OBD II Fault Code

  • OBD II P0647

    OBD-II Code A/C may not operate is defined as a A/C Clutch Relay Control Circuit High

    The engine control module (PCM) uses a relay to control voltage to the A/C Compressor Clutch. The A/C clutch engages, allowing the Air Conditioning system to operate. When the PCM is unable to control the relay, code P0647 will set.

    A/C may not operate Symptoms

    • A/C may not operate

    Common Problems That Trigger the P0647 Code

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

    Common Repairs Needed for the P0647 Code

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