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OBD II Fault Code

  • OBD II P256F

    OBD-II Code A/C may not operate is defined as a A/C Request "B" Circuit Range/Performance

    When the driver requests the A/C to be turned on, a signal goes from the switch to the engine computer (PCM). The PCM then sends power to the A/C Compressor to turn it on. If the Compressor fails to turn on, code P256F will be stored.

    A/C may not operate Symptoms

    • A/C may not operate

    Common Problems That Trigger the P256F Code

    • A/C compressor failure
    • A/C compressor relay failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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