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Our automotive experts have put together the following information about the P04AA diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P04AA code.

OBD II Fault Code

  • OBD II P04AA

    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 P04AA.

    Common Problems That Trigger the P04AA Code

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