2005 Ford Focus intake manifold runner control on 2005 Ford Focus

My husband's 2005 Ford Focus check engine light came on and we had it analyzed by our local AutoZone who came up with OEM #P2004; Definition: intake manifold runner control stuck open bank 1; Explanation: ECM has commanded the IMRC closed but detects it open; Probable cause: 1) short circuit condition, 2) damaged IMRC actuator or solemoid, 3) blocked vacuum hoses. I have tried looking for this repair on several sites, but have not come across it yet. Any ideas? I would like to have an idea of how much money we are looking at to repair this. Many thanks!!!

Asked by for the 2005 Ford Focus
most common item is the clip falls off the arm and it does not operate. have it checked at a shop to confirm. could be just a 3 dollar clip

Thank you so much for your prompt reply, Mr. Roy! I will let my husband know what you think and, if it is just that, it would be WONDERFUL! Have a great evening!
Have you gotten that fixed? My car has the exact same trouble code. And where is the IMRC located in the car, I'm not too familiar with the computerized cars, help me.