OBD II Fault Code

  • OBD II P20B8

    OBD-II Code Wiring issue is defined as a Reductant Metering Unit Heater Control Circuit High

    The heating unit for the Reductant (DEF) system ensures that the DEF fluid does not freeze or crystallize between tank and the injector. If the heating unit does not operate as requested, code P20B8 is stored.

    Wiring issue Symptoms

    • DPF regeneration may not occur

    Common Problems That Trigger the P20B8 Code

    • Delivery module heater failure
    • Power heater module power switch failure
    • Wiring issue
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