OBD codes / P0740
P0740
SeriousTorque Converter Clutch Circuit Malfunction
Address promptly — can worsen or affect drivability.
Likely causes
- low trans fluid
- faulty TCC solenoid
- valve body
Common fixes
- service trans fluid
- test TCC solenoid
Seeing P0740 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0740 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.