P0511 Code - Idle Air Control Circuit Malfunction

What Does P0511 Mean?

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.

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What are the common causes of P0511 ?

• An air leak forward of the DPF will change the sensor readings resulting in the code
• Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
• Fuel with a large percentage of sulfur will clog the DPF quickly

How do you troubleshoot P0511 ?

Fixing an idle air control circuit malfunction may involve:

• Repairing any damaged wiring or connections
• Cleaning the throttle body bore or replacing the throttle body
• Repairing the IAC valve
• Diagnosing and repairing any concurrent DTCs

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