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TransmissionSeverity Medium: diagnose soon

P0740Torque Converter Clutch Solenoid Circuit/Open

What it means

The transmission control sees an electrical fault (usually an open circuit) in the torque converter clutch solenoid circuit.

Symptoms

  • Harsh, late or missing shifts
  • Transmission stuck in one gear (limp mode)
  • Check engine or gearbox warning light

Common causes

  • Open solenoid winding
  • Wiring or connector fault (often the transmission harness or its plug)
  • Transmission control module fault

What to check first

  1. Measure the solenoid resistance through the transmission connector
  2. Check the connector for transmission fluid wicking into it
  3. Check supply and control with a scan tool actuation test
Can I drive with P0740? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

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P0740: questions and answers

What does P0740 mean?

P0740: Torque Converter Clutch Solenoid Circuit/Open. The transmission control sees an electrical fault (usually an open circuit) in the torque converter clutch solenoid circuit.

What are the symptoms of P0740?

Harsh, late or missing shifts. Transmission stuck in one gear (limp mode). Check engine or gearbox warning light.

What causes P0740?

Open solenoid winding. Wiring or connector fault (often the transmission harness or its plug). Transmission control module fault.

How do you diagnose P0740?

1. Measure the solenoid resistance through the transmission connector 2. Check the connector for transmission fluid wicking into it 3. Check supply and control with a scan tool actuation test

Can I drive with P0740?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.