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P0734
System
Powertrain (Transmission)
Scanner som krävs
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.

Vanliga symptom

  • No 4th gear
  • Engine revs high on highway

Typiska orsaker

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

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 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.