OnStar Vehicle Diagnostics can perform a vehicle check every month. It will check
the engine, transmission, antilock brakes, and other major vehicle systems. It also
checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring
System. If an On-Demand Diagnostics check is needed, press
, and an Advisor can run a check.
Connections
OnStar Additional InformationIf No Steam Is Coming from the Engine Compartment
If an engine overheat warning is displayed but no steam can be seen or heard,
the problem may not be too serious. Sometimes the engine can get a little too hot
when the vehicle:
Climbs a long hill on a hot day.
Stops after high-speed driving.
Idles for long periods in traffic.
If the ...
Automatic Door Locks
If equipped, the vehicle is programmed so that when the doors are closed, the
ignition is on, and the shift lever is moved out of P (Park) for automatic transmissions,
or the vehicle speed is above 13 km/h (8 mph) for manual transmissions, the doors
and the liftgate will lock.
To unlock the d ...
Winter Tires
This vehicle was not originally equipped with winter tires. Winter tires are
designed for increased traction on snow and ice-covered roads. Consider installing
winter tires on the vehicle if frequent driving on ice or snow covered roads is
expected. See your dealer for details regarding winter ...