OnStar Services

See also:

Passing
More passing distance is needed when towing a trailer. Because the rig is longer, it is necessary to go much farther beyond the passed vehicle before returning to the lane. ...

Navigation System
If the vehicle has a navigation system, there is a separate navigation system manual that includes information on the radio, audio players, and navigation system. The navigation system prov ...

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 ...