P0740 – Torque Converter Clutch Circuit Malfunction
- System
- AT (gearbox)
- Dashboard light
- Check engine light (MIL)
- Check-engine blink code
- —
- Applies to
- Generic OBD-II meaning. Not every code is used by this car.
- Description
- Torque Converter Clutch Circuit Malfunction
- Detection / symptoms
- 1.Check engine light on 2.Minimal decrease in fuel economy, this will not affect engine performance
- Possible causes
- 1.Wiring harness to transmission damaged, loose connection, open or shorted circuit 2.Torque converter clutch (TCC) solenoid 3.Transmission control module (TCM) 4.Diagnostic Steps for P0740 DTC 5.Wiring harness 6.- Check transmission wiring harness for damage or loose connections. Use a factory wiring diagram to locate the appropriate power source and all… 7.Using a digital volt ohm meter (DVOM), set to ohms scale, check for resistance in the circuit with the positive and negative leads on the…
- What to check
- 1.Read the code with a scanner that can read the gearbox computer 2.Check the gearbox fluid level and condition with the correct procedure 3.Check the connector and wiring at the gearbox 4.Have a gearbox specialist confirm before replacing parts
- Confidence
- medium (generic OBD-II definition, not checked against the factory manual for this car)
Generic OBD-II meaning (obd-codes.com), not checked against this car's factory manual. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights