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:
Anti-theft Alarm System Message
SERVICE THEFT DETERRENT SYSTEM
This message displays when there is a problem with the theft-deterrent system.
The vehicle may or may not restart so you may want to take the vehicle to your dealer
...
Services Not Included in Roadside Assistance
Roadside Assistance does not cover or reimburse services for the following:
Events caused by fraud or bad faith by the driver.
Vehicle immobilization situations due to a major force or unforesee ...
Securing an Add-On Child Restraint in the Vehicle
WARNING
A child can be seriously injured or killed in a crash if the child restraint is
not properly secured in the vehicle. Secure the child restraint properly in the
vehicle using the vehicle sa ...