GMC Canyon brake failure problems

Filed Nov 9, 2026 · Brakes, Engine · AZ

While driving my 2021 GMC Canyon (current mileage: 78,465), the engine-driven brake booster vacuum pump drive gear housing catastrophically shattered without warning. This structural component explosion caused an immediate, sudden loss of power braking assist while the vehicle was in motion, creating a severe and dangerous safety hazard on the road. Upon a professional diagnostic tear-down, it was confirmed that the self-destruction of the vacuum pump violently introduced heavy metallic shrapnel throughout the cylinder head and engine oiling system. The entire engine block is now heavily contaminated with metal debris, requiring a complete engine replacement estimated at $14,000. This is a severe, premature failure of a critical safety component driven directly by the engine's camshaft. General Motors is facing ongoing class-action litigation regarding these exact mechanical vacuum pump explosions, which pose a dual threat of total power brake failure and complete engine destruction. I am logging this complaint to urge the federal safety agency to investigate this systemic material defect before it causes a fatal accident due to sudden brake loss.

Filed Jan 26, 2026 · Brakes · MO

Upon starting the vehicle, I got multiple warning lights. The most important was brake failure. I had no brake function. I took it to the dealer and they replaced the brake module after 3 days.

Filed Dec 9, 2025 · Brakes, Driver assistance · FL

The contact called on behalf of her son who owned a 2022 GMC Canyon. The contact stated while her son was driving at an undisclosed speed, the brake pedal was depressed, and the brakes failed to engage. Additionally, the infotainment screen was inoperable. The front camera module warning light was illuminated. The vehicle was taken to an independent mechanic where it was diagnosed and determined that the front camera module needed to be replaced. The dealer made the contact aware of the federal safety agency Campaign Number: 24V133000 (ELECTRICAL SYSTEM, FORWARD COLLISION AVOIDANCE); however, the VIN was not included in the recal. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the federal safety agency Hotline to report the failure. The failure mileage was unknown.

Filed Nov 25, 2025 · Brakes · NY

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.

Filed Nov 7, 2025 · Acceleration, Brakes · CO

While driving at 70–75 mph on an interstate, my vehicle suddenly displayed a “Brake Failure” warning and limited speed to 62 mph. Power steering failed completely, and braking became ineffective despite hard pedal pressure. Multiple warnings followed: ABS, engine, and others. I was in heavy traffic with vehicles at full speed. Loss of braking and steering control forced me to coast across lanes to the shoulder, narrowly avoiding collision. My safety and that of others was at extreme risk. After stopping, I turned the vehicle off for ~30 seconds. Upon restart, all systems returned to normal—no warnings or issues. This indicates a transient software malfunction, not mechanical failure. No prior warnings or symptoms occurred. The problem has not been reproduced or confirmed by a dealer/service center. I have not scanned or inspected the vehicle. It has not been examined by the manufacturer, police, or insurance. The vehicle is in my possession and available for inspection upon request.

Filed Nov 7, 2025 · Acceleration, Brakes · CO

While driving at 70–75 mph on an interstate, my vehicle suddenly displayed a “Brake Failure” warning and limited speed to 62 mph. Power steering failed completely, and braking became ineffective despite hard pedal pressure. Multiple warnings followed: ABS, engine, and others. I was in heavy traffic with vehicles at full speed. Loss of braking and steering control forced me to coast across lanes to the shoulder, narrowly avoiding collision. My safety and that of others was at extreme risk. After stopping, I turned the vehicle off for ~30 seconds. Upon restart, all systems returned to normal—no warnings or issues. This indicates a transient software malfunction, not mechanical failure. No prior warnings or symptoms occurred. The problem has not been reproduced or confirmed by a dealer/service center. I have not scanned or inspected the vehicle. It has not been examined by the manufacturer, police, or insurance. The vehicle is in my possession and available for inspection upon request.

Filed Aug 25, 2025 · Brakes, Driver assistance · MO

Vehicle brakes stopped working while driving. Dash board lit up and stated system brake failure. Also stated “do not exceed 43mph”

Filed Dec 28, 2024 · Brakes, Electrical · AK

Battery dies during vehicle update spontanteniouly. After jumoing vehicle to start it all systems will not return to normal causing brakes not to function normally. I jumped my vehicle after one system update and brakes failed to engage almost causing an acident. these vehicles should not be on the road due to the software safety flaws. GMC is aware of this and still have no fix for the problem. There are numerous accounts of this happening to this vehicle on forums and solcial media.

Filed Nov 29, 2023 · Brakes · NY

Vehicle only two months old with 2000 miles. Service engine light and brake assist service light activated. GMC dealer states brake master cyclinder failure and vehicle should not be driven. Vehicle left at dealer while awaiting replacement master cyclinder. Unknown if this is a widespread problem causing brake failures in GMC and Chevy new model Canyons and Colorados.

Filed Jun 17, 2023 · Brakes, Steering · CA

Transmission shifting really hard, has problem shifting from low gear shaking when brakes are applied makes loud noises when you go reverse to park and park to any gear Driving home lost power Steering and had to pull of freeway This truck has already been in the dealer for 7 other warranty issues This will be the 4th issue with the transmission!!!! It has already been fixed once before on the transmission now again 2 Top Ends already now more transmission issues again We have been waiting for a new transmission for my 2018 sierra for over 3 months I have lost Complete faith that GMC really cares about the safety of people I have 2 LEMONS in my driveway just sitting The contact stated GM has not resolved the issue and there are no brakes which is a huge safety issue.