gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

Torque Converter Clutch, A/T|Testing and Inspection > < A/T - Intermittent Downshift, Slip or Busy/Cycling TCC|Page 3445
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Torque Converter Clutch: Description and Operation

The ECM controls a solenoid mounted in the automatic transmission. When the vehicle reaches a specified speed, the ECM energizes the solenoid and
the torque converter mechanically couples the engine to the transmission. When the brake is applied, or other conditions indicate that the transmission
should operate as a normal fluid coupled transmission, the solenoid is de-energized.

Torque Converter Clutch, A/T|Testing and Inspection > < A/T - Intermittent Downshift, Slip or Busy/Cycling TCC|Page 3445