GMC Terrain: Setting Adaptive Cruise Control / Selecting the Follow Distance Gap
When a slower moving vehicle is detected ahead within the selected following gap, ACC will adjust the vehicle's speed and attempt to maintain the follow distance gap selected.
Press 
on the steering wheel to
adjust the following gap. Each press
cycles the gap button through three
settings: Far, Medium, or Near.
When pressed, the current gap setting displays briefly on the instrument cluster. The gap setting will be maintained until it is changed.
Since each gap setting corresponds to a following time (Far, Medium, or Near), the following distance will vary based on vehicle speed. The faster the vehicle speed, the further back your vehicle will follow a vehicle detected ahead. Consider traffic and weather conditions when selecting the following gap. The range of selectable gaps may not be appropriate for all drivers and driving conditions.
Changing the gap setting automatically changes the alert timing sensitivity (Far, Medium, or Near) for the Forward Collision Alert (FCA) feature. See Forward Collision Alert (FCA) System.
Increasing Speed While ACC Is at a Set Speed
If ACC is already activated, do one
of the following:
Use the accelerator to get to the
higher speed. Press SET–.
Release SET– and the
accelerator pedal...
Alerting the Driver
If ACC is engaged, driver action
may be required when ACC cannot
apply sufficient braking because of
approaching a vehicle too rapidly.
When this condition occurs, six red
lights will flash on the windshield...
Other information:
GMC Terrain 2018-2025 Owners Manual: Camera Views
Touch the camera view buttons along the bottom of the infotainment display. Front/Rear Standard View : Displays an image of the area in front or behind the vehicle. Touch Front/Rear Standard View on the infotainment display when a camera view is active...
GMC Terrain 2018-2025 Owners Manual: Taillamps
To replace one of these lamps: Open the liftgate. See Liftgate. Remove the two screw caps and two screws from the taillamp assembly. Pull the taillamp assembly out of the vehicle body. Disconnect the lamp wiring harness. Turn the bulb socket counterclockwise and pull it out...