See also:

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 ...

Customer Assistance Offices
Buick encourages customers to call the toll-free number for assistance. However, if a customer wishes to write or e-mail Buick, the letter should be addressed to: United States Buick Customer Assis ...

Three-Way Calling
Three-way calling must be supported on the cell phone and enabled by the wireless service carrier. 1. While on a call, press . 2. Say “Three-way call.”. 3. Use the dial or call command to ...