2019 GMC Canyon Powertrain & Transmission Problems

Formal Complaint to NHTSA: 2019 GMC Canyon Transmission Issue To Whom It May Concern at the National Highway Traffic Safety Administration (NHTSA): I am writing to formally report a recurring and dangerous transmission issue in my 2019 GMC Canyon, and to request that NHTSA open an investigation into why General Motors has not issued a safety recall — despite widespread complaints and technical service bulletins. My vehicle exhibits jerking, hesitation, slipping, and hard shifting — especially during acceleration or when moving from a complete stop. These symptoms are consistent with hundreds of other consumer reports across forums, NHTSA complaints, and class-action lawsuits tied to GM’s 8L45 8-speed automatic transmission. I was quoted approximately $5,700 for a transmission repair and $8,800 for replacement. This problem is not simply an inconvenience or comfort issue. Hesitation and sudden surges in acceleration pose a legitimate safety hazard, especially when merging onto highways, pulling into traffic, or driving on slippery roads. At times, I’ve experienced delayed throttle response and unexpected lurching — which could easily result in a rear-end collision or intersection mishap. Despite the well-documented nature of this defect, GM has not recalled these transmissions — and owners are left to bear the financial burden of expensive repairs on a known design flaw. That is unacceptable. NHTSA’s mandate is to protect consumers from safety-related defects. In my view, and in the experience of many other drivers, this transmission issue meets the criteria for a recall: - It affects safe operation and control of the vehicle - It has been confirmed by internal GM service documentation - It recurs even after manufacturer-prescribed remedies - It places drivers, passengers, and others at risk Please consider this a formal request to investigate this matter and hold General Motors accountable for a recall or reimbursement program for affected consumers. Joanne Holstein

Noticed oil on snow in driveway. Upon inspection, noted that engine oil cooler pipe is corroded-through and oil, under pressure, is leaking when engine is running and blowing back onto hot engine components. Also noted smoke from under hood/engine compartment.

The vehicle hesitates and shifts harshly as if it will stall at low speed acceleration leaving my driveway and when going forward from a full stop at red light to green. Very jerky ride, uneven acceleration, fear of stalling.

Truck jerks and makes loud noises when going up incline when transmission is shifting and constantly shifting even at low speed.

TRANSMISSION SLIPS ON INCLINES. HAVE TAKEN IT TO DEALER SEVERAL TIMES . THEY CHANGED FLUID AND IT STILL SLIPS ON INCLINES. DOESN'T SLIP ALL OF THE TIME, BUT DOES STILL SLIP! THIS STARTED APPROX. 2 MONTHS AFTER PURCHASE. BOUGHT NEW.

Transmission shifting issues. The transmission will shift very slowly (engine revs high and vehicle lurches) when driving the truck each morning. I reported the issue to the dealership within 0ne month of purchasing the truck in 2019 and again in 2024. The dealership stated there is nothing wrong with the transmission. The transmission is now starting to slip at low/moderate speeds when accelerating. The vehicle has less than 50,000 miles.