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P0742
System
Powertrain (Transmission)
Scanner som krävs
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Torque Converter Clutch Circuit Stuck On

Understand P0742, common causes, and the right TOPDON scanner to diagnose it.

TCC stuck engaged — engine may stall at stops or shudder.

Vanliga symptom

  • Stalling when stopping
  • Shudder at low speed
  • Rough idle in gear

Typiska orsaker

  • Stuck TCC solenoid
  • Valve body fault
  • Internal converter clutch welded

Vilken scanner behöver du?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Använd live-data och freeze frame innan du byter delar. ABS-, SRS- och U-koder kräver oftast en fullsystems-scanner.

Diagnostiktips

  • Spara freeze frame när koden först sätts
  • Rensa koden först efter att orsaken är åtgärdad
  • Kontrollera relaterade väntande koder
  • Verifiera batterispänning över 12,4 V innan du misstänker sensorer

Rekommenderade TOPDON-scannrar

Vanliga frågor

What does P0742 mean?
P0742 indicates torque converter clutch circuit stuck on. TCC stuck engaged — engine may stall at stops or shudder.
Can I diagnose P0742 with a basic code reader?
P0742 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for P0742?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with P0742?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.