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OBD II Fault Code

  • OBD II P0904

    OBD-II Code Transmission Control Module (TCM) failure is defined as a Gate Select Position Circuit

    Manual Transmissions have a sensor mounted on the shift lever that tells the engine computer (PCM) what gear the transmission is in. If the Shift Lever Position Sensor sends the PCM an implausible signal, code P0904 is stored. The Shift Lever Position Sensor is usually built into the Shift Lever Assembly.

    Common Problems That Trigger the P0904 Code

    • Shift lever assembly failure
    • Transmission Control Module (TCM) failure
    • Wiring issue
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