GMC Terrain: Setting Adaptive Cruise Control / Other Vehicle Lane Changes

Curves in the Road

Warning On curves, ACC may not detect a vehicle ahead in your lane. You could be startled if the vehicle accelerates up to the set speed, especially when following a vehicle exiting or entering exit ramps...

Objects Not Directly in Front of Your Vehicle

The detection of objects in front of the vehicle may not be possible if: The vehicle or object ahead is not within your lane. The vehicle ahead is shifted, not centered, or is shifted to one side of the lane...

Other information:

GMC Terrain 2018-2025 Owners Manual: Cleaning the Sensing System

The camera sensor on the windshield behind the rearview mirror can become blocked by snow, ice, dirt, mud, or debris. This area needs to be cleaned for ACC to operate properly. The vehicle headlamps may need to be cleaned due to dirt, snow, or ice...

GMC Terrain 2018-2025 Owners Manual: Automatic Dimming Mirror and Reverse Tilt Mirrors

Automatic Dimming Mirror The vehicle has an automatic dimming outside mirror on the driver side. The mirror will adjust for the glare of headlamps behind you. Reverse Tilt Mirrors If equipped with memory seats, the passenger and/or driver mirror tilts to a preselected position when the vehicle is in R (Reverse), if enabled...