The toll-free telephone number for GMAC Auto Financing is 1-800-284-2271, as of 2015. It is active Monday through Thursday from 7 a.m to 8 p.m., Friday from 7 a.m. to 7 p.m., and Saturday from 7 a.m. to 4 p.m., CST. Hearing-impaired customers can call 1-888-998-0253 for TDD/TTY services.
These numbers are the same for American and Canadian customers. For investors and media inquiries, GM Financial can be reached at the corporate office by dialing 1-817-302-7000 or toll-free at 1-800-644-2297. Media can also email GM Financial through its website. Information on careers, car titles and other questions can be found by visiting the GM Financial website as well.