See also:

Cellular and GPS Antennas
Avoid placing items over or near the antenna to prevent blocking cellular and GPS signal reception. Cellular reception is required for OnStar to send remote signals to the vehicle. ...

When the System Does Not Seem to Work Properly
If the URPA system will not activate due to a temporary condition, the message PARK ASSIST OFF will be displayed on the DIC and a red light will be shown on the rear URPA display when the shift ...

Magnetic Ride Control™
The vehicle may have Magnetic Ride Control that automatically adjusts the ride of the vehicle. The controller receives input from the system to determine the proper ride. If the controller detec ...