GMC Complaints

Noticed the bed of my truck was touching the cab when looking under truck the frame is total structural failure rusted all the way threw on the driver side and beyond

OnStar module in-operable, bought the vehicle expecting the system to work as it is another safety feature in case of an accident. Technical support will not continue to respond when contacted. Will not assist with any technical support to diagnose issue.

Driving approximately 70mph on interstate. Came to a slight hill, gently applied brake pressure, brakes become hard to apply/would not apply. After diagnostics, found Brake Vacuum Pump with damaged fins.

Due to negligence of gmc wright of wexford during the replacement of 3rd new transmission they did not clamp a hose together causing coolant to leak and my thermostat to come on n off. Causing further damage to my vehicle

Part number 15816854 and says replaced by 15756444 cab pressure releaf vent rubber degrades and is open allowing exhaust fumes to go into cab of vehicle they are located above taillights of vehicle while driving sucks exhaust fumes into vehicle no parts available to fix vehicle and not normal serviceable part

Dash cluster lights that show how many miles are on the vehicle and PRND do not light up.

On 15 Aug 2025, I was driving this vehicle on Rte 151 in raccoon township with my 2 children when the vehicle suddenly and unexpectedly experienced a “loss of propulsion” with a corresponding uncommanded shift to “neutral”. Attempts to shift the car back into drive were met with a “parameters not safe” caution. I was fortunate enough that the vehicle behind me was able to slow and an accident was avoided. The thought that this could have happened with my family on the highway, during adverse conditions, or any other scenario is frightening to say the least. Other owners of affected models weren’t as fortunate.

Steering wheel will not lock when in park and the vehicle is turned off. This is referring to the Steering/Shifter Recall (13V-001).

While my wife was driving to pickup my son from school, the vehicle was stopped at a stoplight and the engine turned off approximately 1 mile after departing the house. After getting the vehicle towed to the dealership because it wouldn’t start, it was determined by the dealership that the engine was seized. The vehicle has 60,500 miles on it and is driven by a suburban woman and has always had all maintenance done at the dealership. The vehicle is parked in our driveway and there are no signs of oil leaks or anything else that would indicate a potential engine failure. This VIN was not recalled with the larger GMC 6.2L engine failure recall, however other 2021 model years were recalled. Recommend immediate expansion of recall due to the unforeseen engine failure while driving with no previous warning lights (oil or check engine) or other indications prior to seizing. This experience indicates that the initial recall was not sufficient enough to locate and identify all of the 6.2L engines affected by the poor quality control issues at GMC.

My OnStar module failed after 2 years, causing my check engine light to illuminate. The replacement has been unavailable for a year due to the large number of consumers fighting for a limited supply of replacement parts. This has placed myself and my passengers at undo risk as my ability to access the key safety features associated with OnStar, including but not limited to: crash detection, emergency notifications, and location assistance. This problem was first diagnosed at Bristol Chevrolet and then later inspected and confirmed at Crabtree GMC.