2005 Prius P0505 Error code

Hello,

I have a 2005 Prius with almost 244,000 mile and about a week and a half ago the check engine light came on. I went to an Advanced Auto and had them read the code for me, which came back with a P0505 error code. I have read several things on web that this code is a Idle Air Controller related.

I also have read that this could be to a loose or bad PCV valve, an air leak in the vacuum lines, throttle motor shaft might be binding, or a failed engine ECM.

The car runs and idle just fine, no stalling or a rough idling. The only problem that is obvious is that when the car is warm and I come to a stop or put in park, the motor will not shut off.

Which one of these would cause this to happen? Or could this be due to a MAF sensor that needs cleaned or replaced?

Any help would be appreciated.

Thanks

 

I wanted to thank you valde3, I finally had cooperation from the weather this past weekend and disconnected the battery and cleaned the throttle plate. While I was at it I cleaned the MAS sensor with the proper spray I picked up at Advanced Auto along with the throttle plate cleaner. Man was it pretty dirty, I almost used a half a can cleaning the throttle plate. After hooking up the battery and starting, no check engine light, and after a minute from a cold start the engine quit idling like it suppose to.

Thanks again.