P0740: Torque Converter Clutch Circuit Malfunction
Short answer: P0740 means “Torque Converter Clutch Circuit Malfunction”. It is a standard OBD-II code, so the basic meaning is the same on every car. Below is what it means on each of the 5 cars we cover, with a link to the full page for each car.
Standard OBD-II code Same meaning on all cars (SAE J2012).
P0740 on each car
| Car | Meaning on this car | Confidence |
|---|---|---|
| Toyota Corolla (11th gen, E170) | Torque Converter Clutch Circuit Malfunction | medium |
| Toyota Corolla (10th gen, E140) | Torque Converter Clutch Circuit Malfunction | medium |
| Honda City (5th gen, GM2) | Torque Converter Clutch Circuit Malfunction | medium |
| Honda Civic (10th gen, FC) | Torque Converter Clutch Circuit Malfunction | medium |
| Suzuki Wagon R (Pakistan, K10B) | Torque Converter Clutch Circuit Malfunction | medium |
Symptoms
- Check engine light on
- Minimal decrease in fuel economy, this will not affect engine performance
Likely causes
- Wiring harness to transmission damaged, loose connection, open or shorted circuit
- Torque converter clutch (TCC) solenoid
- Transmission control module (TCM)
- Diagnostic Steps for P0740 DTC
- 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…
- 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, in order
- Read the code with a scanner that can read the gearbox computer
- Check the gearbox fluid level and condition with the correct procedure
- Check the connector and wiring at the gearbox
- Have a gearbox specialist confirm before replacing parts
Causes and checks above are the general meaning. The exact test steps and values differ by car: open your car’s page.