P0742: Torque Converter Clutch Circuit Stuck On

What does P0742 mean?

The torque-converter clutch appears to stay applied when it should release. A clutch that remains locked as the vehicle slows can drag the engine down and stall it at a stop.

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

Common causes

• Sticking TCC solenoid or hydraulic valve
• Wiring short keeping the circuit energized
• Internal converter/clutch problem

Symptoms

• Engine stalls when slowing to a stop
• Shudder or harsh engagement
• Check engine light

Diagnostic focus

A vehicle that restarts after stalling can still have the lockup clutch stuck on again at the next stop. Do not treat a successful restart as proof it is safe in traffic.

Can I keep driving with P0742?

Severity: High 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

• Avoid further road use if it stalls
• Compare TCC command and slip with suitable equipment
• Inspect control wiring, solenoid, and hydraulic release operation

Sources & review

• OBD-Codes.com: P0742
• 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.