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What Does P0538 Code Mean?

    OBD-II Code P0538 is defined as a A/C Evaporator Temperature Sensor Circuit High

    The A/C Evaporator Temperature Sensor is used verify proper operation of the A/C system and to prevent the evaporator from getting too cold and freezing up. The engine computer (PCM) looks to see a temperature change when the A/C Compressor is activated. When the engine control module (PCM) does not see a change in temperature with the A/C compressor turned on, the PCM will set code P0538. On hybrid vehicles, this sensor may be controlled and used by the Hybrid Powertrain Control Module.

    P0538 Symptoms

    • A/C may not operate

    Common Problems That Trigger the P0538 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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