![]() Has anyone had this problem and did you discover that it was the Idle Air Control Valve or something else. But if the P0505 code DOES reset after removing the IAC wires from the PCM connector (or clipping them), replace the PCM, there's a problem internally on the IAC control circuit. Check for voltage on any(At this point there shouldn't be any voltages on the wires because they're clipped at one end and unplugged at the IAC). Check for continuity on all the IAC wires. Now if the code doesn't reset there is a problem with the wiring. If there are no wiring problems, and the code keeps returning with the IAC unplugged, you can check the PCM by removing the IAC wires from the PCM connector (or clipping the wires in a location where they can be repaired easily) and then start the engine (If you're not sure, don't do it. It is possible that the wires could be shorting to eachother or to other wires in the harness. You may need to visually inspect the harness by removing all the insulation off the wires. Visually check the wiring harness all the way back to the PCM. If the code DOES return after unplugging the IAC and starting the engine, then you know it isn't the IAC motor. It is internally shorting one of the IAC circuits. If the P0505 code doesn't reset, replace the IAC. Then unplug the IAC and start the engine (This may cause other IAC codes to set. This should be a fairly straightforward diagnosis. One or more IAC circuits are shorted to voltage.One or more IAC circuits open or shorted to ground.IAC motor connector is damaged (check connector and pins for damage, and moisture).Potential causes of an P0505 code include: Intermittently stalls when letting off the throttle.Engine stalls and may not idle unless throttle is depressed.MIL (Malfunction Indicator Lamp) illumination.NOTE: Problems with the IAC would only be noticeable at idle or when throttle is closed. The PCM monitors voltages of the IAC circuits and if it detects an incorrect voltage on one or more of the IAC motor circuits it will set P0505. Can be a three or four wire sensor depending on the model. The PCM (Powertrain Control Module) uses the IAC valve to keep the idle speed correct with varying engine demands. The more air the IAC allows around the throttle plate, the higher the idle. The IAC has a "plunger" or "shutter" that moves to open or close the bypass air passageway. This metered air controls the idle speed. The IAC is computer controlled and allows only a certain amount of air around the throttle plate. At idle the throttle plate is closed, of course. The IAC (Idle Air Control) valve controls the idle speed of the engine. ![]() Although generic, the specific repair steps may vary depending on make/model. This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. IAC (Idle Air Control) System Malfunction ![]()
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