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P0742 - Torque Converter Clutch Circuit Stuck On

Possible causes
- 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
What does this mean? What does this mean?
Tech notes
When the a transmission solenoid is stuck on, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced.
What does this mean? What does this mean?
When is the code detected?
The Transmission Control Module (TCM) has detected slippage on the Torque Converter Clutch (TCC) during a period when the converter is commanded off
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0742 Description

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.

P0742 Information for specific makes
P0742 ACURA Torque Converter Clutch Stuck On
P0742 BMW Torque Converter Clutch Stuck On
P0742 BUICK Torque Converter Clutch Circuit Stuck On
P0742 CADILLAC Torque Converter Clutch Circuit Stuck On
P0742 CHEVROLET Torque Converter Clutch Circuit Stuck On
P0742 CHRYSLER Torque Converter Clutch Stuck On
P0742 DODGE Torque Converter Clutch Stuck On
P0742 GMC Torque Converter Clutch Circuit Stuck On
P0742 HYUNDAI Damper Clutch Circuit Stuck On
P0742 ISUZU Torque Converter Clutch Circuit Stuck On
P0742 JEEP Torque Converter Clutch Stuck On
P0742 KIA Torque Converter Clutch Circuit Stuck On
P0742 MAZDA Torque Converter Clutch Circuit Stuck On
P0742 MERCEDES-BENZ Torque Converter Clutch Circuit Stuck On
P0742 MINI Torque Converter Clutch Stuck On
P0742 MITSUBISHI Torque Converter Clutch System Malfunction
P0742 OLDSMOBILE Torque Converter Clutch Circuit Stuck On
P0742 PONTIAC Torque Converter Clutch Circuit Stuck On
P0742 SATURN Torque Converter Clutch Circuit Stuck On
P0742 SUZUKI Torque Converter Clutch Solenoid Performance Or Stuck On
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