Technical Definition:

Idle Air Control System Circuit High

Trouble Code: P0509
Address: 0x0509
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

Idle Air Control System Circuit High

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Dirty throttle body
– Electric throttle control actuator misadjusted or damaged
– Faulty Electric throttle control actuator
– Intake air leak
– Poor electrical connection to the Intake Air Control (IAC) valve

Specific Makes:

– Engine hard to start
– Rough or erratic idle speed

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