The most common causes are: Low or degraded transmission fluid; Failed TCC solenoid; Faulty torque converter; Wiring or connector fault at the transmission; Clogged transmission filter.

How much does it cost to fix P0740?

Typical repairs range from $150–$400 for transmission fluid and filter service up to $800–$2,000 for replace torque converter. Costs vary by vehicle and region.

P0740powertrain

P0740 – Torque Converter Clutch Circuit Malfuction

What does P0740 mean?

The torque converter clutch (TCC) circuit is malfunctioning. The torque converter clutch locks the engine and transmission together at cruising speed to eliminate slippage and improve fuel economy. When it fails to engage as commanded, P0740 sets.

What causes P0740?

Listed from most to least common:

1Low or degraded transmission fluid
2Failed TCC solenoid
3Faulty torque converter
4Wiring or connector fault at the transmission
5Clogged transmission filter
6Internal transmission wear
7Failing transmission control module

Code breakdown

SystemP — Powertrain

TypeGeneric (standardized SAE / OBD-II code — same meaning across most manufacturers)

SubsystemTransmission

Common symptoms

Check engine light on
Shuddering or vibration at steady cruising speed
Noticeably worse fuel economy on the highway
Higher than normal engine RPM at cruise
Transmission running hot
Harsh or erratic shifting

How to diagnose

1Check transmission fluid level and condition first. Dark or burnt-smelling fluid indicates a deeper problem.
2Read transmission module codes for additional detail.
3Inspect the transmission connector and wiring for damage.
4Test the TCC solenoid electrically and check resistance.
5Monitor TCC engagement with live data during a steady-speed test drive.
6Watch for RPM drop when the converter should lock — no drop confirms it is not engaging.

Fuel economy suffers and the transmission runs hotter, which accelerates wear. Shuddering under light load is a common companion symptom that should not be ignored.

Common fixes and estimated costs

Repair	Estimated cost
Transmission fluid and filter service	$150–$400
Repair wiring or connector	$150–$500
Replace TCC solenoid	$250–$700
Replace torque converter	$800–$2,000

Costs are rough US estimates including parts and labor. Actual pricing varies significantly by vehicle, region, and shop rates.

Good to know

Try a proper fluid and filter service before authorizing major work — neglected fluid causes a meaningful share of TCC complaints. Use only the exact fluid specification for your transmission, as the wrong fluid can cause shudder on its own.

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This information is provided for general reference only and may vary by manufacturer, model, and year. It is not a substitute for professional diagnosis or repair.