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P0731
Systeem
Powertrain (Transmission)
Scanner vereist
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Gear 1 Incorrect Ratio

Understand P0731, common causes, and the right TOPDON scanner to diagnose it.

First gear ratio does not match commanded — slipping clutch pack or low fluid.

Veelvoorkomende symptomen

  • Slipping from stop
  • Flare on 1-2 shift
  • Trans overheating

Typische oorzaken

  • Low ATF
  • Worn 1st clutch
  • Failed solenoid
  • Valve body wear

Welke scanner heb je nodig?

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

Gebruik live data en freeze frame voordat je onderdelen vervangt. ABS-, SRS- en U-codes vereisen meestal een full-system scanner.

Diagnosetips

  • Leg freeze frame vast wanneer de code voor het eerst verschijnt
  • Wis de code pas na het oplossen van de oorzaak
  • Controleer op gerelateerde pending codes
  • Controleer of accuspanning boven 12,4 V is voordat je sensoren suspecteert

Aanbevolen TOPDON scanners

Veelgestelde vragen

What does P0731 mean?
P0731 indicates gear 1 incorrect ratio. First gear ratio does not match commanded — slipping clutch pack or low fluid.
Can I diagnose P0731 with a basic code reader?
P0731 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 P0731?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with P0731?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.