P0509 Code - Idle Air Control System Circuit High

What Does P0509 Mean?

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

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 P0509.

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What are the common causes of P0509 ?

A carbon coked throttle body bore is by far the most common cause of this code. Other causes include shorted or open electrical circuits, a faulty idle air control valve, a large vacuum leak, or a bad PCM. PCM failure is rare.



How do you troubleshoot P0509 ?

The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P0509 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.

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