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 in this section. Some slight TCC slippage is normal.

Fig 1: CODE 67, Schematic, TCC Solenoid Circuit Check

Courtesy of GENERAL MOTORS CORP.

Fig 2: CODE 67, Flowchart, TCC Solenoid Circuit Check

Courtesy of GENERAL MOTORS CORP.