OnStar Services

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Buying New Tires
GM has developed and matched specific tires for the vehicle. The original equipment tires installed were designed to meet General Motors Tire Performance Criteria Specification (TPC Spec) system r ...

Ending Cruise Control
There are three ways to end cruise control: To disengage cruise control, step lightly on the brake pedal. Press on the steering wheel. To turn off the cruise control, press on the steering ...

Design details
Dramatic planes highlight the Cadillac CTS wagon's design, including a V-shaped motif carried throughout the vehicle and carefully integrated intersections of exterior surfaces. The elements coale ...