Demystifying P0505 Essential Tips for Idle Air Control System Troubleshooting

95.5-2004 Tacomas & 96-2002 4Runners - Code P0505 - Well guys, I just came back from AutoZone and found an error code of P0505: Idle Air ... The P0505 can be caused by a dirty or damaged throttle valve, loose or damaged PCV hose, or carpet obstruction causing the accelerator pedal to be slightly ... The error code you received is for a faulty IAC valve but it probably is related to the idle speed that you fiddled with.... The ECM regulates ... My erratic idle is still just that - erratic. Sometimes the engine speed drops out and dies coming up to a stoplight, and sometimes it doesn't. That is an open or short code for the IAC since you had your engine replaced simply check if it is plugged in. It says most common reasons are Stuck IACV or a vacuum leak. When I suspected IACV problems, I just popped the valve off, 2 bolts, stuck a 9 volt battery to ... P0505 can be caused by not only a bad IACV but also a vacuum leak, misadjusted idle speed, bad ECT sensor/circuit, or bad TPS sensor/circuit. OBD-II fault code P0505 means that the Idle Control System is not managing the engine idle speed properly, which can lead to low, rough, ... The P0505 code can be caused by a faulty idle air control valve, vacuum leak, damaged wires or connectors, an idle speed that isn't calibrated, ... Scion xA/xB 1st-Gen Drivetrain & Power - P0505 woes - Hello all, I have a 2005 xB with 190k miles on it and its been running great besides ...