Torque Converter Clutch Solenoid Valve

WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

The PCM energizes the Torque Converter Clutch Pulse Width Modulated (TCC PWM) solenoid valve, which is located on the transmission valve body. The TCC PWM solenoid valve acts on the TCC apply valve to control the torque converter clutch application.

The TCC PWM solenoid valve is pulse width modulated by the PCM. This means that the PCM pulses the solenoid so that the hydraulic pressure against the torque converter clutch modulates. This modulated pressure allows the TCC to slip slightly, thus keeping the TCC balanced just at the point of engagement.

One diagnostic code is associated with the TCC PWM solenoid valve Diagnostic Trouble Code (DTC) P1860, TCC solenoid circuit - electrical, detects a fault in the TCC circuit. While DTC P1860 is set, both 4th gear in hot mode and the TCC are inhibited. Shift adapts do not update and the Malfunction Indicator Light (MIL) illuminates. Recovery can occur on the next ignition cycle.