P0926 Gear Shift Reverse Actuator Circuit Low

P0926 indicates the gear shift reverse actuator circuit is low. The reverse actuator control path is grounded, missing voltage, or below expected range.

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 assume reverse gear is damaged until the low reverse actuator circuit is tested under load.

Symptoms of P0926

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 P0926

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

Measure reverse actuator command voltage, feed supply, ground integrity, resistance, and current while checking for short-to-ground faults.
Inspect connector pins, harness rub points, relay or fuse supply, module driver output, and actuator winding condition.
Compare the low circuit event with reverse selection attempts, position feedback, reverse inhibit status, and freeze-frame voltage.

Related OBD-II codes

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