P0923 Gear Shift Forward Actuator Circuit High

P0923 points to a high gear shift forward actuator circuit. The actuator control path is open, shorted to voltage, or above expected range.

Code status

Needs verification

Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.

System: Transmission
Scope: iso-sae-controlled-p0
Standard: SAE J2012 / ISO 15031-6
Source: legacy-import

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 adaptation or calibration until the high actuator circuit is corrected.

Useful checks before replacing parts

Check forward actuator circuit voltage, continuity, ground, connector fit, open circuits, short-to-voltage faults, and driver state.
Inspect transmission connector terminals, actuator connector sealing, harness damage, and wiring disturbed during clutch or gearbox service.
Compare command and position feedback to determine whether the actuator is disconnected, electrically stuck high, or mechanically blocked.

Related OBD-II codes

These nearby transmission entries can help compare wording and fault area. They may share the same verification status as the source database.