Torque Converter Clutch Solenoid/Trans Relay CKT

Name of Code:
12 ($0C) - Torque Converter Clutch (TCC) Solenoid Circuit

When Monitored:
Continuously with the key on.

Set Condition:
This code is set if the voltage detected on the TCC Solenoid Control Circuit at the PCM is different than the expected voltage.

Theory of Operation:
This solenoid is used to control the operation of the TCC. The PCM energizes the solenoid by grounding the TCC Solenoid Control Circuit. The TCC Solenoid receives its 12-volt supply from the transmission relay. The TCC will only engage in 3rd and 4th gears (overdrive). The TCC will not engage when the transmission oil temp is below 32° F.

Transmission Effects:
The PCM turns off the transmission relay resulting in the transmission going into default mode (3rd gear).

Possible Causes:
- Transmission relay failure
- Transmission relay wiring open or shorted
- Open or shorted TCC Solenoid
- Open or shorted TCC Solenoid Control Circuit wiring
- Corroded, damaged, pushed out, miswired, or disconnected connector(s)
- Internal controller failure (PCM)