OnStar Services

See also:

Turning a Function On or Off
1. Turn the Menu knob to highlight the function. 2. Press SELECT to turn the function on or off. ...

Curve Tips
Take curves at a reasonable speed. Reduce speed before entering a curve, while the front wheels are straight. Adjust speed so you can drive through the curve. Maintain a reasonable, steady s ...

Reporting Safety Defects to General Motors
In addition to notifying NHTSA (or Transport Canada) in a situation like this, please notify General Motors. Call 1-800-521-7300, or write: Buick Customer Assistance Center P.O. Box 33136 Detroit, M ...