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:
Making a Call
Calls can be made using the
following commands.
Dial or Call: The dial or call
command can be used
interchangeably to dial a phone
number or a stored name tag.
Digit Dial: This command allow ...
Trailer Towing
If the vehicle is a hybrid, see the hybrid supplement for more information.
Do not tow a trailer during break-in. See New Vehicle Break-In for
more information.
WARNING
The drive ...
Engine Power Messages
ENGINE POWER IS REDUCED
This message displays and a chime sounds when the cooling system temperature
gets too hot and the engine further enters the engine coolant protection mode. See
Engine Over ...