power and had reduced acceleration, forcing me to pull off the road because it was unsafe to continue driving. This created a serious safety risk and appears consistent with reported GM lifter or engine defects.

On April 20th, 2025 while accelerating from a stop light, my vehicle (2021 GMC Yukon Denali XL, 6.2L V8) started making a ticking noise and the service engine light started flashing. I was within a few minutes of my house and limped my vehicle home. The next morning, I started it and it exhibited the same symptoms. I called my local GMC Dealer, Wright Buick GMC, and was advised to have the vehicle towed to them. It was towed to the dealership and within a few days I was advised that the engine needed replaced. I had heard a story that there was a pending recall, so I had hoped that this would resolve itself without a bill to me. unfortunately I was advised that there was no actual outcome on how to handle recalls, so if I wanted my vehicle back, I would have to pay the $11K for replacement as I was outside of my power train warranty (I had roughly 73,000 miles on my car). I have hoped for some resolution to include my vehicle in this recall but I have not yet received any word from GMC.