DTC 67, TCC Solenoid Circuit Fault - "G" Series 4L60-E: Notes

Ignition voltage is supplied directly to TCC solenoid. PCM controls solenoid by providing ground path through TCC control circuit. DTC 67 will set when:

PCM commands solenoid on and voltage remains high (B+) for 2 seconds.
PCM commands solenoid off and voltage remains low (zero volts) for 2 seconds.

PCM will default to no TCC and no 4th gear in hot mode.

NOTE: Test numbers refer to numbers on diagnostic chart.

This test checks PCM's ability to control solenoid.
This test checks power supply to TCC solenoid.