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 
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Advisor can run a check.
See also:
Replacing Safety Belt System Parts after a Crash
WARNING
A crash can damage the safety belt system in the vehicle.
A damaged safety belt system may not properly protect the person using it,
resulting in serious injury or even death in a crash. T ...
Automatic EPB Release
The EPB will automatically release if the vehicle is running, placed into
gear, and an attempt is made to drive away. Avoid rapid acceleration when the
EPB is applied, to preserve parking brake lini ...
Owner Checks and Services
At Each Fuel Stop
- Check the engine oil level.
See Engine Oil.
Once a Month
- Check the tire inflation
pressures. See Tire Pressure.
- Inspect the tires for wear.
See Tire Inspection.
- Chec ...