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:
Heated Mirrors
The vehicle has heated mirrors:
(Rear Window Defogger): Press to heat the mirrors.
See “Rear Window Defogger” under Dual Automatic Climate Control System for more information. ...
Shocks and Struts
Shocks and struts help aid in control
for a smoother ride.
• Signs of wear may include
steering wheel vibration, bounce/sway while braking, longer
stopping distance, or uneven
tire wear.
...
Radio Messages
CAL ERR (Calibration Error): The audio system
has been calibrated for your vehicle from the
factory. If CAL ERR displays, it means that the
radio has not been configured properly for
the vehicle a ...