OBD-II code · Powertrain (generic)
P0740 Torque Converter Clutch Circuit Malfunction
A general fault has been detected in the torque converter clutch (TCC) lockup circuit. The TCC mechanically links the engine to the transmission input shaft above a certain speed to eliminate slip and improve fuel economy.
Is it safe to drive with P0740?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyTCC solenoid failed
- PossibleTransmission fluid low or burnt
- Less likelyWiring fault to solenoid
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–10 h
- Emissions test
- Usually unaffected
- Parts involved
- Torque Converter, Tcc Solenoid, Transmission Fluid
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.