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OBD II Fault Code

  • OBD II P0511

    OBD-II Code Engine idle speed is higher than normal is defined as a Idle Air Control Circuit

    The Idle Control System manages the engine idle speed. To raise or lower the engine Idle speed, the engine control module (PCM), opens or closes the Idle Air Control valve to allow more or less air into the engine. When the PCM cannot achieve the desired RPM, it will set code P0511.

    Engine idle speed is higher than normal Symptoms

    • Engine idle speed is higher than normal
    • Engine stalls when coming to a stop

    Common Problems That Trigger the P0511 Code

    • Idle Air Control (IAC) valve failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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