Aug 04, 2015 · Contact General Motors headquarters by going to the official General Motors website, finding the contact information page and communicating directly online, sending an email message or writing a letter. Communicate with the overall General Motors headquarters, or access the links to communicate with the headquarters of a specific General Motors ...
GENERAL ASSISTANCE GENERAL ASSISTANCE. For questions about your GMC vehicle, new vehicles or your my.gmc.com account: 1-800-462-8782 Monday – Saturday: 8 a.m. to 9 p.m. (EST) Sunday: Closed. For help with adaptive equipment for persons with disabilities: 1-800-323-9935
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