P0733 Gear 3 Incorrect Ratio

P0733 indicates gear 3 incorrect ratio. The controller calculates a third gear ratio outside expected limits.

Code details

Generic OBD-II · P0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not rebuild from P0733 alone; verify speed data, fluid state, solenoid command, and pressure first.

Symptoms of P0733

Harsh, delayed, or slipping shifts, or being stuck in one gear.
Check-engine light, sometimes with limp-home mode.
Flaring RPM or a shudder under load.

Common causes of P0733

Low or degraded transmission fluid.
A failing speed sensor, shift solenoid, or pressure-control circuit.
Wiring, connector, or internal hydraulic/mechanical faults.

Useful checks before replacing parts

Review input speed, output speed, commanded gear, actual ratio, slip data, fluid temperature, and pressure-control data.
Check related solenoid, speed sensor, and pressure codes that can explain why third gear ratio is wrong.
Identify whether the fault occurs during the 2-3 shift, in steady third gear, or only under load.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.