Table 1 shows two common forward collision avoidance related problems of the 2025 GMC Terrain.
| Problem Category | Number of Problems |
|---|---|
| Warnings problems | |
| Automatic Emergency Braking problems |
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.
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.