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OBD II Fault Code

  • OBD II P2804

    OBD-II Code Transmission may not shift properly is defined as a Transmission Range Sensor "B" Circuit Intermittent

    The Transmission Range Sensor (also referred to as the PRNDL input an/or neutral safety switch) tells the transmission control module (TCM) an the engine control module (PCM) that the transmission is in park, reverse, neutral, drive, low, 2nd, 3rd etc. It is attached directly to the manual valve of transmission, so when the shift lever is moved from park to drive, the Transmission Range Sensor communicates this critical information to the above mentioned vehicle control module systems. When the input from the transmission range sensor is erratic or irrational, the PCM will set code P2804.

    Transmission may not shift properly Symptoms

    • Increased fuel consumption
    • Transmission may not shift properly

    Common Problems That Trigger the P2804 Code

    • Powertrain Control Module (PCM) failure
    • Transmission Control Module (TCM) failure
    • Transmission range sensor failure
    • Wiring issue

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