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:
Deleting Tracks from MEM
Individual tracks and all tracks can be deleted from MEM.
To delete individual tracks, press and release the DEL button while the
track is playing.
To delete all tracks from MEM, press and hold ...
Trailer Wiring Harness
Heavy-Duty Trailer Wiring Harness Package
The vehicle has a seven-pin universal heavy-duty trailer connector attached to
the rear bumper beam next to the integrated trailer hitch.
The seven-wire ...
Radio Message
Locked: Displays when the
TheftLock® system has locked up
the infotainment system. Take the
vehicle to your dealer for service.
If any error occurs repeatedly or if
an error cannot be correct ...