P0740 fault code: what it means

P0740: Torque converter clutch (lock-up) circuit fault.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

faulty torque converter clutch solenoid
damaged wiring
low or dirty transmission fluid

P0740 by make

Ford

Torque converter clutch fault (10R80 in 2018-on Ranger/Everest).

Usual causes: torque converter failure; fluid broken down by heat; TCC control valve or solenoid

Honda

Torque converter lock-up clutch fault. Very common on Odyssey and older Accord V6 automatics, and often a sign of internal transmission wear.

Usual causes: worn transmission internals or torque converter; clutch debris blocking solenoid screens and passages; lock-up (TCC) solenoid; old or wrong ATF

What the repair usually costs

Torque converter replacement (auto / CVT, gearbox out)NZ$1,410–NZ$3,110 · A$1,390–A$3,040
A/C compressor replace incl. drier and flush (European)NZ$1,560–NZ$3,200 · A$1,490–A$3,050
Automatic transmission fluid service, drain and refill (car)NZ$210–NZ$470 · A$210–A$450
Automatic transmission fluid service (SUV / ute / 4WD)NZ$300–NZ$680 · A$290–A$650

Not sure what P0740 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.