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P0731
System
Powertrain (Transmission)
Scanner som krävs
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.

Vanliga symptom

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

Typiska orsaker

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

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 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.