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OBD II Fault Code

  • OBD II P0899

    OBD-II Code Transmission may not shift properly is defined as a Transmission Control System MIL Request Circuit High

    The automatic transmission matches the engine optimum power and torque characteristics to the driver's desired rate of acceleration and speed by auto-selecting different gear ratios or 'speeds' to power the wheels. When the Transmission control module (TCM) cannot communicate with the engine computer (PCM) it will send a message to the engine computer (PCM) to set code P0899.

    Transmission may not shift properly Symptoms

    • Increased fuel consumption
    • Transmission may not shift properly

    Common Problems That Trigger the P0899 Code

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

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