P0742 Code: Torque Converter Clutch Stuck On — Causes & Fix
P0742 means the torque converter clutch (TCC) is staying applied (stuck on) when it should release — the converter won't unlock.
- Applies to
- All OBD-II vehicles (any make or model)
- Est. repair cost
- $100 – $1,500
- Time to fix
- 1–4 hours
What it means
Causes include a stuck TCC solenoid, a valve-body fault, or dirty fluid. P0742 is a generic OBD-II code defined in the SAE J2012 standard, so it applies to virtually any 1996-or-newer OBD-II vehicle regardless of make. Fix the underlying fault, then clear the code with an OBD-II scan tool — it will return if the problem isn't resolved.
Symptoms
- Check engine light on
- Engine stalls when coming to a stop
- Shudder or bucking at low speed
How to fix it
- 1
Check the TCC solenoid and fluid
1. Check fluid condition. 2. Test the TCC solenoid for sticking.
- 2
Service the valve body
1. If the solenoid/fluid are fine, inspect the valve body. 2. Repair, then clear the code.
Frequently asked questions
Why does my car stall at stops with P0742?
If the converter clutch stays locked, the engine is mechanically tied to the wheels and stalls when you stop — like holding a manual clutch out. Fix the TCC solenoid/valve body.
Last updated July 19, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.