P0744
Torque Converter Clutch Circuit Intermittent
The TCC circuit drops in and out — intermittent open or short. Symptoms include erratic shudder at lock-up speeds and intermittent engine stalls when stopping.
- 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.
- Intermittent wiring faultCommon
- TCC solenoid failingPossible
- Connector with intermittent contact under vibrationLess likely
Parts involved
- TCC Solenoid
- Solenoid Wiring
P0744 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.