Question about 1998 Mitsubishi Galant
This code seems to be "Idle speed control (ISC) system malfunction". Possible causes are wiring,ISC actuator/IAC valve,throttle motor,throttle valve tight or sticking, ECM. Hope this info is useful.
Posted on Nov 08, 2010
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Posted on Jan 02, 2017
SOURCE: Engine Code P0505
After the IAC is replaced it is not enough to clear the code you must also reset the IAC learned adaptive. To do this you will need a higher end scanner like snap-on or such.
Posted on Jun 17, 2010
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