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