Our automotive experts have put together the following information about the P0439 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 P0439 code.

OBD II Fault Code

  • OBD II P0439

    OBD-II Code Powertrain Control Module (PCM) failure is defined as a Catalyst Heater Control Circuit

    Some Catalytic Converters are electronically heated to get the Catalytic Converter up to operating temperature quicker. If the heating element fails, the engine control module (PCM) will set code P0439.

    Common Problems That Trigger the P0439 Code

    • Catalytic converter failure
    • Catalytic converter failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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