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OBD II Fault Code

  • OBD II P20E9

    OBD-II Code Powertrain Control Module (PCM) failure is defined as a Reductant Pressure Too High

    Diesel Exhaust Fluid (DEF) is used to assist in converting leftover exhaust particles to harmless gases. In order to burn off those particles, the temperature of the exhaust system needs to increase. the injection of DEF Fluid into the exhaust stream brings Diesel Particulate Filter (DPF) up to temperature. The system is then able to convert harmful NOx to Nitrogen, Carbon Dioxide, and water. The pressure of this system is monitored by the Reductant Pressure Sensor. If the system pressure gets too high, code P20E9 will be stored.

    Powertrain Control Module (PCM) failure Symptoms

    • DPF regeneration may not occur

    Common Problems That Trigger the P20E9 Code

    • Powertrain Control Module (PCM) failure
    • Reductant pressure sensor failure
    • Selective Catalytic Reduction (SCR) failure
    • Wiring issue
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