2025 GMC Terrain problems

Filed Aug 29, 2026 · Brakes, Driver assistance · NY

Two problems with this vehicle: 1) Transmission occasionally slips on the 2-3 shift which the dealer says he cannot duplicate. Vehicle was brought in four times for this problem. According to the dealer GM corporate has stated the transmission is working within normal parameters, since no codes were found. 2) Vehicle auto braking randomly slams on the brakes with nothing in its path. Dealer states turn off system to just Alert only not Alert and Brake. No codes were set. Fortunately no one was behind me as this could have caused me to be rear ended by another vehicle. In both cases it appears that if no codes are set the problem does not exist. Nov. 21, 2025, Feb. 12, 2026, July 09, 2026, Aug. 28, 2026.

Filed Jun 25, 2026 · Airbags, Steering · IN · crash · 1 injury

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)

Filed May 12, 2026 · Acceleration, Electrical · MA

OnStar module not working

Filed May 5, 2026 · Transmission · AK

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.

Filed Apr 1, 2026 · Brakes, Steering · FL

My SUV pulls hard to the right when braking at speeds above 50 mph and much more on the interstates at 65 mph and above. I first experienced this after three weeks of ownership on a drive up I-95 on a trip to NC. It has happened numerous times while traveling on the interstates and has almost caused loss of control when having to brake hard when cut off by another driver or traffic suddenly coming to a stop. The vehicle has been to the service department numerous times....at first they suspected a braking issue and have had both calipers replaced, all brake lines replaced, lower control arms replaced and the right side strut replaced. None of these repairs have solved the problem. The factory service rep who took over the situation tested 3 other GMC 2025 Terrain suvs and all had the same problem. He reported the issue on a safety report to GM in Michigan and the response from GM was that it is a normal condition for the Terrain models. I have never owned, driven, or ridden in another vehicle in over 50 years of driving which performed like this, this is not a normal condition in my opinion.

Filed Feb 13, 2026 · Transmission · FL · crash

Vehicle did not go into park when the ignition was turned off. Car started to roll while passenger was getting out of the vehicle as another vehicle was parking beside us. The other vehicle could not avoid our rolling vehicle. Passenger had to quickly sit down to avoid being hit. The next day the vehicle was taken to the dealership, and they could not find anything wrong. They gave us a copy of bulletin#08-07-30-026I. We were not aware of any problems or bulletins being issued prior to the accident. We had repairs of $2,705.71 and don't know what the other driver incurred.

Filed Feb 9, 2026 · Brakes, Engine · 1,126 miles · AL

The contact owns a 2025 GMC Terrain. The contact stated that while his wife was driving approximately 40 MPH on wet roads, the brake pedal was depressed, but the brake pedal was stiff, preventing the vehicle from slowing down as intended. There were several unknown warning lights illuminated during the failure. The accelerator pedal was released, and the vehicle rolled to a stop. The vehicle was turned off and restarted, but the check engine warning light remained illuminated. The vehicle was pulled over to the side of the road and turned off. The vehicle was then towed to a dealer, where it was diagnosed, and determined that the brake control module needed to be replaced. The vehicle was repaired, but the failure reoccurred approximately 7 months and 2 weeks later. The manufacturer was notified of the failure. The failure mileage was approximately 1,126.

Filed Jan 19, 2026 · Electrical, Engine · WV

Vehicle wouldn’t unlock/start with primary key fob or secondary key fob. Tried manual entry with both key fobs still could not enter.

Filed Jan 6, 2026 · Body, Driver assistance · IN

Top of roof pops when you shut car door, Leaking either transmission fluid or oil, Left turn signal doesn't stay engaged when turning, Side mirror warning lights randomly go off when no car is around. Car is not shifting correctly when driving

Filed Aug 28, 2025 · Visibility · NJ

I just purchased a brand new 2025 Terrain. The entire windshield is defective. The glass is distorted and causing visual impairment. It is VERY unsafe. I have contacted the dealership multiple times and have not yet received a response.