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:
Ride & Handling
Our test CTS had the optional performance suspension, and the car felt as
firm as one of the high-performance V-Series versions that Cadillac sells, with
harsh, jarring responses over bumps. It's ...
Sunroof
If the vehicle has a power sunroof it
will only operate when the ignition is
in ON/RUN or ACC/ACCESSORY,
or when Retained Accessory
Power (RAP) is active. See Ignition
Positions (Key Access) ...
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 1-800-333-0 ...