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OBD II Fault Code

  • OBD II P206C

    OBD-II Code Wiring issue is defined as a Reductant Quality Sensor Circuit Low

    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. The PCM uses a Reductant Quality Sensor to monitor the performance of the Reductant system. If the sensor sends back an implausible signal, code P206C is set.

    Wiring issue Symptoms

    • DPF regeneration may not occur

    Common Problems That Trigger the P206C Code

    • DEF contamination
    • Reductant quality sensor failure
    • Selective Catalytic Reduction (SCR) failure
    • Wiring issue
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