One problem related to warnings has been reported for the 2026 GMC Terrain. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2026 GMC Terrain based on all problems reported for the 2026 Terrain.
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.
| Automatic Emergency Braking problems | |
| Warnings problems |