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. ...

Anti-theft Alarm System Message
SERVICE THEFT DETERRENT SYSTEM This message displays when there is a problem with the theft-deterrent system. The vehicle may or may not restart so you may want to take the vehicle to your dealer ...

Trip Odometer
The trip odometer can show how far the vehicle has been driven since the trip odometer was last set to zero. For more information see “Trip Odometer” under Driver Information Center (DIC)  . ...