Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number7 / 40
Possible causes
- TCC solenoid failed high
- Transmission fluid low or burnt medium
- Wiring fault to solenoid low
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 300–2500 €
- Estimated time: 2–10 h
- Component: torque converter
- Component: tcc solenoid
- Component: transmission fluid
- MIL / check engine light
Sources
References
sae:J2012