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. ...

Headlamp Aiming
The vehicle has a visual optical headlamp aiming system. The aim of the headlamps have been preset at the factory and should need no further adjustment. However, if the vehicle is damaged in a cras ...

SERVICE STABILITRAK
This message displays if there has been a problem detected with the StabiliTrak® system. The TCS/StabiliTrak warning light on the instrument panel cluster also comes on. If this message come ...