Ignition Transmission Lock Check
While parked, and with the parking brake set, try to turn the ignition to LOCK/OFF in each shift lever position.
• The ignition should turn to LOCK/OFF only when the shift lever is in P (Park).
• The ignition key should come out only in LOCK/OFF.
Contact your dealer if service is required.
See also:
TTY Users
OnStar has the ability to communicate to the deaf, hard&-ofhearing, or speech&-impaired
customers while in the vehicle. The available dealer&-installed TTY system can provide
in-vehicl ...
Maintenance Replacement Parts
Replacement parts identified below by name, part number, or specification can
be obtained from your dealer.
If your vehicle has a diesel engine, see the Duramax diesel supplement for more
informa ...
Brakes
Brakes stop the vehicle and are crucial to safe driving.
• Signs of brake wear may include chirping, grinding, or squealing noises, or difficulty stopping.
• Trained dealer technicians have acce ...





