There are 5 owner-reported brakes complaints for the 2021 GMC Yukonin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
The contact owns a 2021 GMC Yukon. The contact stated while driving at an undisclosed speed, the engine seized. The brake pad sensor warning light illuminated. In addition, the contact stated that the vehicle continued to roll forward. The contact was able to drive the vehicle to the shoulder of the road. The contact stated while attempting to restart the vehicle, the vehicle failed to start. The contact stated that a nearby driver assisted by providing a jumpstart. The vehicle was driven to the residence. The vehicle was then taken to an independent mechanic where it was diagnosed with alternator failure. The contact stated that the vehicle was previously taken to two independent mechanics, and the vehicle was diagnosed with alternator failure. The dealer was made aware of the failure. The contact was informed that the failure was a known failure with similar vehicles. The manufacturer was made aware of the failure with the alternator and the brake pad sensor. The contact was informed that the repairs were not covered under warranty or recall. The failure mileage was approximately 95,000.
The component that failed was the Camshaft and Lifters in the Engine - My safety and others was put at risk because while going 45mph, I suddenly lost forward moving power and couldn't go faster than 35 - braking power was sketchy and only responsive when pumped. - I received the following errors on my dash "Service ESC" "Service Traction Control", Reduced Acceleration Drive with Care", "Forward Collision System Unavailable", "Service Emission System" the vehicle would shudder violently- this problem has been confirmed and corrected at a huge expense (see bill) -
The contact owns a 2021 GMC Yukon. The contact stated that while driving at an undisclosed speed and completing a turn, the forward warning collision system alarm sounded, but the vehicle failed to activate automatic emergency braking. As a result, the vehicle collided with another vehicle ahead. The air bags did not deploy. No warning lights were illuminated. The vehicle was taken to an independent mechanic, who diagnosed a failure with the ABS. The vehicle was not repaired. A police report was not filed, and no injuries were reported. The manufacturer was not notified of the failure. The failure mileage was unknown.
The contact owns a 2021 GMC Yukon. The contact stated that while driving at an undisclosed speed, the odometer was inoperable. There was an abnormal odor of fuel while starting the vehicle. The parking brake and TPMS warning lights were illuminated and flashing. The parking brake was inoperable. Additionally, the seat belts were inoperable. The contact stated that there was a cut in brake line. The vehicle was taken to the local dealer where it was diagnosed and determined that the brake master cylinder needed to be replaced. The vehicle was repaired but the failure persisted. The manufacturer was contacted but provided no additional assistance. The failure mileage was approximately 60,000.
On Friday October 22, 2021 around 7:20am as I was driving my children to school I was driving around 40 mph when suddenly I received an alert on the dashboard saying “brake system fail”, I then proceeded to brake to make sure my breaks were working when I noticed they did not work. I then started pumping the gas pedal repeatedly to make the vehicle stop. My car was not stopping and my children and I panicked and started crying. As I was getting closer to a vehicle and ready to crash I swerved the vehicle to the right where it was just an empty lot. I continue to press and pump the brakes until the vehicle came to a complete stop. I took pictures of the dash board once the vehicle was completely off. My Vehicle was towed to my house shortly after. I refuse to drive that vehicle after the terrible experience that jeopardize the life of my children and myself. We have suffered emotional distress.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 25, 2026