Its the IAC idle air contorll unit its on the air horn and controlls the air flow at idle This code is saying that something is malfunctioning it is not saying at what RPM it is happening at there is 5 or 6 differant codes for this and they run from P0505 thought P0509 but if you are geting P0505 i would just replace the unit but check the connection to it first it may be a bad connection it dose get weather and heat and that cerates problems with contacts
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