Looking for support for your current GMC or more information on a new GMC? We can help.
Owner’s Manuals, information on available support services, and how-to instructions, tips and general information about the features on your vehicle. Bluetooth®,† OnStar®,† and your GMC Infotainment System† are among the many features covered.
Manage your profile and payments, view vehicle service and diagnostic information.
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Interested in product information or specs for your vehicle or a new GMC?
Send a message to one of our helpful GMC Specialists.
Monday – Sunday: 8 a.m. to 11 p.m. (EST)
The following GMC call centers are available to help during the hours listed below.
For questions about your GMC vehicle, new vehicles or my account information:
For the hearing and speech impaired, please call our Telecommunication Relay service at 711 for assistance.
Monday – Saturday: 8 a.m. to 9 p.m. (EST)
For help with adaptive equipment for persons with disabilities:
Monday – Friday: 8 a.m. to 8 p.m. (EST)
Saturday & Sunday: Closed
For questions about My GMC Rewards and My GMC Rewards Card please call us at:
Monday – Saturday: 9 a.m. to 8 p.m. ET
Please mail your comments, questions or concerns to one of the following Customer Assistance Centers:
In the United States:
GMC Customer Assistance Center
P.O. Box 33172
Detroit, MI 48232-5172
Canada - GM of Canada
1908 Colonel Sam
L1H 8P7, Canada
Mail Code 163-005