2021 GMC Yukon Suspension Problems

Air bag suspension does not work in sub freezing temperatures. Vehicle bounces up and down excessively and is extremely unstable and unsafe to drive at any speed. Vehicle speed was limited to 56 mph. Dealer stated that this is a known flaw but not recall has been issued. This is a design flaw that GMC should be responsible to correct.

In 2024, while the vehicle was still under warranty, we brought it to our GM dealer due to an air suspension fault. The problem typically occurs in extreme cold weather, and following that visit, we did not experience further issues during the remainder of that winter as it was never that cold again. However, the following winter the same issue returned and was diagnosed yet again, and this year we are again experiencing the identical problem with the same diagnostic code which has been diagnosed by 2 dealers and a private mechanic in the last week. It has since become clear that the underlying issue was never properly repaired during the 2024 warranty visit. We recently learned that approximately 3.5 weeks after our 2024 service appointment, GM released a service bulletin outlining the correct repair procedure for this exact issue. We were not notified of this bulletin by the original servicing dealer. This information only came to our attention when we brought the vehicle to a GM dealer last week, where the issue was properly diagnosed and now they are refusing to fix it without us paying $4300 even though it was brought to their attention in 2024 while under warranty. A failed air suspension presents a safety concern, not merely a ride-comfort issue. When the system fails, the vehicle may sit unevenly or at an incorrect ride height, which can affect vehicle stability, steering response, braking geometry, and traction—particularly in cold weather and at highway speeds. Because the failure is intermittent and temperature-related, it is unpredictable and increases the risk of loss of control. The vehicle is not operating as designed when the air suspension is compromised. GM knows about this issue as they did indeed issue a bulletin that covers our vehicle and this was done when my car was still under warranty, but it was not brought to our attention that it existed until this year after the car's warranty was up. 2 seal kits, air springs and the struts!

The contact owns a 2021 GMC Yukon. The contact stated that the service suspension and low oil warning lights were illuminated. The contact stated that the engine oil had leaked out of the vehicle. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The local dealer was contacted. The vehicle was not diagnosed or repaired. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The failure mileage was approximately 83,000. VIN tool confirms parts not available.

My blind spot warning light and signal doesnt work all the time. for example, if a pass a car, or a car passes me at a speed of more than 5 miles per hour, there is no notification from the blind spot warning light in the mirror, or an audalble signale either. i have taken the car to the GMC dealership 3 times and i was told that is normal, and nothing is wrong. I own other GMC models and i have never experianced this intermitant issue.

WE WERE COMING BACK FROM A TRIP WITH MY CHILDREN AND THIS VEHICLE WAS BARELY 2 WEEKS OLD WITH 0 MILES AND WE WERE ON A HIGHWAY WHEN ALL THE EMERGENCY LIGHTS ON THE DASH WENT OFF. IT WAS FLAGGING THE ELECTRICAL SYSTEM, THE ENGINE, THE BRAKES. HONESTLY ALL THE LIGHTS POSSIBLE WENT OFF. THE VEHICLE WAS LAGGING AND IT FELT FORCE WHEN WE PUSHED ON THE GAS. OUR HANDS WERE GRIPPING THE STEERING WHEEL TO KEEP IT IN LANE TILL WE COULD GET OFF.