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Our automotive experts have put together the following information about the P209A 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 P209A code.

OBD II Fault Code

  • OBD II P209A

    OBD-II Code Powertrain Control Module (PCM) failure is defined as a Reductant Injection Air Pressure Sensor "B" Circuit

    Code P209A is set when an issue is detected with the Reductant Injection Air Pressure Sensor. This sensor is part of the Reductant (DEF) System.

    Common Problems That Trigger the P209A Code

    • Powertrain Control Module (PCM) failure
    • Reductant air pressure sensor
    • Wiring issue
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