Consumer Safety Complaints

Incident date: Feb 16, 2026

The contact owns a 2017 GMC Terrain. The contact stated that after the vehicle was taken to a local car wash, while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the residence; however, the next day, the vehicle hesitated while starting. The message "Stabilizer - Power to Engine Reduced" was displayed. The vehicle was taken to a local indepen... Read more

Incident date: Feb 26, 2026

I stopped at a red light in the middle of a 50 mph intersection when the light turned green The engine completely shut off, and it didn’t want to turn back on. I was stuck in the middle of the intersection in a very high risk area, putting myself and other drivers at risk. OnStar diagnostics didn’t report any issues with the truck. According to their diagnostics, everything should have been ru... Read more

Incident date: Feb 26, 2026

I stopped at a red light in the middle of a 50 mph intersection when the light turned green The engine completely shut off, and it didn’t want to turn back on. I was stuck in the middle of the intersection in a very high risk area, putting myself and other drivers at risk. OnStar diagnostics didn’t report any issues with the truck. According to their diagnostics, everything should have been ru... Read more

Incident date: Feb 25, 2026

The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at various speeds, the steering wheel became stiff and difficult to steer to the left or the right. The power steering and check engine warning lights were illuminated. The vehicle was towed to a local dealer, where it was diagnosed with a corroded body ground strap. The error codes were cleared, and a test drive was pe... Read more

Incident date: Feb 25, 2026

The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at various speeds, the steering wheel became stiff and difficult to steer to the left or the right. The power steering and check engine warning lights were illuminated. The vehicle was towed to a local dealer, where it was diagnosed with a corroded body ground strap. The error codes were cleared, and a test drive was pe... Read more

Incident date: Dec 17, 2025

The contact owns a 2025 GMC Sierra 1500. The contact stated that while the defroster was activated to clear the windshield, the blower vents on the passenger’s side started making an abnormal hissing sound, and air produced by the blower motor decreased and was inadequate to clear the windshield. There was no warning light illuminated. The contact stated that the failure occurred while there was... Read more

Incident date: Feb 2, 2026

Vehicle is shifting hard when switching gears. Typical with the recall and the valve body being the issue. Dealership is saying it is not covered by recall.

Incident date: Jul 10, 2024

Misfiring due to DFM which is a common issue. Running a scan confirmed. I have installed a AFM/DFM disabler which seems to fix the issue.

Incident date: Feb 26, 2026

While the 2017 GMC Sierra was warming up via remote start, I noticed a smell of smoke as I walked by the passenger side of the truck. Then I heard a loud bang as I was walking around the rear of the truck. As I entered the truck from the driver's door I saw the back window, passenger side, shattered. The vehicle was then turned off. According to our dealership the vehicle was looked at under recal... Read more

Incident date: Jan 1, 2026

The contact owns a 2019 GMC Acadia. The contact stated that while attempting to park the vehicle, the gear shifter failed to shift into park(P). The vehicle failed to turn off, with the message "Shift to Park" displayed with an audible chime. The contact was forced to move the gear shifter back and forth before it was recognized that the transmission was in park(P). A dealer was notified of the fa... Read more

Incident date: Feb 1, 2022

My 2019 Acadia often will not turn off because it has a Shift to Park issue. Apparently it is caused by a faulty microswitch in the shifter assembly that fails to signal the Body Control Module when in park, leading to a persistent warning message, inability to turn off the vehicle and battery drain. It has been going on for at least 4 years. It appears there is a recall for this problem but wh... Read more

Incident date: Feb 1, 2022

My 2019 Acadia often will not turn off because it has a Shift to Park issue. Apparently it is caused by a faulty microswitch in the shifter assembly that fails to signal the Body Control Module when in park, leading to a persistent warning message, inability to turn off the vehicle and battery drain. It has been going on for at least 4 years. It appears there is a recall for this problem but wh... Read more

Incident date: Feb 23, 2026

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); and the vehicle was taken to the dealer, where the contact was informed that no repair was needed, upon inspection. The contact stated that while driving at 70 MPH, the vehicle stalled. There was no warning light illuminated. The contact was able to pull over... Read more

Incident date: Jul 14, 2025

The contact owns a 2023 GMC Acadia. The contact stated that with the stop/start feature activated and while attempting to park the vehicle, the accelerator pedal was slightly pressed in order to slowly move the vehicle forward. The vehicle suddenly experienced unintended acceleration and drove forward, over a curb, and crashed into a tree. During the crash, the front end of the vehicle sustained s... Read more

Crash

Incident date: Jul 14, 2025

The contact owns a 2023 GMC Acadia. The contact stated that with the stop/start feature activated and while attempting to park the vehicle, the accelerator pedal was slightly pressed in order to slowly move the vehicle forward. The vehicle suddenly experienced unintended acceleration and drove forward, over a curb, and crashed into a tree. During the crash, the front end of the vehicle sustained s... Read more

Crash

Incident date: Feb 25, 2026

Following engine replacement per NHTSA for 6.2l GMC engine. I am submitting a safety complaint regarding my 2022 GMC Sierra 1500 Denali (refresh body style). The vehicle has experienced repeated failures of driver-assist features and safety system warnings, including: Dash messages: “Lane Keeping Assist System Unavailable” and “Service Safety Restraint System.” When the fault occurs, dr... Read more

Incident date: Feb 25, 2026

Following engine replacement per NHTSA for 6.2l GMC engine. I am submitting a safety complaint regarding my 2022 GMC Sierra 1500 Denali (refresh body style). The vehicle has experienced repeated failures of driver-assist features and safety system warnings, including: Dash messages: “Lane Keeping Assist System Unavailable” and “Service Safety Restraint System.” When the fault occurs, dr... Read more

Incident date: Feb 25, 2026

Following engine replacement per NHTSA for 6.2l GMC engine. I am submitting a safety complaint regarding my 2022 GMC Sierra 1500 Denali (refresh body style). The vehicle has experienced repeated failures of driver-assist features and safety system warnings, including: Dash messages: “Lane Keeping Assist System Unavailable” and “Service Safety Restraint System.” When the fault occurs, dr... Read more

Incident date: Feb 16, 2026

Front grill deflector detached from vehicle when traveling on highway. This is a recall repair for the same issue. There were no warning lamps.

Incident date: Feb 19, 2026

Gateway system module failed during the L87 recall service.The major L87 recall (ECM update) is a major, high-load software update that frequently causes the Gateway Module to "brick" or stop communicating during the update process resulting in failed module immediately following the service. (TSB) speak to this, The L87 recall is a safety-critical repair, a failure of a module directly caused by ... Read more

Incident date: Dec 2, 2025

The contact owns a 2015 GMC Yukon. The contact stated that while in reverse(R), the vehicle jerked while depressing the accelerator pedal. There was no warning light illuminated. The contact became aware of fluid spots on the driveway while the vehicle was parked. The vehicle was taken to an independent mechanic who discovered a leak in the transmission oil cooler line. The dealer then informed th... Read more

Incident date: Feb 4, 2026

Vehicle developed hesitation. Message: "Reduced Acceleration Drive with Caution" Check Engine light comes on, fortunately near home. Scanner showed "PO 0747 Transmission Valve #1 stuck open." Research shows this is a common problem and a safety issue and can leave driver stranded or worse. Had vehicle "serviced" at selling dealer, but they did not touch the transmission. Said they drove it ar... Read more

Incident date: Feb 24, 2026

Motor seized while driving

Incident date: Feb 21, 2026

While driving I received a "service brake assist system" alert and a check engine light. After this happened the brakes were extremely hard to press. I had to put my entire weight on the breaks to stop the car. The brake "assist" feature really is making the brakes functional. We were able to safely get to the side of the road. We found a vacuum pump failed and needed to be replaced. There was no ... Read more

Incident date: Feb 26, 2026

My gmc sierra Denali 2022 equipped with the 6.2 motor locked up while I was driving pulling me out of the road.

Incident date: Sep 9, 2025

Engine coolant control valve failure. This is a widespread issue on 2020-2022 3.0L Diesel trucks and it hasn’t been addressed by GM, leaving owners to pay out of pocket for a faulty part.

Incident date: Jan 24, 2026

Vehicle will not shift out of park, despite replacing the valve body, putting in a new battery, and transmission fluid. It has been this way since mid January. The codes don’t make sense and there is no current recall, nor have we had this vehicle for very long. It has 48,000 miles on it and is having this issue. Very disappointed.

Incident date: Feb 24, 2026

Vehicle exhibited a sudden loss of power, dash screen stated a restart of the vehicle was needed. I was able to coast into a neighborhood upon attempting to restart the vehicle nothing would happen and it would not even attempt to turn over, proceeded to contact onstar for roadside assistance, vehicle taken to nearest GMC dealership where it was determined to have engine failure and a new engine ... Read more

Incident date: Nov 20, 2025

The contact owns a 2025 GMC Sierra 1500. The contact stated that while stopped at a traffic light, the gear shifter was shifted to park(P) and the vehicle stalled. The message "START Engine" was displayed. The vehicle was restarted, and the Auto START/STOP feature was disabled by pressing the "A" inside an orange circle. The contact stated that on another occasion while reversing into the driveway... Read more

Incident date: Nov 20, 2025

The contact owns a 2025 GMC Sierra 1500. The contact stated that while stopped at a traffic light, the gear shifter was shifted to park(P) and the vehicle stalled. The message "START Engine" was displayed. The vehicle was restarted, and the Auto START/STOP feature was disabled by pressing the "A" inside an orange circle. The contact stated that on another occasion while reversing into the driveway... Read more

Incident date: Feb 13, 2020

The oil is depleting every month from the vehicle. Every 2-3 weeks I have to put oil in the vehicle because the oil is being absorbed. Is there a recall on this problem.

Incident date: Feb 22, 2026

While driving the vehicle I received dash warnings of temperature rise. Pulled over and saw a large coolant leak coming from right side of engine compartment. Towed to dealership. Dealership informed me that coolant hose coming from heater core was routed by the manufacturer so that it rubbed on the frame. Dealer indicated problem persists on all vehicles and no given, other than replacing the hos... Read more

Incident date: Sep 15, 2025

The contact owns a 2017 GMC Canyon. The contact stated that while operating the vehicle, the ABS and traction control warning lights illuminated, and the message " Check Trailer Brakes” was displayed. While driving at an undisclosed speed, the braking system randomly activated, causing the vehicle to abruptly decelerate. On several occasions while depressing the brake pedal, the vehicle failed t... Read more

Incident date: Sep 15, 2025

The contact owns a 2017 GMC Canyon. The contact stated that while operating the vehicle, the ABS and traction control warning lights illuminated, and the message " Check Trailer Brakes” was displayed. While driving at an undisclosed speed, the braking system randomly activated, causing the vehicle to abruptly decelerate. On several occasions while depressing the brake pedal, the vehicle failed t... Read more

Incident date: Jan 15, 2026

The upper radiator hose on some huge percentage of these trucks fail (mine has failed at just over 37K miles). You can check the Colorado Chevy and GMC Canyon forums, youtube, Facebook, etc., et al, and find plenty of instances where this has failed. As this is the cooling system, it can cause the engine to overheat and potentially ruin the engine. The flaw seems to be an engineering issue with th... Read more

Incident date: Feb 21, 2026

I remote started my truck, and when I got to it there was smoke and a flame coming from the rear power window. The remote start activates the rear defrosters, which started the electrical issues. I shut off the engine, and a loud pop followed, which was the shattering of the driver side rear window. The flame went out, and could have easily ignited the tarp covering the truck bed. There were no wa... Read more

Fire

Incident date: Feb 7, 2026

The contact owns a 2026 GMC Sierra 1500. The contact stated that after purchasing the vehicle, there was no Owner’s Manual in the vehicle. The contact inquired about the Owner’s Manual and was informed by the dealer that an Owner’s Manual was no longer printed. The contact checked online and became aware of FMVSS 225, which was related to the Owner’s Manuals for similar vehicles. The conta... Read more

Incident date: Feb 7, 2026

While driving on the interstate the top part of the grill flew off into following traffic.

Incident date: Dec 15, 2025

At approximately 29,000 miles, my 2023 GMC Sierra 1500 experienced a transmission failure. The transmission began slipping, shifting improperly, and operating unpredictably during normal driving conditions. This occurred without warning and well below the expected lifespan of a transmission, indicating a serious defect rather than normal wear or maintenance-related issues. The vehicle became unre... Read more

Incident date: Feb 10, 2026

coolant control valve failed, truck cannot be driven due to overheating, Dealer has said due the national backorder, it could be 2 months before they receive the replacement part. There is a significant national backorder on the engine coolant flow control valve for 2020–2025 GMC Sierra and Chevrolet Silverado trucks equipped with the 3.0L Duramax (LM2/LZ0) diesel engine. Many owners are report... Read more

Incident date: Jan 9, 2026

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the brake pedal was depressed, and the brakes seized. No warning lights were illuminated. The contact parked the vehicle. The contact inspected the vehicle; however, the failure reoccurred. The contact attempted to drive the vehicle several times, but the failure reoccurred. The contact stated t... Read more

Incident date: Jan 24, 2026

On January 24, 2026, my wife was driving the vehicle we purchased in May 2025 from Ziegler GMC in Lincolnwood, Illinois. While traveling on the highway in WI the vehicle suddenly lost power without warning. She was traveling with our [XXX] son at the time and was able to safely maneuver the vehicle off the highway onto an exit ramp. Despite multiple attempts, the vehicle would not restart. She c... Read more

Incident date: Jan 24, 2026

On January 24, 2026, my wife was driving the vehicle we purchased in May 2025 from Ziegler GMC in Lincolnwood, Illinois. While traveling on the highway in WI the vehicle suddenly lost power without warning. She was traveling with our [XXX] son at the time and was able to safely maneuver the vehicle off the highway onto an exit ramp. Despite multiple attempts, the vehicle would not restart. She c... Read more

Incident date: Jan 24, 2026

On January 24, 2026, my wife was driving the vehicle we purchased in May 2025 from Ziegler GMC in Lincolnwood, Illinois. While traveling on the highway in WI the vehicle suddenly lost power without warning. She was traveling with our [XXX] son at the time and was able to safely maneuver the vehicle off the highway onto an exit ramp. Despite multiple attempts, the vehicle would not restart. She c... Read more

Incident date: Feb 14, 2026

On Febuary 14 2026 I was driving on the feeder of the freeway with speeds of 50 mph my car suddenly down shifted in the middle of driving started shaking real bad stalled wouldn’t start wouldn’t go in gear at all would just die and say engine power reduced. This is after it had just been at the dealership and they said all I needed was an update. It had to be towed and the dealership said it ... Read more

Incident date: Feb 14, 2026

On Febuary 14 2026 I was driving on the feeder of the freeway with speeds of 50 mph my car suddenly down shifted in the middle of driving started shaking real bad stalled wouldn’t start wouldn’t go in gear at all would just die and say engine power reduced. This is after it had just been at the dealership and they said all I needed was an update. It had to be towed and the dealership said it ... Read more

Incident date: Feb 18, 2026

The contact owns a 2021 GMC Yukon XL. The contact stated that while his wife was driving approximately 30 MPH, the vehicle started to lose motive power with the message "Service Transmission Now" displayed. The driver was unable to shift the vehicle into reverse(R) and turned around and returned to the residence. The contact and his wife researched online and found that there was a recall for the ... Read more

Incident date: Feb 24, 2026

The contact owns a 2025 GMC Yukon. The contact stated that while driving at an undisclosed speed, the vehicle unexpectedly went into LIMP Mode with a limited speed availability message displayed. The vehicle was restarted; however, the failure recurred. The vehicle was taken to the dealer, where it was diagnosed with engine failure. The contact was informed that the engine needed to be replaced. T... Read more

Incident date: Oct 20, 2025

August of 2025 [XXX] purchased a certified GMC Sierra 3500. The truck had been traded in May and sat in their service department waiting on a valve body. At this point, we knew this. [XXX] had done research on it, and felt confident in being told the valve body was completely replaced and now working…. Worst mistake we’ve made in a long time. It was not replaced, that was only the beginning ... Read more

Incident date: Feb 6, 2025

Brakes have been squealing since 6500 miles. The dealer resurfaced the rotors and cleaned the pads only for the brakes to be squealing again. The dealer has cleaned the brakes and applied "squeak stop" only for the brakes to continue to squeal. The service guide from GM says if brakes are making any noises they need to be "inspected immediately" however I'm being told there's nothing further to be... Read more