2020 GMC Sierra 1500 suspension problems

Filed Jul 17, 2026 · Suspension, Transmission · MD

My truck transmission beed jerking off and on for over a year. One time it lose power when i was driving and could have caused an accident. I took it to the dealership and they said i new a new transmission for $12000. Something just doesn’t seem right about this! I brought a brand new truck thats unsafe and its no recall for my model but other models with the same issue had a recall. I would just like some answers. I feel like i brought a lemon. Thanks for listening.

Filed Mar 5, 2026 · Suspension · OK

My 2020 GMC Sierra Denali diesel with approximately 90,000 miles experienced two separate front suspension failures within a short period of time. The driver side tie rod and wheel hub failed first and required repair. Shortly after, the passenger side front suspension failed in a similar way and the vehicle had to be towed. These failures caused the front wheels to become unstable and created a serious safety concern while driving. Suspension components such as tie rods and hubs should not fail at this mileage under normal driving conditions.

Filed Feb 11, 2026 · Suspension · ME

I am writing to formally express my dissatisfaction regarding a significant safety and reliability issue with my 2020 GMC Denali. Specifically, the vehicle is experiencing premature wear and imminent failure of the front ball joints. I expect the suspension components of a premium Denali-trim vehicle to last significantly longer than the 37,061 miles currently on my odometer. Industry standards typically place the lifespan of these components between 70,000 and 150,000 miles. Technical Details of the Failure: The vehicle is currently exhibiting the following symptoms of accelerated ball joint degradation: •Excessive Vertical and Lateral Play: Inspection reveals play in the right lower ball joint that exceeds the manufacturer’s maximum allowable wear specifications. The left lower Ball Joint is starting to have a small amount of play, according to the technician

Filed Jun 2, 2025 · Electrical, Suspension · 68,000 miles · MS

The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving 60 MPH, the horn failed to function as intended. There were no warning lights illuminated. The contact stated that on a separate occasion, the right lane sensor stopped working as intended. There were no warning lights illuminated. The contact stated that on a separate occasion, while driving 60 MPH in the rain or on rough asphalt, the rear suspension caused the vehicle to fishtail to the right. The contact turned to the left to control the vehicle. The contact stated that the vehicle returned to normal functionality after the failure. The low transmission fluid warning light was illuminated. The vehicle was taken to an independent mechanic, who diagnosed the vehicle with an electrical systems failure. The independent mechanic informed the contact that there was adequate transmission fluid inside the transmission, and it was unclear why the warning light was illuminated. The contact was informed that weights were added to the wheels to balance each wheel. The vehicle was not yet repaired for the other failures. The contact stated that the transmission was replaced a year prior to the failure, and the horn had failed to function soon after the transmission replacement. The manufacturer was made aware of the failure. The failure mileage was approximately 68,000.

Filed May 8, 2025 · Steering, Suspension · 17,000 miles · FL

The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle started pulling to the left, and the vehicle ended up in the next lane. The vehicle returned to normal functionality, but the failure became a regular occurrence. No warning lights were illuminated. The vehicle was taken to the dealer, who was unable to duplicate the failure. The vehicle was not repaired. The contact stated that the vehicle had been taken to the dealer six times because of the failure. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the federal safety agency Hotline for assistance. The failure mileage was 17,000.

Filed Sep 8, 2023 · Steering, Suspension · MI

The right side started clicking out of no where when I turn the steering wheel

Filed Jul 31, 2023 · Suspension · 41,000 miles · NY

The contact owns a 2020 GMC Sierra 1500. The contact stated while driving out of the driveway, the front passenger’s side wheel separated from the vehicle. The vehicle was towed to the dealer and the contact was informed that the upper control arm ball joint had fractured and that the front upper control arm needed to be replaced. The contact was informed that the vehicle was not included in the federal safety agency Campaign Number: 21V718000 (Suspension). The vehicle was not repaired. The manufacturer was not contacted. The failure mileage was 41,000.

Filed Jun 29, 2023 · Steering, Suspension · TX

The truck has developed a shake that can be felt in the floor boards, seat, and steering wheel at highway speeds. It’s has spent several months at dealerships without being fixed. I have replaced tires, wheels, shocks, upper control arms, and the transfer case without success.

Filed Nov 11, 2022 · Steering, Suspension · MN

Drivers side upper control arm failure. Threw truck into oncoming traffic. Dealership has inspected multiple times stating everything was good to go. Been complaining about a loud clunk to dealership for months

Filed Oct 20, 2022 · Suspension · UT

I was taking my truck to have an oil change and tire rotation at the dealership. I have just traveled approximately 15 miles on the freeway, exited, and entered the parking lot of the dealership. I went over a speed bump at about 5-7mph and felt a clunk, with a grinding sound and the car pulled to the right. I got out of the truck and found the front passenger wheel was hanging off with only the lower connections attaching it to the frame. (Control arm maybe?). The service department worker was right there when it happened. He told me they have been having issues with the leveling kits on 2020 GMC sierras causing this issue, especially on the right side. He said that this was not the first that he had seen. Two other people at the dealership mentioned the same thing. I was never notified of the potential failure and possible catastrophic consequences. I contacted GMC who's "Product Allegation" department told me they could not investigate because the truck was repaired at the dealership. They didn't even review the photos I had sent them.