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P0731
System
Powertrain (Transmission)
Benötigter Scanner
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.

Häufige Symptome

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

Typische Ursachen

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

Welchen Scanner brauchen Sie?

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

Nutzen Sie Live-Daten und Freeze Frame, bevor Sie Teile tauschen. ABS-, SRS- und U-Codes erfordern meist einen Vollsystem-Scanner.

Diagnose-Tipps

  • Freeze Frame erfassen, wenn der Code erstmals gesetzt wird
  • Code erst nach Behebung der Ursache löschen
  • Auf verwandte pending codes prüfen
  • Batteriespannung über 12,4 V prüfen, bevor Sie Sensoren verdächtigen

Empfohlene TOPDON Scanner

Häufig gestellte Fragen

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.