Code Definition

P0923 — Gear Shift Foward Actuator Circuit High

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0923

P0923 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0923 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0923 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0923 fault code is triggered when the control module identifies a high voltage condition in the gear shift forward actuator circuit. This circuit is crucial for managing the engagement of forward gears, particularly odd-numbered gears (1, 3, 5). A high voltage condition suggests an electrical issue within the circuit, such as a short to power or an internal fault within the actuator, which can lead to excessive voltage levels. This abnormal voltage can impair the proper functioning of the gear shift mechanism, potentially causing issues in the engagement or stability of the forward gears.

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