GMC Terrain: Setting Adaptive Cruise Control / Lighting Conditions Affecting ACC

The ACC front camera can be affected by poor lighting conditions, and ACC may have limited performance when:

  • There are changes in brightness, such as entering and exiting tunnels, bridges, and overpasses.
  • Low sun angles cause the camera to not detect objects, or it is more difficult to detect objects in the same traffic lane.
  • Lighting is poor in the evening or early morning
  • There are multiple changes in brightness or shadows along the vehicle roadway.
  • In a tunnel without the headlamps on, or in a tunnel when there is a vehicle in front that does not have its taillamps on.
  • Subjected to strong light from opposing lane traffic in the front of the vehicle, such as high-beam headlamps from oncoming traffic.

    Weather Conditions Affecting ACC

    If the interior temperature is extremely high, the instrument cluster may indicate that ACC is temporarily unavailable. This can be caused by extreme hot weather conditions with direct sunlight on the front camera...

    Accessory Installations and Vehicle Modifications

    Do not install or place any object around the front camera windshield area that would obstruct the front camera view. Do not install objects on top of the vehicle that overhang and obstruct the front camera, such as a canoe, kayak, or other items that can be transported on a roof rack system...

    Other information:

    GMC Terrain 2018-2022 Owners Manual: Forward Collision Alert (FCA) System and Forward Automatic Braking (FAB)


    Forward Collision Alert (FCA) System If equipped, FCA may help avoid or reduce the harm caused by front-end crashes. FCA provides a green indicator, , when a vehicle is detected ahead. This indicator displays amber if you follow a vehicle too closely...

    GMC Terrain 2018-2022 Owners Manual: Automatic Transmission Fluid


    It is not necessary to check the transmission fluid level. A transmission fluid leak is the only reason for fluid loss. If a leak occurs, take the vehicle to your dealer and have it repaired as soon as possible. Change the fluid at the intervals listed in Maintenance Schedule , and be sure to use the transmission fluid listed in Recommended Fluids and Lubricants...

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