TransmissionCritical⚠️ Professional Recommended

P0742

Q: What does OBD2 code P0742 mean?

P0742 means: Torque Converter Clutch Stuck On. The TCC is locked when it should not be. This causes stalling when coming to a stop.

Torque Converter Clutch Stuck On

The TCC is locked when it should not be. This causes stalling when coming to a stop.

SeverityCritical

CategoryTransmission

Est. Repair Cost$500–$3000

Code TypePowertrain

DIY RepairProfessional

⚡ Common Causes

›TCC solenoid stuck on
›Valve body fault locking TCC hydraulically
›Mechanical failure inside converter

⚠️ Symptoms

›Engine stalls when stopping
›Rough low-speed driving
›Check engine light
›Shudder at low speed

✅ How to Fix — Step by Step

Step 1:Test TCC solenoid — verify it releases
Step 2:Inspect valve body
Step 3:Replace torque converter
Step 4:Rebuild transmission

🔧 Diagnostic Tools Required

✔OBD-II Diagnostic Scanner
✔Transmission Pressure Gauge
✔ATF Temperature Reader
✔Digital Multimeter
✔Basic Hand Tools

Using the correct diagnostic tools helps identify the root cause of P0742 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: A TCC stuck on causes engine stall at every stop — this is a serious driveability issue requiring immediate repair.

Frequently Asked Questions

What does OBD2 code P0742 mean?+

P0742 stands for Torque Converter Clutch Stuck On. The TCC is locked when it should not be. This causes stalling when coming to a stop.

What causes code P0742?+

TCC solenoid stuck on; Valve body fault locking TCC hydraulically; Mechanical failure inside converter

How do I fix code P0742?+

Test TCC solenoid — verify it releases; Inspect valve body; Replace torque converter; Rebuild transmission

How much does it cost to fix P0742?+

Estimated repair cost for P0742 is $500–$3000.

Is P0742 DIY-friendly?+

P0742 typically requires professional equipment and a qualified mechanic.