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OBD II Fault Code

  • OBD II P0531

    OBD-II Code Cooling fans may stay on all the time is defined as a A/C Refrigerant Pressure Sensor "A" Circuit Range/Performance

    The engine control module (PCM) uses pressure sensors to monitor the high pressure side of the A/C System. When the pressure gets high, the PCM will command the cooling fans on. If the PCM detects an irrational signal from the sensor, it will set code P0531.

    Cooling fans may stay on all the time Symptoms

    • A/C may not operate
    • Cooling fans may stay on all the time

    Common Problems That Trigger the P0531 Code

    • A/C pressure sensor failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue

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