P0505 Ultimate Guide to Understanding Idle Air Control System Malfunctions

The ECM operates only the IAC valve to perform idle–up and provide feedback for the target idling speed. DTC No. DTC Detecting Condition. Trouble Area. P0505. I have a problem with my 04 Grand Cherokee 4.0L. I have the Idle Air System Malfunction Code P0505. I have replaced the IAC and TBS and the ... 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. Idle Air Problem, not IAC valve! (code p0505) · About once every 30 drives, the idle surges. · Every drive, when the engine is up to temp, ... If rough idling of your vehicle has led to you using a scanner tool to check for error codes, chances are you'll run into the code P0505. 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. P0505 means an irregular voltage detected in any IAC circuit. Our expert mobile mechanics can diagnose and fix your P0505 trouble code wherever you are. 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. The P0505 code means there is a short in the IAC valve circuit. I replaced the valve, check the wiring and old valve - both where ok. I'm ... This code happens when the actual idle speed varies from the target idling speed by more than 200 rpm, for five times or more during a drive cycle.