CAR OBD CODES

P0509 OBD Code Definition:
P0509 Idle Air Control System Circuit High
P0509 OBD Code Description:

OBD2 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. Symptoms

Possible sumptoms of P0509
– Engine Light ON (or Service Engine Soon Warning Light) – Engine hard to start – Rough or erratic idle speed Possible Causes

Possible causes of 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 Possible 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.
Note: The information on the P0509 error code is purely informative, if you need more useful information, please consult your technician.