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Our automotive experts have put together the following information about the P206B 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 P206B code.

OBD II Fault Code

  • OBD II P206B

    OBD-II Code Wiring issue is defined as a Reductant Quality Sensor Circuit Range/Performance

    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 P206B is set.

    Wiring issue Symptoms

    • DPF regeneration may not occur

    Common Problems That Trigger the P206B Code

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