P0744: Torque Converter Clutch Circuit Intermittent

What does P0744 mean?

The TCC circuit intermittently loses correct operation. The clutch may work during one drive and fail during another because of a loose connection, harness fault, or solenoid that changes behavior with heat.

Generic OBD-II definition: Torque Converter Clutch Circuit Intermittent. Confirm applicability in your vehicle service information.

Common causes

• Intermittent transmission harness connection
• Heat-sensitive TCC solenoid
• Intermittent open or short in the control path

Symptoms

• Intermittent check engine light
• Changing cruising RPM
• Reduced fuel economy or lockup irregularity

Diagnostic focus

A cold resistance test can miss a fault that appears only with hot fluid. Relate the event to temperature and movement rather than replacing a converter on an intermittent circuit code.

Can I keep driving with P0744?

Severity: Medium Avoid towing, steep loads, and prolonged driving until diagnosed. Stop and arrange recovery if the transmission slips, loses drive, overheats, or bangs into gear; driving through slip can cause further damage.

If the check engine light is flashing or the car runs badly, stop driving and have it checked.

Typical fixes

• Save temperature and load data from the fault
• Inspect connectors and harness movement
• Graph TCC command and operation during a workshop test

Sources & review

• OBD-Codes.com: P0744
• TroubleCodes.net: generic code definitions

Definitions and diagnostic background checked 2026-11-06. Generic guidance, not a substitute for the service procedure for your exact year, engine, and transmission.