P0744 Torque Converter Clutch Circuit Intermittent

P0744 indicates an intermittent torque converter clutch circuit fault. The TCC control path or response drops out inconsistently instead of failing all the time.

Code details

Generic OBD-II · P0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not clear an intermittent TCC code without a heat and vibration check; intermittent wiring can return after a short drive.

Symptoms of P0744

Harsh, delayed, or slipping shifts, or being stuck in one gear.
Check-engine light, sometimes with limp-home mode.
Flaring RPM or a shudder under load.

Common causes of P0744

Low or degraded transmission fluid.
A failing speed sensor, shift solenoid, or pressure-control circuit.
Wiring, connector, or internal hydraulic/mechanical faults.

Useful checks before replacing parts

Review freeze-frame data and TCC slip history to identify speed, temperature, and load when the intermittent fault occurs.
Inspect transmission connectors, internal harness, solenoid connector fit, and wiring that may open under heat or vibration.
Road-test while monitoring TCC command, slip RPM, and solenoid state under the conditions that set the code.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.