For information about our aftermarket adaptive equipment reimbursement program :
GM Mobility Assistance Center
PO Box 5053
Troy, MI, 48007
WorkPhone: 1-800-323-9935
TTY: 1-800-833-9935
For non-mobility-related vehicle assistance: GM Divisional Customer Assistance
Please click here for a list of the appropriate GM divisional toll-free numbers including TTY/TDD numbers for the hearing-impaired.
OnStar® Subscriber Services
PO Box 1027
Warren, MI, 48090
WorkPhone: 1-888-4ONSTAR (1-888-466-7827)
TTY: 1-877-248-2080