P0742 Torque Converter Clutch Circuit Stuck On
What does P0742 mean?
P0742 — Torque Converter Clutch Circuit Stuck On. This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects torque converter clutch circuit stuck on. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0742
- TCC lockup staying engaged mechanically
- Shorted TCC solenoid circuit
- Stuck valve body or contaminated fluid debris
- Failing torque converter clutch
- TCM fault
How to fix P0742
- Monitor TCC commanded and actual states on an OBD-II scanner
- Check transmission fluid for debris or contamination
- Test the TCC solenoid operation
- Inspect the valve body for sticking parts
- Replace the torque converter if the clutch will not release