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OBD II Fault Code

  • OBD II P0539

    OBD-II Code A/C may not operate is defined as a A/C Evaporator Temperature Sensor Circuit Intermittent

    The A/C Evaporator Temperature Sensor is used to prevent the evaporator from getting too cold and freezing up. When the engine control module (PCM) detects a problem with this sensor or the signal from it, the PCM will set code P0539.

    A/C may not operate Symptoms

    • A/C may not operate

    Common Problems That Trigger the P0539 Code

    • A/C evaporator temperature sensor failure
    • A/C low side temperature sensor failure
    • High voltage powertrain control module failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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