OBD Code P0742

Torque Converter Clutch Circuit Stuck On

What’s mean?

OBD2 Code P0742 Definition:
The Torque Converter Clutch (TCC) solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter. Lock-up operation, however, is prohibited when A/T fluid temperature is too low. When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

Symptoms

Possible sumptoms of P0742
– Engine Light ON (or Service Engine Soon Warning Light)

Possible Causes

Possible causes of P0742
– Low transmission fluid level – Dirty transmission fluid – Faulty torque converter clutch solenoid valve – Torque converter clutch solenoid valve harness or connectors – Torque converter clutch solenoid valve circuit is open or shorted – Transmission internal mechanical problem The Error code is generally activated on detection of the following conditions: The TCM has detected slippage on the TCC during a period when the converter is commanded off

Possible Solutions