GMC Terrain Complaints

3,167 consumer complaints on file.

#11748887July 7, 2026
UNKNOWN OR OTHER
The Screen calls my own phone number and hangs up over and over if I just ended a call. I am not able to use any part of the screen afterwards such as my map. It stays like that until I disconnect the Bluetooth and wifi from my phone while trying to drive. Safety issue!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11748359July 5, 2026
ENGINE, UNKNOWN OR OTHER
While driving the vehicle became extremely difficult to stop I was advised that the Vacuum booster pump was broken and it needed to be replaced. This was first completed 09/24/25 by Gateway tire and service center. I was advised that there was a service bulletin for the issue. Then I have had the same thing happen and I returned the vehicle to the same repair shop and I was advised that the Vacuum booster pump was broken and it caused the exhaust camshaft to break, as well as the timing was out. The shop had to replace several things in order to repair and I was responsible for the cost. There was no warning before either of the incidents.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11748269July 4, 2026
STEERING, WHEELS, POWER TRAIN
This vehicle was bought new and is a NEW 2026 GMC TERRAIN DENALI with less than 5,000 miles at this time. It is a continuous event and not a specific failure date, but began soon after purchasing. The specific parts are UNKNOWN. It could be tires, wheels, steering parts (CV JOINTS, CONTROL ARMS ETC) or possibly transmission. I took it initially to the purchasing dealership and they took it for a ride and just dismissed the problem without investigating. Several days later I called and talked to the person who sold me the SUV and was told either him or service manager or both would call me, but neither did so. They were to set up a return date. After this insulting experience I decided to take it to a Cadillac dealer that I have had great experience with in the past. They took it for a ride and did experience the problem and investigated what they thought could be causing the SUV to wobble, shimmy, or shaking sensation. This Cadillac dealer said there investigation showed nothing wrong and returned the vehicle to me and said nothing could be done unless GM gave them permission. Next I wrote to the service manager expressing my disappointment in nothing being done and my disappointment in General Motors. There is a Service Bulletin (Document ID: PIT6466). This makes four efforts on my part to get satisfaction with this 2026 GMC TERRAIN DENALI and how it is not fun to drive and there is anxiety on the safety of the vehicle when being driven. *Now for the problem I am experiencing with this 2026 GMC TERRAIN DENALI. There is the sensation of a “wobble, shimmy, or shaking” under low to moderate acceleration when going straight or turning. It could be tires, wheels, steering parts or power train. It is difficult to tell. Sometimes the sensation is as if the wheels will fall off. This is an awful feeling and gives you the feeling the SUV is not safe and it is not fun to drive at all.* Why do I have to drive a brand new expensive SUV and feel unsafe and not enjoy do so?
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11748117July 3, 2026
POWER TRAIN
No engine lights are on. When at stops it starts chugging and when I accelerate sometimes it does not go like it should. It idles high and feels like it is slipping. I have almost been hit in the rear several times when this happens. One lady did rear end me but the damage was so little that I did not call the cops. This vehicle has not been inspected and it is available for inspection at any time.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11747608July 1, 2026
SERVICE BRAKES
Formal Safety Complaint – 2021 GMC Terrain Brake Failure Vehicle: 2021 GMC Terrain Incident Location: Garden State Parkway (NJ) Speed: Approximately 65 mph Incident Description While driving northbound at highway speed, I attempted to change lanes and apply my brakes. When I pressed the brake pedal, it became completely rigid (rock hard) and failed to function. I had no ability to slow the vehicle using normal braking. At that moment, I was forced to: Navigate multiple emergency lane changes to avoid striking other vehicles Prepare for potential collision due to lack of braking control Apply extreme force with both feet on the brake pedal in an attempt to generate any slowing Eventually, I was able to steer the vehicle to the shoulder while exerting maximum pressure on the brake pedal. During the incident, a “Driving Assist Brake” message appeared on the dashboard, and the braking system has remained in this same compromised condition since. Safety Concerns The brake pedal became non-functional without warning The failure occurred at highway speed, creating an immediate life-threatening situation This was not a gradual degradation—this was a sudden, complete loss of braking capability The issue persisted after the vehicle was stopped Broader Concern I have since found multiple reports and videos of other GMC Terrain owners experiencing the exact same failure, suggesting a potential systemic or design-related issue. Given: The severity of braking system failure The apparent repeat nature of this issue The lack of an active recall addressing it I believe this represents a significant safety risk to GMC Terrain drivers and the public. Impact This incident caused: Immediate danger to my life and other drivers Extreme emotional distress Loss of confidence in the safety of the vehicle Requested Action I am requesting: A formal investigation into this braking failure Immediate inspection and repair of my vehicle at no cost Clarification from GMC regarding know
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11747599July 1, 2026
SERVICE BRAKES
Driving on the Garden state parkway on Sunday night June 28, 2026 I proceed to cross over the ratitan bridge. There was traffic as I was going down the bridge at 70 miles an hour. When I applied the brakes the car would not stop. I had two 6 years old in the backseat. I applied 2 feet to the brake pedal and it was like a rock and the car would not slow down. I thought I was going to crash. I had to steer and lane change several times to avoid hitting other cars. This has something to do with the driving assist braking system. I was scared to death. If this isn’t a safety concern nothing is. This should be a recall for GMC to fix because it’s an accident waiting to happen.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11746462June 25, 2026
AIR BAGS, STEERING, WHEELS
I was driving north on [XXX] when I felt a slight pull to the right. I figured it was my lane assist even though I was in my lane. Seconds later it felt like if someone was in my passenger seat and just yanked my steering wheel to the right hitting the guardrail. My whole tire and the assembly was off but everything was still intact to the tire. The tie rods, axle, ball joints, the whole assembly. During investigation I was told by the mechanic that the stabilizer bar was a clean break. There was damage to the front end and all down the side. I was told by GM that the force of the impact was what ripped off my tire but it was not enough impact or damage to deploy the airbags. I was on crutches for my left leg, bruising and scar now from a huge abrasion to my right arm. Still having right shoulder pain. I sent all this to the attorney General and they tried to mediate but Afton from GM told Mike that he contacted me 3 times and I did not return her calls. I called her a left her multiple messages and she has not returned my calls. I only had the car for a few months with 5,000 miles on it. I put $2,500 down then had to turn around and get a used vehicle, put another $2,000 down and making the same payment due to the hit on my credit for a 2023 plain vehicle. Plus my insurance went up, missed work, medical bills, etc. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
Yes
Fire:
No
Injuries:
1
Deaths:
0
#11746008June 23, 2026
ENGINE, FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP, FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP:CONTROL/DRIVE MODULE
The contact owns a 2022 GMC Terrain. The contact stated that while his wife was driving 35 MPH, the contact received an email and text from OnStar with DTC: P129F, and the message to not drive the vehicle was displayed. The check engine warning light was illuminated. The vehicle was taken to the local dealer, where it was diagnosed and determined that the fuel pump power control module had failed. The vehicle was repaired, but the failure reoccurred. The contact stated that the failure was related to N252516900, a General Motors (GM) emission recall related to the Fuel Pump Power Control Module (FPCM and GM safety recall N222372310 – Inadequate Fuel Pump Flow. The local dealer was contacted, who stated that the fuel pump had failed to meet higher outputs. The manufacturer was contacted and confirmed that there was no coverage on the vehicle. The failure mileage was approximately 66,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11745975June 23, 2026
STRUCTURE:INTERIOR PANELS:CENTER CONSOLE
The contact owned a 2026 GMC Terrain. The contact stated that while her husband was driving on a perpendicular road at an undisclosed speed, entering a highway, the driver yielded; however, a truck in the median was attempting to cross the highway during oncoming traffic, and an oncoming vehicle crashed into that vehicle, causing the truck to crash into the front of the vehicle. The front air bags deployed as intended. The contact stated that an electrical fire started under the center console, and the driver’s shirt was burned by the fire. The Fire Department was on scene and removed the contact from the vehicle; however, a fire report was not filed. An off-duty sheriff witnessed the crash and assisted in removing the contact husband from the vehicle. The driver was taken to the Emergency Room for neck, arm, and wrist injuries, bruises, burns, and scratches. The contact was unsure of how the fire was extinguished. The contact mentioned that the smoke emitting was carbon monoxide-related. The vehicle was towed to an impound lot and was deemed a total loss by the insurance provider. A police report was filed. The dealer and the manufacturer were notified of the failure, and there was a pending inspection on the vehicle. The failure mileage was approximately 6,300.
Crash:
Yes
Fire:
Yes
Injuries:
1
Deaths:
0
#11745857June 23, 2026
POWER TRAIN
The vehicle has experienced a recurring transmission-related defect that has required multiple repair attempts by an authorized GMC dealership. The transmission system has also exhibited fluid leakage. Despite prior repairs, the problem has continued to reoccur. Transmission and associated transmission fluid sealing components. The vehicle is currently available for inspection upon request. A transmission is a critical safety component that transfers engine power to the wheels. A transmission defect or fluid leak can result in loss of propulsion, hesitation, inability to accelerate as expected, unexpected changes in vehicle operation, or transmission failure while driving. These conditions could increase the risk of a crash, particularly when merging into traffic, crossing intersections, or traveling at highway speeds. Transmission fluid leaking onto roadways or vehicle components may also create additional safety concerns. The vehicle has been presented to an authorized GMC dealership for diagnosis and repair on multiple occasions. The dealership has acknowledged and attempted repairs related to the transmission. The vehicle has been inspected and repaired by authorized GMC service personnel. No police involvement. No independent inspection has been performed at this time. Manufacturer-authorized dealerships have documented the repairs. Symptoms included transmission-related concerns and transmission fluid leakage. The defect first appeared while the vehicle was under warranty and has continued despite repair attempts. The recurring nature of the transmission defect and fluid leak has reduced confidence in the vehicle’s ability to operate safely and reliably. The vehicle remains under warranty and has undergone multiple repair attempts without a permanent resolution.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11745463June 21, 2026
UNKNOWN OR OTHER, BACK OVER PREVENTION: REARVIEW SYSTEM BRAKING, BACK OVER PREVENTION: WARNINGS
Backup camera stopped working and displays a blue screen stating “service backup camera.” This was an issue when the vehicle was under 3 year manufacturer bumper to bumper warranty and was fixed by dealer at no cost. Now this same issue has occurred again approximately 3-4 years later. I thought at first this was an issue specific to my vehicle but now after doing research I see this is an issue across several GMC Terrian vehicles and other GM vehicles. This issue should be fixed by the manufacturer for all vehicles affected. Vehicle owners should not be responsible to fix faulty parts from the manufacturer.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11745461June 21, 2026
FUEL/PROPULSION SYSTEM
Won't start and stay running
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11745358June 20, 2026
SERVICE BRAKES
ABV came on. SCR alerted I needed service. On a 25 mph road I no longer could brake randomly
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11745090June 18, 2026
SEAT BELTS
The contact owns a 2013 GMC Terrain. The contact stated that the metal base of the seatbelt of the driver side has become exposed. The contact stated area looks frayed and deteriorated. The contact stated that is coming apart and has affected the seatbelt function. The local dealer was not contacted about the failure. The manufacturer was not made aware of failure. The failure mileage was approximately 177,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11745002June 18, 2026
FUEL/PROPULSION SYSTEM
Driving to work and the vehicle suddenly turned off in the middle of the road just as I had turned the corner onto another street leaving me in a dangerous spot. There was no warning lights or anything it just shut off and would not start back up. Sister had to wait with vehicle while brother in law drove me to work. Had to have the vehicle towed to Tinney Chevrolet GMC service department and after they completed their service found out the FUEL PUMP MODULE failed. I was told GMC has open recall for 2022 GMC Terrain on this exact issue but for some reason my VIN number doesn't come from the HUB they issued the recall from? I find it suspicious my vehicle had the exact same part fail and left me in a dangerous situation with traffic coming around the corner as well as the inconvenience of family having to come take me to work and sit with my vehicle waiting for the tow truck. I had a bill from the service dept. for this repair of $671.15 and the towing company was $125.00 I would hope GMC would look into the fuel pump module issue for all 2022 GMC Terrain vehicles.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744960June 18, 2026
ENGINE, POWER TRAIN
Accelerator lag from any speed or stop. The care will take several seconds to hunt for the correct gear before shifting to accelerate. Or it will delay acceleration for several seconds while your pressing the accelerator. No SES indicator active. Mechanics can’t find issues. Other owners on forum a report the same sluggish behavior. These 1.5 turbo cars seem to need a software fix that they are not receiving. It’s like the drive by wire doesn’t register. Affects any gm vehicle with the 1.5 turbo and 9 spd auto.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744805June 17, 2026
FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
The contact owns a 2020 GMC Terrain. The contact stated that shortly after refueling the vehicle, the vehicle suddenly stalled while accelerating from a stop light. The contact stated that after the vehicle stalled, the transmission failed to shift out of park, and the vehicle failed to restart. The vehicle was later towed to the local dealer to be diagnosed. The vehicle was diagnosed with fuel pump failure. The fuel pump was replaced, and the vehicle was repaired. The manufacturer was not yet contacted. The failure mileage was 46,917.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744779June 17, 2026
ENGINE, FUEL/PROPULSION SYSTEM
Since purchase, this vehicle has consistently had an issue with the fuel system. When I call GMC they state only use no ethanol fuel. I wouldn’t have bought this car if that was the case. The dealership never said that when I was buying it. We replaced the entire engine for $11,000 because of a torn radiator hose, overheating and cracked a gasket. Now, the car is refusing to drive, giving engine power reduced
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11743616June 11, 2026
AIR BAGS
I hit a deer and it totaled my vehicle and the Airbags did not deploy
Crash:
Yes
Fire:
No
Injuries:
0
Deaths:
0
#11743259June 10, 2026
ENGINE AND ENGINE COOLING
See attached document for complaint.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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