2025 GMC Terrain

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.

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.

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.

Incident 1: Pulled out from stop sign car made funny noises, light came on said it couldn't shift to drive. Had towed to dealer. They said couldn't find issue except it was quart and a half low of transmission fluid. The car had approx 3,500 miles on it. Incident 2: For about two weeks when pulling out felt like it was skipping but didn't feel like transmission. Felt like over powered. Then it done same as Incident 1. Pulled out made noise would not move. Notice that is couldn't shift and check engine light came on had it towed again. Approx 6,300 miles on it. They then said it was very low on transmission fluid and they did find a small hole in hose. Danger is pulling out and it just stops in cross traffic and won't move could easily be hit. It is very scary to drive not knowing if or when it is going to happen. I have no current invoice on vehicle as it is still in shop.