*Median odometer reading when the problem happened, where owners gave one. One complaint can name several problem areas.
Service brakes
Driving down road and heard load screeching noise then when preparing to stop the brake felt like pushing on a brick wall and almost got hit after pulling into highway. The vacuum booster pump was found to have been sheared off engine.
Oct 16, 2026Power train
On many occasions, over several years of ownership, ''NEW in 2018, the trans has had violent shift Problems. I could only find 1, ONE instance where a person was "injured'' by ANY of the GM 8L transmissions. My neck is hurting Now. I'm compelled to do this for Others who been Scammed by GM as they still sell a 8 speed rewrapped. I can't believe this has been protected against being called a SAFETY ISSUE By any Gov. agency. I got my truck in Retirement and Know I can't and won't Tow a Trailer or Boat Like I planned to. If I cause a wreck, Knowing the Defect, I will be held Responsible, Not GM LLC. It just did something new on 7/23/26. it stuck I a mid range gear and wouldn't shift, I Bumped…
Aug 10, 2001Unknown or other
The truck have a bad shudder that can shake you off the road. They know about the issue because its been an issue with there vehicles. I have a 2020 colorado also with this dangerous issue.
Jun 19, 2020Air bagsCrash1 injury
Crash on 5/5 rear ended car - airbags did not deploy . Received concussion and neck injury.
May 5, 2026Vehicle speed control
The warning light is saying engine power reduced having to do with the DEF system
Mar 25, 2026Power train
This is a known problem with GMC and Chevy trucks, known as the Rumble. At approximately 45mph and up, the truck feels like itâs going over rumble strip and the back end is slipping. This causes the steering wheel and truck to shake. It could result in the loss of control if it gets too bad. I took it in for diagnostic testing, which confirmed that it was the transmission. They recommended a triple flush and replacement of the transmission fluid, as well as a computer upgrade. I had them complete the recommended service. As of right now it seems to have helped. But if it returns the next steps is to replace the torque converter. There were no warning lights, nor messages indicating an…
Feb 16, 2026Power train
The contact owns a 2018 GMC Canyon. The contact stated that while driving in the snow, the 4WD function became inoperable, and the vehicle lost traction and started skidding. The "Service 4WD" message was displayed. The vehicle was taken to a dealer where it was determined that a chip inside of the casing of the 4WD feature was inoperable. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 40,000.
Dec 1, 2023 · 40,000 milesPower train
The contact owns a 2018 GMC Canyon. The contact stated that while driving at an undisclosed speed, there was an abnormal knocking sound coming from the engine compartment. No warning lights were illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the transmission. The contact was informed that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 34,929.
Nov 12, 2025 · 34,929 miles
Owner complaints are submitted to NHTSA by the public and are not verified. Shown as filed (NHTSA removes personal details); long reports are shortened.