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OBD II Fault Code

  • OBD II P20ED

    OBD-II Code Diagonostic Trouble Code is defined as a SCR nox Pre-Catalyst - Over Temperature

    The engine computer (PCM) monitors the Reductant Catalyst System's use of DEF and its ability to convert NOx to Nitrogen, Carbon Dioxide, and Water. If the Reductant Catalyst fails to perform its job efficiently, code P20ED is set.

    Diagonostic Trouble Code Symptoms

    • DPF regeneration may not occur

    Common Problems That Trigger the P20ED Code

    • DEF contamination
    • DEF injector failure
    • Selective Catalytic Reduction (SCR) failure
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