Throttle Position Sensor Malfunction (P0505) Unveiling the Causes and Solutions

A P0505 trouble code will generally trigger the check engine light on. Depending on your vehicle's make, the check engine light may be referred to as the CEL. The IACV valve is operated by a step motor. This motor has winding phases and is actuated by the output signals of ECM. I've replaced the IAC valve, thoroughly cleaned the throttle body and can't find any vacuum leaks. Idles very high and can't figure this out. A code indicating your idle air valve is bad or stuck. Many times a quick clean with carb cleaner fixes the problem. Sometimes a replacement is needed. How to fix a P0505 engine code: Idle Control System. A P0505 code is set when the computer detects the engine RPMs at Idle are erratic. That doesn't mean that the P0505 error code is caused only by the failure of the idle air controller. Want to erase your check engine light and fix your P0505 ... LS - 1st and 2nd Gen (1990-2000) - P0505 Idle control malfunction - Got a CEL this weekend on my '98 LS. I pulled a P0505 code out of it ... Looking at P0505, it does list Idle Control System Malfunction. Unfortunately, it is rather vague. There is no separate IAC valve anymore. Code P0505 ... The most likely item is a vacuum leak providing unmetered air to the engine rising the RPM. Open the hood, remove the side covers ... 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.