Torque Converter Clutch Solenoid Valve

The VCM/PCM energizes the Torque Converter Clutch Solenoid Valve (TCC Sol. Valve), which is located on the transmission valve body. The TCC Sol. Valve acts on the TCC apply valve in order to control the torque converter clutch application.

The TCC Sol. Valve is pulse width modulated by the VCM/PCM. This means that the VCM/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 Sol. Valve. Code P1860, TCC Solenoid Circuit Electrical, will detect a fault in the TCC circuit. While Code P1860 is set, both fourth gear in hot mode and the TCC are inhibited. Shift adapt will not update and the MIL will illuminate. Recovery can occur on the next ignition cycle.