P0927 Gear Shift Reverse Actuator Circuit High

P0927 points to a high gear shift reverse actuator circuit. The reverse actuator control path is open, shorted to voltage, or above the 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 perform actuator relearns or replace reverse hardware until the high circuit condition is corrected.

Symptoms of P0927

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 P0927

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 circuit voltage, continuity, ground path, connector fit, open circuits, short-to-voltage faults, and driver command state.
Inspect transmission connector terminals, actuator connector sealing, harness damage, and wiring disturbed during clutch or gearbox service.
Compare reverse actuator command with position feedback and reverse inhibit status to separate electrical faults from blocked movement.

Related OBD-II codes

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