Code Definition

P0904 — Gate Select Position Circuit [senses left / right position]

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

About P0904

P0904 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 P0904 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 P0904 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 P0904 fault code is set when the transmission control module (TCM) detects an issue with the gate select position circuit, specifically related to sensing the left/right position of the gear selector. This code suggests a malfunction in the circuit that monitors the lateral (left/right) position of the gear shift mechanism in vehicles with manual or semi-automatic transmissions. The gate select position sensor plays a crucial role in providing feedback to the TCM about the gear selector's lateral position, which is essential for proper gear selection and transmission control. Issues in thi...

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