How does gm techline customer support work? A GM-Techline Customer Support representative will answer questions and make suggestions; and also will record each problem, question, or suggestion into a special problem tracking system. Any problems that cannot be resolved over the phone will be directed to the appropriate group for resolution. 2003 Service Information User’s Guide iiiHow do i contact techline connect customer support? If you have any questions on Techline Connect, contact the Techline Customer Support Center (TCSC) at 1-800-828-6860 (English) or 1-800-503-3222 (French). – Thanks to Mike Waszczenko GM Service Know-HowHow do i contact techline customer support for corvette? Check the latest version of the GM Dealer Infrastructure Guidelines (DIG) for all required specifications. For assistance with Techline Connect, contact the Techline Customer Support Center (TCSC) at 1-800-828-6860. – Thanks to Lisa Scott 2020 Corvette TAC Action CenterWhat are the hours of operation for the gm customer service center? The GM Service and Parts Operations Techline Customer Support Center telephone lines operate from 8:00 a.m. to 8:00 p.m. (Eastern Standard Time) Monday to Friday.