Diagnostics
OnStar Vehicle Diagnostics will
perform a vehicle check every
month. It will check the engine,
transmission, antilock brakes, and
major vehicle systems. It also
checks the tire pressures, if the
vehicle is equipped with the Tire
Pressure Monitoring System. If a
diagnostics check is needed
between e-mails, push 
, and
an Advisor can run a check.
See also:
Automatic Transmission
If the vehicle is a hybrid, see the hybrid supplement for more information.
The vehicle has a Hydra-Matic® 6L80 automatic transmission, and has an electronic
shift position indicator within the ins ...
Battery Voltage and Charging Messages
BATTERY LOW START VEHICLE
When the vehicle’s battery is severely discharged, this message will display
and four chimes will sound. Start the vehicle immediately. If the vehicle is not
started and ...
Rear Climate Control System
For vehicles with the rear heat and air conditioning controls, they are
integrated with the rear seat audio controls located in the center console.
Rear Climate Control with Rear
Seat Audio C ...