P0924 Gear Shift Reverse Actuator Circuit/Open

P0924 indicates a gear shift reverse actuator circuit or open-circuit fault. The electrical path used to command reverse actuator movement is incomplete.

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 diagnose reverse gear hardware before verifying the reverse actuator circuit and safety interlocks.

Symptoms of P0924

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 P0924

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

Check reverse actuator feed, ground, driver command, resistance, current draw, connector condition, and circuit continuity under load.
Inspect reverse actuator wiring, transmission connector pins, harness routing, module connector condition, and fluid or water intrusion.
Compare reverse command with gear position feedback and reverse inhibit logic to identify whether the actuator circuit is truly open.

Related OBD-II codes

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