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TuningBot DTC Database · v4.37.14

P0734 Gear 4 - incorrect ratio

Generic (OBD-II) interpretation + 1 manufacturer-specific in the TuningBot DTC database.

P · PowertrainTransmissionOBD2
Brand pages:Ford

Generic (OBD-II) interpretation

P0734
Gear 4 - incorrect ratio Generic · transmission Data confidence 85%

The control module detected that the measured gear ratio did not match the commanded gear (Gear 4).

Possible causes

  • Wiring
  • TR sensor/switch
  • shift solenoids
  • transmission mechanical fault

Manufacturer-specific interpretations

Ford

1 interpretation
P0734:00
incorrect gear 4 ratio Ford · transmission Data confidence 94%

Ford documents P0734:00 (no sub type information) for its 2024-2025 gasoline-engine OBD monitor strategy as incorrect gear 4 ratio. This three-byte interpretation is application-specific and identifies the detected monitor condition rather than a confirmed failed component.

Recommended checks

  • Perform a full module scan
  • Review freeze-frame and occurrence data
  • Compare commanded and measured values
  • Check applicable OEM service information
Applies to Ford gasoline-engine OBD applications|2024-2025 model years

Related and nearby codes

How to read P0734

P

Powertrain: engine, transmission and driveline systems.

0

Generic SAE-standard code: same meaning on every make.

734

Specific fault index within the subsystem.

Frequently asked questions about P0734

What does P0734 mean?

Gear 4 - incorrect ratio. The control module detected that the measured gear ratio did not match the commanded gear (Gear 4).

Is P0734 generic or manufacturer-specific?

P0734 exists both as a generic OBD-II code (same meaning on every make) and with 1 manufacturer-specific interpretation(s): Ford. Always read it in the context of your vehicle.

Can TuningBot remove P0734 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

ECU tuningStage 1 dyno results for Ford engines See the results →

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