Diagnostic Aids

Check all connections, especially those at the transmission pass-thru connector. If code is intermittent, see INTERMITTENTS in TESTS W/O CODES article.

Fig 1: CODE 83, Schematic, TCC QDM Fault

Courtesy of GENERAL MOTORS CORP.

Fig 2: CODE 83, Flow Chart, TCC QDM Fault

Courtesy of GENERAL MOTORS CORP.