http://www.obd-codes.com/p0505 P0505 IAC (Idle Air Control) System Malfunction http://www.obd-codes.com/p0505 P0505 IAC (Idle Air Control) System Malfunction http://www.obd-codes.com/p0505 P0505 Idle Control System Malfunction http://www.obd-codes.com/p0505 P0505 Idle Control System Malfunction