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Home >> GMC >> 1993 >> Forward Control 4.3 Z, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Transmission >> Trouble Code Charts (4L60-E) >> Code 66, 3-2 Control Solenoid Circuit Fault >> Diagnostic Aids
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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. 3-2 control solenoid feedback normally oscillates on/off when the duty cycle is applied.

Fig 1: CODE 66, Schematic, 3-2 Control Solenoid Circuit Fault
G93I76388Courtesy of GENERAL MOTORS CORP.
Fig 2: CODE 66, Flowchart, 3-2 Control Solenoid Circuit Fault
G93B76399Courtesy of GENERAL MOTORS CORP.
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