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OBD II Fault Code

  • OBD II P20AC

    OBD-II Code Powertrain Control Module (PCM) failure is defined as a Reductant Metering Unit Temperature Sensor Circuit

    The heating unit for the Reductant (DEF) system ensures that the DEF fluid does not freeze or crystallize between tank and the injector. The engine computer monitors the temperature of the system using the Reductant Metering Unit Temperature Sensor. If the temperature sensor sends back an implausible signal, code P20AC is stored.

    Powertrain Control Module (PCM) failure Symptoms

    • DPF regeneration may not occur

    Common Problems That Trigger the P20AC Code

    • Powertrain Control Module (PCM) failure
    • Reductant heating unit temperature sensor failure
    • Wiring issue
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