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
TuningBot DTC Database · v4.37.14
Generic (OBD-II) interpretation + 1 manufacturer-specific in the TuningBot DTC database.
The control module detected that the measured gear ratio did not match the commanded gear (Gear 4).
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.
Powertrain: engine, transmission and driveline systems.
Generic SAE-standard code: same meaning on every make.
Specific fault index within the subsystem.
Gear 4 - incorrect ratio. The control module detected that the measured gear ratio did not match the commanded gear (Gear 4).
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.
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.
Understand the system behind this code: Diagnostic Strategy and DTC Logic