P0729
Sistema
Powertrain (Transmission)
Escáner necesario
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Gear 6 Incorrect Ratio

Understand P0729, common causes, and the right FOXWELL scanner to diagnose it.

Sixth gear ratio does not match calculated value on 6+ speed automatics.

Síntomas habituales

  • No 6th gear
  • High RPM at highway speed
  • Poor fuel economy

Causas típicas

  • Worn 6th clutch pack
  • Low ATF level
  • Failed solenoid controlling 6th gear
  • Valve body wear

¿Qué escáner necesita?

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

Use datos en vivo y freeze frame antes de cambiar piezas. Códigos ABS, SRS y U suelen requerir un escáner de todos los sistemas.

Consejos de diagnóstico

  • Registre el freeze frame cuando se active el código
  • Borre el código solo tras corregir la causa
  • Revise códigos pendientes relacionados
  • Verifique que la batería esté por encima de 12,4 V antes de sospechar sensores

Escáneres FOXWELL recomendados

Preguntas frecuentes

Can I diagnose P0729 with a basic code reader?
P0729 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with P0729?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.