OBD-II code · Powertrain (generic)
P0742 Torque Converter Clutch Circuit Stuck On
The torque converter clutch (TCC) cannot disengage. Symptom is engine stalling when coming to a stop, because the engine is mechanically locked to the transmission output.
Is it safe to drive with P0742?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyTCC solenoid stuck on
- PossibleValve body contaminated
- Less likelyCarbon or debris buildup preventing free movement
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
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–10 h
- Emissions test
- Usually unaffected
- Parts involved
- Torque Converter Clutch Solenoid, Transmission Valve Body
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.