P0742: Torque Converter Clutch Circuit Stuck On
Severity: medium
What it means: The computer sees the torque converter clutch (the lockup clutch inside the converter that links engine and transmission at cruising speed) staying engaged when it should release.
Safe to drive? Drive carefully and get it checked. A converter clutch that won't release can stall the engine when you stop or cause shudder.
Common symptoms
- Check engine light
- Shudder or bucking
- Engine stalling when coming to a stop
- Harsh shifts on some cars
Likely causes, ranked
- Faulty torque converter clutch solenoidShop
- Valve body or internal transmission wearShop
- Wiring problemShop
- Worn or contaminated fluidShop
Vehicle-specific notes
- 1998–2002 Oldsmobile Intrigue: On Edmunds, a 2000 Intrigue owner with P0742 and P1811 had the transmission rebuilt for $2,200 after worn parts were found. Another owner with a torque converter code got quotes ranging from a solenoid job to a rebuild. Read the full answer · Source
What it means: The computer sees the torque converter clutch (the lockup clutch inside the converter that links engine and transmission at cruising speed) staying engaged when it should release.
Severity: Medium. Safe to drive? Drive carefully and get it checked. A converter clutch that won't release can stall the engine when you stop or cause shudder.
DIY or shop?
Shop. Diagnosis needs a scan tool, and the solenoid is inside the transmission on many cars.
Before you replace parts
- Read all stored codes and freeze-frame data, not just this one.
- Check your VIN for recalls, service bulletins and extended coverage.
- Inspect wiring and connectors for the related sensor or part before buying parts.
- Clear the code only after a repair, then confirm it stays off.
Safety / mechanic note
Verify with a mechanic. A converter clutch stuck on can stall the engine at a stop. A code points to a circuit or system, not always a specific part.