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:
Antilock Brake System (ABS)
This vehicle has the Antilock Brake System (ABS), an advanced electronic
braking system that helps prevent a braking skid.
When the engine is started and the vehicle begins to drive away, ABS chec ...
Engine Fan
The vehicle has electric cooling fans. The fans spinning at low speed during
most everyday driving might be heard. The fans can turn off if no cooling is required.
Under heavy vehicle loading, tra ...
Scheduling Service Appointments (U.S. and Canada)
When the vehicle requires warranty service, contact your dealer and request an
appointment. By scheduling a service appointment and advising the service consultant
of your transportation needs, yo ...