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P0734
Systeem
Powertrain (Transmission)
Scanner vereist
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Gear 4 Incorrect Ratio

Understand P0734, common causes, and the right TOPDON scanner to diagnose it.

Fourth gear ratio fault.

Veelvoorkomende symptomen

  • No 4th gear
  • Engine revs high on highway

Typische oorzaken

  • Internal wear
  • Low ATF level
  • Failed 4th clutch or band

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 P0734 mean?
P0734 indicates gear 4 incorrect ratio. Fourth gear ratio fault.
Can I diagnose P0734 with a basic code reader?
P0734 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 P0734?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with P0734?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.