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OBD II Fault Code

  • OBD II P04A6

    OBD-II Code Powertrain Control Module (PCM) failure is defined as a Exhaust Pressure Control Valve "B" Position Sensor/Switch Circuit

    The Exhaust Pressure Control Valve controls exhaust back pressure during engine warmup. If the engine control module (PCM) determines there is an incorrect signal from the Exhaust Pressure Control Valve, the PCM will set code P04A6.

    Common Problems That Trigger the P04A6 Code

    • Exhaust pressure control valve failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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