Driving and Operation

Increasing Speed at an ACC Set Speed

~1min read

If ACC is already activated, do one of the following:

  • Use the accelerator to reach a higher speed. Press SET–. Release SET– and the accelerator pedal. The vehicle will now cruise at the higher speed.

    When the accelerator pedal is pressed, ACC does not brake because it is overridden. The ACC indicator will light blue on the instrument cluster.

  • Press and hold RES+ until the desired set speed is displayed, then release it.
  • To increase vehicle speed in smaller increments, briefly press RES+. For each press, the vehicle moves about 1 km/h faster.
  • To increase vehicle speed in larger increments, press and hold RES+. While holding RES+, the vehicle speed increases to the next 5 km/h step, then continues to increase by 5 km/h at a time.

When set, if there is no vehicle ahead or the vehicle ahead is outside the selected following gap, the vehicle speed will increase to the set speed.

Decreasing Speed at an ACC Set Speed

If ACC is already activated, do one of the following:

  • Use the brake to reach the desired lower speed. Release the brake and press SET–. The vehicle will now cruise at the lower speed.
  • Press and hold SET– until the desired lower speed is reached, then release it.
  • To decrease vehicle speed in smaller increments, briefly press SET–. For each press, the vehicle moves about 1 km/h slower.
  • To decrease vehicle speed in larger increments, press and hold SET–. While holding SET–, the vehicle speed decreases to the next 5 km/h step, then continues to decrease by 5 km/h at a time.

Test yourself

A quick GMC Terrain quiz: every answer comes with an explanation and a link to the manual page.