P0743 Code: Torque Converter Clutch Circuit Electrical
🟠 Moderate severity · drivable
Drivable, but the torque converter clutch won't lock, reducing fuel economy and adding transmission heat.
What P0743 means
There's an electrical fault in the torque converter clutch (TCC) circuit — the solenoid circuit is open, shorted, or out of range, so the clutch can't be engaged electrically.
Symptoms
- Check engine light is on
- Slightly higher RPMs on the highway
- Reduced fuel economy
- Possible shudder at cruising speed
Common causes
- most common: Faulty torque converter clutch solenoid
- common: Damaged wiring or loose connector in the TCC circuit
- less common: Faulty transmission control module
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Inspect and repair the TCC solenoid wiring and connector | Yes | $10–50 |
| Replace the torque converter clutch solenoid | Mechanic | $100–400 |
Frequently asked questions
Can I drive with a P0743 code?
Yes, but the transmission will run warmer and use more fuel. Get it checked soon.
What is the most common cause of P0743?
A faulty torque converter clutch solenoid, often caused by a wiring or connector problem.
How much does it cost to fix a P0743?
Usually $100–$400 for a solenoid, or less if it's just a wiring repair.
Related codes
P0740
P0740 Code: Torque Converter Clutch Circuit Malfunction
P0741P0741 Code: Torque Converter Clutch Circuit Performance or Stuck Off
P0700P0700 Code: Transmission Control System Malfunction
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.