P0740 Code: Torque Converter Clutch Circuit Malfunction
🟠 Moderate severity · drivable
Drivable, but the torque converter clutch isn't working, which hurts fuel economy and can overheat the transmission.
What P0740 means
The torque converter clutch (TCC) — which locks the engine to the transmission at highway speed for better fuel economy — has an electrical circuit fault, so it isn't engaging when commanded.
Symptoms
- Check engine light is on
- Slightly higher RPMs at highway speed
- Reduced fuel economy
- Possible shudder at highway speed
- Possible stalling when coming to a stop
Common causes
- most common: Faulty torque converter clutch solenoid
- common: Low or dirty transmission fluid
- less common: Wiring or connector problem at the solenoid
- less common: Internal torque converter clutch failure
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Check and top up transmission fluid | Yes | $20–60 |
| Replace the torque converter clutch solenoid | Mechanic | $100–400 |
| Replace the torque converter if the clutch has failed internally | Mechanic | $800–2000 |
Frequently asked questions
Can I drive with a P0740 code?
Yes, but the transmission may run hotter and use more fuel. Get it checked soon.
What is the most common cause of P0740?
A faulty torque converter clutch solenoid, or low transmission fluid. The solenoid is usually the fix.
How much does it cost to fix a P0740?
A solenoid replacement is $100–$400; a full torque converter replacement is $800–$2,000.
Related codes
P0741
P0741 Code: Torque Converter Clutch Circuit Performance or Stuck Off
P0743P0743 Code: Torque Converter Clutch Circuit Electrical
P0700P0700 Code: Transmission Control System Malfunction
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.