Technical Definition:

Torque Converter Clutch Circuit Stuck On

Trouble Code: P0742
Address: 0x0742
System: Powertrain
Subsystem: Transmission Controls
Technical Description:

Modern vehicles equipped with automatic transmissions / transaxles use a torque converter between the engine and transmission to increase the engine torque output and drive the rear wheels.

Possible Causes:

Possible Symptoms:
  • Stuck On Indicator Lamp (MIL) illuminated
  • If the torque converter clutch is actually stuck on, the engine may stall at idle. This is a common problem for certain model GM vehicles, while driving at highway speeds and then coming to a stop the engine dies from the torque converter clutch being stuck on. Usually the engine will restart and resume normal operation.

Torque Converter Clutch Circuit Stuck On

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– 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

Specific Makes:

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