Automotive
GMC Phone Numbers: GMC Information Center (to request literature): 1-888-988-7267 Monday – Friday: 8 a.m. to 9 p.m. Saturday: 9 a.m. to 6 p.m. (EST) GMC Customer Relations Center (for GMC owners): 1-800-462-8782 Monday-Saturday: 8 a.m. to 9 p.m. (EST) Sunday: Closed...
