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GM has long been known for a bureaucracy that rivals the federal government's, but here it cost the company and its customers dearly. Valukas writes that "group after group and committee after...How do I contact GM customer service?
Contacting General Motors (GM) - by phone or otherwise. While 800-462-8782 is General Motors (GM)'s best toll-free number, there are 3 total ways to get in touch with them.