Harnessing P0505 The Key to Fixing Idle Air Control System Issues

OBD Code P0505 - Idle Air Control System Malfunction ... P0505 is an OBD-II generic code in which the engine control module (ECM) finds out the engine idle ... Code P0505 points to a straightforward issue – an idle control system malfunction. This impacts engine RPMs at idle, causing a rough run. This code comes on for two conditions. When the idle speed isn't the specified amount or a learned value of the idle speed control remains the maximum or ... It seems that the hose doesn't want to stay fully engaged and keeps cocking a bit. I'll pickup a hose clamp tomorrow to help secure the hose. Detailed information on troubleshooting and repairing a P0505 DTC code which refers to a malfunction of the IAC (Idle Air Control) system. Also ... This code is triggered if the IAC pintle is 100% open and the idle RPM is more than 200 RPM lower than the ECM idle RPM setpoint value. It starts right up and idles ~800, perfectly smooth and even. the longer it runs the higher the idle gets, up to around 1100 (900 with AC on) when fully warm. I have a code P0505 for the idle air control system. Truck idles at about 1500 RPM and you can hear a sucking noise from the trottle body where the IAC goes in. P0505 = Adaptive Air Idle Trim (Upper/Lower) Volvo DTC Code EFI-233 Possible source(s) Upper limit:[*]Clogged air cleaner or air intake.[*]Contact resistance ... By description that code (P0505) is an idle speed contol circuit code for a N/A. ... Battery voltage is 10 volts or more. Ignition switch is on.