2017 GMC YUKON Complaints

So the shock strut system up front has a grommet that holds it in. The repair order said they put a shock simulator in the car and it gave false reading saying it was good and it came out broke break line and caused me to jump a curve to stop the vehicle. ALSO Now the THE TAIL LIGHT IS OUT AND NO WAY TO REPAIR IT NO ONE HAS THE LIGHT. Also this car is on its third transmission

My engine starting making a knocking/ticking noise out of no where. I was traveling alone on the highway so I stopped to check it. I got to a gas station and google searched it and it came up that the LS 6.2 engine that is in my vehicle was recalled on other models because of this issue. I did have a mechanic look at it as well and he agreed it is that same issue that was recalled in other models.

The 2017 GMC Yukon has serious transmission issues that GM continues to ignore, and it is going to get someone hurt. I was stopped at a red light, and when it turned green, I pressed the gas pedal but the car would not move. I pressed harder, and then it suddenly lurched forward about 30 feet. If there had been a car in front of me, I would have hit them and likely caused injuries. When I took it to the dealership, they said it needed a full transmission replacement, which was not covered. I had to pay out of pocket. I was only about $10,000 outside the warranty when it failed, and GM refused to stand behind their product or help in any way. I was already financing the vehicle and should not have had to pay for a new transmission on a car that was less than four years old with relatively low miles. This is not just my experience. Many others have had the same issue. GM knows about it and chooses not to acknowledge it. They are lucky no one has been seriously injured or killed because of it. Going to attach all of the proof of people "coincidentally" experiencing the same issue.

The 8-speed automatic transmission (Hydra-Matic 8L90) on this 2017 GMC Yukon SLT 5.3L V8 has failed. This is a repeat failure — the transmission was previously rebuilt in 2020 under a GM recall/service action for the same known defect affecting this transmission type. The transmission has now failed again in 2026, approximately six years after GM's prior repair. Prior to failure, the vehicle exhibited hard shifting, shuddering during acceleration, and hesitation between gear changes — symptoms consistent with the known defect pattern documented across 2015–2019 GM vehicles equipped with this transmission. The failure was confirmed by a service center. The vehicle is currently not safely drivable. Safety concern: erratic and unpredictable gear changes, including sudden lurching and hesitation during acceleration, create a dangerous condition for the driver, passengers, and other vehicles on the road. GM has been contacted through their Customer Assistance Center (case opened). GM's initial position was that they cannot assist because the vehicle is out of warranty. However, this is a repeat failure of a previously repaired known defect. GM issued 13+ technical service bulletins on this transmission and has been aware of the root defect since at least 2018. A federal class action (Speerly v. General Motors, E.D. Michigan) covering this exact vehicle type and transmission has been certified and upheld by the Sixth Circuit Court of Appeals. The prior GM repair did not remediate the underlying defect.

Engine stalling, a rough-running engine, reduced power mode (sluggish acceleration), a "Check Engine" light, or the vehicle failing to start. It started puttering really bad and died in the middle of the intersection. Check engine light came on. I got it to start, was really hard start and puttered bad then it died again and then I got it to start again, was a really hard start and puttered and died again. I was able to start it again get in the driveway but couldn’t go very fast. Check engine codes present are P2635 and P018B

Transmission problems, loss of power. Put a reader on car and said it was a selinoid. Replaced that and now it has happened again

Slipping Gears: Many Yukon Denali owners report experiencing unexpected gear changes or loss of power while driving. Hard Shifting: This problem manifests as harsh or abrupt gear changes, often accompanied by noticeable jolts when shifting from one gear to another. Unusual Noises: Grinding, whining, or clunking sounds when shifting There has been a class action lawsuit for this. I'm not sure why it has not been recalled in all states.

My truck lost power while I was driving. Took to a shop and they found that a had a bad lifter. I have all of my service records from the GMC dealership where I had my vehicle serviced on a regular basis.

I started noticing issues with my transmission around 55,000 miles on it. It first started with no noticing that it wouldn’t gear down when it needed to, and then when it finally did gear down, it would really jerk the vehicle. I started calling GMC then and questioning and putting in a claim. Just went back-and-forth four months. Now it was getting worse to where I could feel the transmission slipping it wouldn’t kick into upper gear or lower gear. Again, I was still calling GMC and reporting these issues. I was told to take it and have a transmission oil change, which I did costing me $300. I still noticed this problem and I continue to call. I kept being told that they would have somebody call me back which nobody ever called me back to find out specifics. I took it to a GMC garage have them put it on a machine, and I was told that it needed a new transmission and this wasn’t something GMC was covering. This new transmission cost me $6200 and was done on 1/5/25. Please remember this vehicle only had 64,000 miles on it, which is absolutely ridiculous to need a transmission at this mileage. I again had called in January 2025 reporting this and was told someone would call me back and never heard from them.

This has been going on for a while now, but it’s getting worse overtime. If I push on my brakes more than twice the brake pedal locks up and I have to push extremely hard to get my vehicle stopped.. luckily I have never been going fast and had to worry about this. This is normally when I am pulling into a parking spot or I am backing up that I have to tap on my brakes a few times. A couple of times I have bumped the pole in front of my parking spot due to not having brakes. I just put in a general date as to when they started to get worse.