GMC Terrain: Setting Adaptive Cruise Control / Disengaging ACC

Do Not Use ACC on Hills and When Towing a Trailer

Do not use ACC when driving on steep hills or when towing a trailer. ACC will not detect a vehicle in the lane while driving on steep hills. If the brakes are applied, ACC disengages...

Erasing Speed Memory

The ACC set speed is erased from memory if is pressed or if the ignition is turned off...

Other information:

GMC Terrain 2018-2026 Owners Manual: Setting Adaptive Cruise Control

If is on when not in use, SET–/ RES+ could be pressed by mistake and engage ACC when not desired. Keep off when cruise is not being used. Select the set speed desired for ACC. This is the vehicle speed when no vehicle is detected in your path. While the vehicle is moving, ACC will not set at a speed less than 25 km/h (15 mph), although it can be resumed when driving at lower speeds...

GMC Terrain 2018-2026 Owners Manual: Seat Belts

This section describes how to use seat belts properly, and some things not to do. Warning Do not let anyone ride where a seat belt cannot be worn properly. In a crash, if you or your passenger(s) are not wearing seat belts, injuries can be much worse than if you are wearing seat belts. You can be seriously injured or killed by hitting things inside the vehicle harder or by being ejected..