Activating Adaptive Cruise Control on Your GMC

Adaptive cruise control in GMC vehicles is turned on using the stalk on the right side of your steering column, below the turn signal lever. Pull the stalk toward you once to enter regular cruise control mode, then pull it again to set up adaptive cruise control. The system will display "ACC" on your instrument cluster when it is active. You must be traveling at least 20 mph for the system to engage.

Once adaptive cruise control is on, use the plus and minus buttons on the stalk to set your desired speed. The vehicle will then maintain that speed and automatically adjust if traffic ahead slows down, speeding back up when the road clears. The distance between your GMC and the vehicle in front can be adjusted using the distance control button, typically located on the steering wheel or the cruise stalk itself, depending on your model year.

Key Takeaways

  • Pull the cruise control stalk toward you twice: once for regular cruise control, once more for adaptive cruise control mode.
  • Adaptive cruise control requires a minimum speed of 20 mph and will show "ACC" on your instrument cluster when active.
  • Use the plus and minus buttons on the stalk to set your desired cruising speed after set up.
  • Adjust the following distance to the vehicle ahead using the distance control button on your steering wheel or stalk.
  • The system will automatically slow down and speed up to match traffic flow while maintaining your set distance.

Where to Find the Adaptive Cruise Control Stalk

The cruise control stalk is mounted on the right side of your steering column, directly below the turn signal lever. It is a small lever that you pull toward you or push away from you to control the cruise functions. On most GMC models from 2015 onward, this stalk also houses the adaptive cruise control buttons and distance adjustment controls.

If you are unsure whether your specific GMC model has adaptive cruise control, check your owner's manual or look at your instrument cluster display. Vehicles without the system will not show "ACC" as an option when you interact with the cruise stalk. Some older GMC models or base trim levels may have standard cruise control only, without the adaptive feature.

Setting Your Speed and Following Distance

After pulling the stalk twice to set up adaptive cruise control, the system enters standby mode. Press the plus button on the stalk to increase your desired speed in 1 mph increments, or hold it down to jump in larger steps. Press the minus button to decrease speed the same way. Your set speed will display on the instrument cluster.

The following distance adjustment is usually controlled by a separate button labeled with a car and distance lines, or it may be integrated into the stalk itself. Press this button repeatedly to cycle through distance settings, typically ranging from one to four car lengths. A shorter distance means the system will allow less space between your vehicle and the one ahead; a longer distance provides more buffer. Choose the setting that matches your comfort level and driving conditions.

How Adaptive Cruise Control Responds to Traffic

Once your speed and distance are set, adaptive cruise control uses a forward-facing radar or camera to monitor the vehicle ahead. If traffic slows down and the vehicle in front gets closer than your set distance, your GMC will automatically reduce speed to maintain that gap. The deceleration is gradual and smooth under normal conditions.

When the road ahead clears and no vehicle is within your set distance, adaptive cruise control will accelerate back to your preset speed. This happens automatically without you touching the accelerator. If traffic comes to a complete stop, the system will bring your vehicle to a stop as well, though you may need to press the accelerator or resume button to move again once traffic starts, depending on your GMC model year and settings.

Deactivating Adaptive Cruise Control

To turn off adaptive cruise control, press the cancel button on the cruise stalk, usually located on the left side of the stalk or as a dedicated button nearby. You can also tap the brake pedal, which will when ready disengage the system. Tapping the accelerator will not turn off adaptive cruise control; it will only increase your set speed.

If you want to keep adaptive cruise control active but temporarily take manual control, straightforward press the accelerator or brake as needed. The system will remain armed and ready to resume once you release the pedals and the conditions allow it. To fully exit cruise control mode and return to manual driving, use the cancel button.

Troubleshooting Common set up Issues

If adaptive cruise control will not turn on, first check that you are traveling at least 20 mph. The system will not set up below this speed. Also verify that your windshield is clean, as the forward-facing camera or radar sensor needs a clear view to function properly. Dirt, snow, or condensation on the windshield can prevent the system from working.

If the "ACC" indicator does not appear on your instrument cluster after pulling the stalk twice, your vehicle may not have adaptive cruise control, or the system may have a fault. Check your owner's manual to confirm your model includes this feature. If your GMC should have adaptive cruise control but it is not responding, consult your dealer, as the radar or camera sensor may need recalibration or service.

Frequently Asked Questions

Can I use adaptive cruise control in heavy traffic or stop-and-go driving?

Adaptive cruise control works in heavy traffic and can bring your vehicle to a stop if needed. However, it is designed for highway and moderate traffic conditions rather than bumper-to-bumper city driving. In very slow or stop-and-go situations, you may find it easier to drive manually. Always stay alert and ready to take control at any time.

What happens if the radar sensor gets dirty or blocked?

A dirty or blocked sensor will prevent adaptive cruise control from working properly. Clean your windshield regularly, especially the area where the forward-facing camera or radar is located, usually behind the rearview mirror. If cleaning does not restore function, the sensor may need professional recalibration at a GMC dealership.

Does adaptive cruise control work in rain or snow?

Adaptive cruise control can operate in rain and light snow, but heavy precipitation or snow may reduce its effectiveness. The radar or camera needs to detect the vehicle ahead, which becomes harder in severe weather. In these conditions, it is safer to switch to manual driving and adjust your speed yourself.

Can I adjust the set speed while adaptive cruise control is active?

Yes. Use the plus and minus buttons on the cruise stalk to increase or decrease your set speed at any time while adaptive cruise control is running. Changes take effect when ready, and the system will accelerate or decelerate to match your new setting.

What is the difference between pulling the stalk once and twice?

Pulling the stalk once activates standard cruise control, which maintains a fixed speed without adjusting for traffic ahead. Pulling it a second time switches to adaptive cruise control, which automatically adjusts your speed based on the vehicle in front of you. Both modes use the same stalk to set and adjust speed.