P0743
Torque Converter Clutch Circuit Electrical
An electrical fault in the torque converter clutch solenoid circuit — open, shorted, or out-of-range driver current. The transmission usually inhibits TCC apply when this code is active.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Common causes
Ordered by how often each turns out to be the cause.
- TCC solenoid electrically failedCommon
- Wiring/connector faultPossible
Parts involved
- Torque Converter Clutch Solenoid
- Solenoid Wiring
P0743 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.