Unable to Connect to OnStar Message
If there is limited cellular coverage
or the cellular network has reached
maximum capacity, this message
may come on. Push 
to try the
call again or try again after driving a
few miles into another cellular area.
See also:
Rear Display
Press the Rear Display(s) screen button to allow the choice of sources for rear
display between front disc, rear aux, or usb, if connected. ...
Transportation Options
Warranty service can generally be completed while you wait. However, if you are
unable to wait, GM helps to minimize inconvenience by providing several transportation
options. Depending on the cir ...
Wheel Replacement
Replace any wheel that is bent, cracked, or badly rusted or corroded. If wheel
nuts keep coming loose, the wheel, wheel bolts, and wheel nuts should be replaced.
If the wheel leaks air, replace it ...