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:
When It Is Time for New Tires
Factors such as maintenance, temperatures, driving speeds, vehicle loading,
and road conditions affect the wear rate of the tires.
Treadwear indicators are one way to tell when it is time for ...
Listing Stored Numbers
The list command will list all stored
numbers and name tags.
Using the “List” Command
1. Press and hold for
two seconds. For vehicles with a
navigation system say “Hands
Free” after the ton ...
Reporting Safety Defects
to the Canadian
Government
If you live in Canada, and you
believe that the vehicle has a
safety defect, notify Transport
Canada immediately, and notify
General Motors of Canada Limited.
Call Transport Canada at
1-800 ...