See also:

Reporting Safety Defects
Reporting Safety Defects to the United States Government If you believe that your vehicle has a defect which could cause a crash or could cause injury or death, you should immediately inform the Nati ...

Horn
Pressa on the steering wheel pad to sound the horn. ...

Customer Assistance Offices (U.S. and Canada)
GMC encourages customers to call the toll-free number for assistance. However, if a customer wishes to write or e-mail GMC, the letter should be addressed to: United States GMC Customer Assistance ...