Ford P0509 OBD-II Trouble Code Definition:
P0509 Idle Air Control System Circuit High
P0509 Ford OBD-II Trouble CodeDescription:
OBD Trouble Code P0509
Idle Air Control System Circuit High
What does the code mean? OBD-ii Code P0509 definition:
The ECM has detected that the IAC counts are higher or lower than expected, the engine speed is not in its expected range.
The ECM has detected that the IAC counts are higher or lower than expected, the engine speed is not in its expected range.
Symptoms Sumptoms of OBD code P0509
– Engine Light ON (or Service Engine Soon Warning Light) – Engine hard to start – Rough or erratic idle speed
– Engine Light ON (or Service Engine Soon Warning Light) – Engine hard to start – Rough or erratic idle speed
Causes Causes of the OBD-II code P0509
– 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
– 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
Solutions If there are no intake leaks, clean throttle body, adjust engine idle and erase engine code. If the code comes back you may have to replaced the Electric Throttle Control Actuator (Motor) to repair the problem.