2025 GMC Canyon Complaint Log

On [XXX], at approximately 4:10 PM, I was at the McDonald’s drive-through located at [XXX] and [XXX] in Springfield, Missouri. I was stopped at the final service window. As I pulled away from the window, I approached a 90-degree left turn heading south. I removed my foot from the accelerator pedal to allow the truck to coast slowly around the corner, as the area is heavily pedestrian and requires caution. While coasting with my foot completely off the gas pedal, the truck suddenly and rapidly began to accelerate on its own. I immediately applied the brakes, and the unintended acceleration stopped right away. At that point, I called Thompson GMC in Springfield, Missouri, at 4:17 PM to report the incident. This was the second time this has occurred. The first incident happened several months ago on [XXX] north of Strafford, Missouri. While navigating a curve, I lifted my foot off the accelerator to coast, and the truck again experienced sudden, hard acceleration. I quickly applied the brakes, and the acceleration stopped immediately. I called Thompson GMC at that time as well. They advised me that I could bring the vehicle in for inspection, but without a check engine light or warning light illuminated, and without the issue occurring while a technician was driving, it might be difficult to diagnose. I did not bring the vehicle in after the first incident. Yesterday, a Thompson GMC employee scheduled an appointment for me to have the truck inspected. No warning lights or check engine lights were illuminated on the dashboard during either incident. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Upper radiator hose leaking coolant

Front passenger heated seat caused severe burns to passenger back upper thigh area while using. Passenger was wearing ankle length sweat pants during ride.

The contact owns a 2025 GMC Canyon. The contact stated that while the vehicle was parked, the contact discovered a coolant leak underneath the front of the vehicle. No warning lights were illuminated. The vehicle was taken to a dealer to be diagnosed; however, the vehicle had not yet been diagnosed. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 13,500.

On Sunday, November 16, 2025, my vehicle, which had only 2,004 miles on the odometer, experienced a catastrophic failure of its braking system. The warning lights illuminated, and I received a diagnostic alert text message from OnStar stating that the driver’s side rear tire needed air. Subsequently, the dashboard displayed a brake failure warning, advising me to proceed with caution as the braking system was inoperative. I drove the vehicle home and then took it to a nearby Buick GMC dealership for repairs. I dropped the keys into the overnight box and returned to the dealership the next morning. I was informed that a technician would contact me. On Wednesday, November 18, 2025, at 3:00 PM, I received a call informing me that the braking system was indeed malfunctioning. The technician mentioned that it would take approximately 48 hours to obtain the necessary parts; however, there was a supply chain issue that could delay repairs for potentially 30 days or longer. The vehicle was purchased on April 18, 2025, and had only 2,004 miles on it at the time of the incident.

ALREADY SUBMITTED COMPLAINT BUT NEEDED TO EDIT MILEAGE. *ORIGINAL COMPLAINT NUMBER-11683406. COMPONENT SYSTEM FAILURE-MASTER BRAKE CYLINDER. *SAFETY-PUT AT RISK AS AFTER GOING TO THE DEALERSHIP ON 8/23/25 SERVICE ADVISOR LET ME LEAVE WITH VEHICLE AND SAID IT WAS PROBALY SAFE TO DRIVE AND PROBABLY AN ELECTRICAL GLITCH. THERE WAS NO WARNING/ALERTS PRIOR TO 8/23/25. TAKING THE SERVICE ADVISORS ADVICE I DROVE IT THAT WEEKEND NOT REALIZING MY BRAKES COULD FAIL ANYTIME. TOOK BACK TO DEALERSHIP ON MONDAY 8/25/25. GMC CERTIFIED MECHANIC CONFIRMED IT WAS THE BRAKE SYSTEM CYLINDER. PART IS ON BACKORDER FOR THE FORSEEABLE FUTURE. GIVEN THE MILEAGE AND BEING BRAND NEWAND NOT HAVING THE PART POSSIBLY FOR MORE THAN 30 DAYS, I FEEL AS IF I SHOULD BE GIVEN ANOTHER VEHICLE AS I HAD PAID OFF THE ONE I AM SPEAKING OF 2 WEEKS AGO. ALSO, I THINK THIS WOULD FALL UNDER THE LEMON LAW IF THE PART GOES BEYOND 30 DAYS FROM BEING DELIVERED TO DEALERSHIP AND TRUCK BEING FIXED. MILES ON TRUCK WHEN FIRST OCCURED WAS 2371, WHEN LEFT AT DEALERSHIP ON 8/25/25, MILEAGE WAS AT 2417. HAVE PICTURES CONFIRMING MILEAGE AND ALERTS. CALLED DEALERSHIP ON 8/27/25 ASKING FOR A WORKORDER AS I WAS NOT GIVEN ONE. STATING EVERYTHING THAT HAS BEEN TALKED ABOUT WITH MY VEHICLE WITH THE SERVICE ADVISOR AND MECHANIC. I WAS TOLD FROM SOMEONE WHO CALLED ME THIS MORNING AFTER FIRST SUBMITTING MY FIRST SUBMISSION THAT I NEED THAT WORKORDER IF THINGS PROGRESS FURTHER.

*COMPONENT SYSTEM FAILURE- MASTER BRAKE CYLINDER *SAFETY PUT AT RISK - AS BRAKE SYSTEM FAILURE MEANS THE BRAKES WERE NOT WORKING AS THEY SHOULD. *PROBLEM HAS BEEN CONFIRMED BY GMC AND THE DEALERSHIP AS A KNOWN ISSUE IN NEW VEHICLES. *THERE WAS NO WARNING OR ALERTS PRIOR TO THE DAY 8/23/25. ON THAT DAY WAS THE FIRST WARNING LIGHTS I SEEN. *PART ON BACKORDER FOR THE FORSEEABLE FUTURE. GIVEN THE MILEAGE AND BEING BRAND NEW AND NOT HAVING THE PART POSSIBLY FOR MORE THAN 30 DAYS I FEEL AS IF I SHOULD BE GIVEN ANOTHER VEHICLE AS I THINK IT WOULD FALL UNDER THE LEMON LAW? 2025 GMC CANYON AT4 MILES-2,417

There is a phantom chime that happens intermittently at all driving conditions when close to or below 20 degrees F. (stop and go, highway, back roads, dry weather, wet weather, clear weather, etc.). This chime does not produce any warning on the driver displays. This is dangerous because it causes the driver to look away from the road to figure out what the warning is. But no warning being shown causes one to look around for the issue. Again, taking eyes off of the road even longer. Chimes can happen a dozen times on a drive, or none at all. completely random but only happens in the temperature range listed above. This is reported on numerous forums for the current generation canyons and Colorados. This has been consistent with winter of 2025 and now winter of 2026.