GMC Terrain Complaints

3,167 consumer complaints on file.

#11738493May 18, 2026
FUEL/PROPULSION SYSTEM, UNKNOWN OR OTHER
Vehicle stalled while driving and would not restart. Strong gasoline smell present and on ground. Third occurrence. Vehicle stalled while driving at on busy road (safety issue both times). Strong raw gas smell. Would not crank afterward. Dash powered normally with check engine light. Happened previously around 27k miles in September 2025. Occurred again May 9, 2026. Occurred again today l, May 18, 2026. Vehicles is being towed to dealership again for the 3rd time
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11738404May 17, 2026
SERVICE BRAKES
The vacuum pump for the brake system failed catastrophically while driving causing damage to the brake booster and lodging metal debree into the engine components. This happened at less than 100k miles on a 2020 gmc terrain.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11738415May 17, 2026
VISIBILITY/WIPER
Windshield wiper mechanism broke while driving in heavy heavy rain near [XXX] . Extremely dangerous situation and almost resulted in a crash but I was able to make my way off of the interstate safely. Huge inconvenience because we had to wait out the rain! INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11738316May 16, 2026
UNKNOWN OR OTHER
The sun/moon roof randomly imploded while driving. It popped and felt the force of the implosion.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11737870May 14, 2026
FUEL/PROPULSION SYSTEM
I was driving down the hwy and all of a sudden the car went into reduced power mode and the dealership is saying it’s a high pressure fuel pump which is not covered under the standard warranty My vehicle only has 46000 miles Fennigan GMC Rosenberg tx
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11737591May 13, 2026
ENGINE, SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM
The contact owns a 2019 GMC Terrain. The contact stated that while stopped and attempting to turn to exit a highway ramp, he observed a loud banging noise emanating from the engine compartment. An "engine reduced power" message appeared. The vehicle then went into limp mode, and when the brake pedal was depressed, it was stiff as a rock. The vehicle coasted while he continued attempting to depress the brake pedal, and it eventually slowed down. The vehicle was steered to the side of the road and turned off. When the vehicle was turned back on and he attempted to depress the accelerator pedal, the vehicle did not accelerate. The vehicle was taken to his mother's residence approximately 100 miles away in limp mode and parked. The vehicle was not diagnosed or repaired. The contact stated that his brother, during an inspection of the vehicle, removed the vacuum pump and noticed that it was broken with numerous pieces that had gone into the engine. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 76,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11737569May 13, 2026
POWER TRAIN
The contact owns a 2022 GMC Terrain. The contact stated that while driving 45 MPH, the vehicle began to shake independently. No warning light illuminated. The vehicle was taken to the dealer where it was diagnosed that the front drive axel needed to be replaced. The contact was relating the failure to Technical Service Bulletin: 20-NA-227 (wobble or vibration during hard acceleration); however, the VIN was not included in the bulletin. The manufacturer was notified of the failure, and they informed the contact there was no recall for the failure. The failure mileage was 64,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11737294May 12, 2026
ENGINE, SERVICE BRAKES, HYDRAULIC
The contact owns a 2018 GMC Terrain Denali. The contact stated while the contact's daughter was driving, the brake pedal was depressed, however the vehicle failed to stop as intended. In addition, the contact stated that the brake pedal was unusually hard when depressed. The vehicle was taken to the dealer where the vehicle was purchased. The contact stated that the service brake vacuum pump failed while the vehicle was at the dealer. The vehicle was diagnosed with a failed service brake vacuum pump and a failed engine. The contact was informed that the service brake vacuum pump, the CAM Shaft and the engine needed to be replaced. The vehicle was repaired. The contact stated that the failure was a known failure of the vehicle. The manufacturer was not made aware of the failure. The failure mileage was approximately 260,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11737313May 12, 2026
ELECTRICAL SYSTEM, VEHICLE SPEED CONTROL, UNKNOWN OR OTHER
OnStar module not working
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11737215May 12, 2026
POWER TRAIN
The car has always had an issue where it would just get stuck in a low gear and RPMs would go high. Does this every single day. But recently it also started acting like it was put into neutral for a few seconds and then back into drive.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11737214May 12, 2026
FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING, LANE DEPARTURE: WARNING, FORWARD COLLISION AVOIDANCE: WARNINGS
Two issues here. First is that the car will give a danger warning when nothing is there. Sometimes goes as far as slamming on my breaks. Both in drive and reverse. Second is the lane keep assist. It’s like it is working backwards. I turned this all off because it would jerk me out of the lane and into the other lane or off to the sides of the road.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11737213May 12, 2026
WHEELS, STEERING, SUSPENSION
Car aggressively shakes and steering wheel shakes / jerks itself side to side when accelerating. Getting worse with time. GMC has it as a known issue but has been for months. Problem is getting worse the more it is driven. GMC says it is “safe”.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11737045May 11, 2026
STRUCTURE
The contact owns a 2020 GMC Terrain. The contact stated while the vehicle was parked, the contact noticed that the tire well was filled with water. The contact stated that the unknown box on the side was filled with water. In addition, the contact stated that the water dripped onto the ground underneath the rear tire. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 70,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11736700May 8, 2026
FUEL/PROPULSION SYSTEM, UNKNOWN OR OTHER
Car reduced speed and the smell of gas filled the car. Car shut off. Check engine light came on with reduced speed. This is the second time this has happened. Gas leaked onto ground from car. Car stalls immediately while driving and does not allow you to press the gas to keep moving. Almost hit from behind on Main Street.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11736699May 8, 2026
FUEL/PROPULSION SYSTEM
Car reduced speed and smells of gas. Will not crank and will stall immediately and just stops immediately. Car has only 30,000 miles and it has stalled out for the second time with the same issue. The first time the car stalled on the freeway and I was almost hit from the back. This second time reduced speed and quickly shut off on a Main Street and was almost hit again. Car does not allow you to press the gas and coast during the incident.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11735931May 5, 2026
POWER TRAIN
Car locks itself into 2 Wheel Drive when conditions are "unfavorable" meaning sometimes rain and most commonly in cold weather. If anyone has driven on snowy and icy roads during the winter, they know how much of a problem this can cause in the winter. Not only has the dealership's maintenance department not been able to diagnose the issue but GM themselves are refusing to acknowledge this problem as well. This is a huge safety hazard given the instability of the vehicle driving in those conditions, especially if you cant gain traction while on a busy road. The only indicator is the light that shows AWD and 2WD is in 2WD and an orange color. This is a big accident waiting to happen, if it hasn't happened to someone else already, given the state I've seen some of the newer models in.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11735393May 3, 2026
VISIBILITY/WIPER
I got into my car to head to the store today. Upon closing drivers door I heard a muffled sounding pop. As I looked around I noticed back windshield looked “weird”. Got out and walked around the back to see it completely shattered. It just exploded and every inch has a crack or chip, even all asking the edges of the glass. I lifted the tail gate to see if a rock was thrown by chance and a chunk fell into the car. No rock was found. It simply shattered. The temp today was low 60’s on May 3rd, 2026 here in Ohio.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11734710April 29, 2026
VISIBILITY/WIPER
During heavy rainfall in the mountains at dawn, my windshield wipers suddenly have stopped working. We can manually move the wipers with ease and can hear the motor engaging but both front wipers suddenly stopped. We were 1200 miles from home on what was supposed to be a vacation. Carvana reports 2 recalls for my reports but the dealerships have no recalls for my year of vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11734629April 29, 2026
POWER TRAIN
Automatic transmission solenoid control valve body got stuck open and ruined the whole transmission. This has been a reoccurring problem with these vehicles. Image is from a code read. Issue was confirmed by Gastorf Chevrolet, and an independent transmission shop.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11734525April 29, 2026
POWER TRAIN
The contact owns a 2026 GMC Terrain. The contact stated that while attempting to depress the accelerator pedal after coming from a complete stop, the vehicle started wobbling. A dealer was contacted. The vehicle was taken to the dealer to be diagnosed; however, the diagnostic result was unknown. The vehicle was not repaired. The contact associated the failure with Technical Service Bulletin: PIT6466 (Shimmy, Shake or Wobble When Leaving a Stop); however, the VIN was not included in the bulletin. The manufacturer was notified of the failure and informed the contact that there was no recall for the failure, and opened a case. The failure mileage was 5,200.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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