2011 2012 GMC Acadia AM FM Radio mp3 CD Player Auxiliary Input. Guaranteed to be code clear and unlocked upon receipt! Part Number: 20935121. Option Code: UUI. Code Included. This is for a GMC Acadia AM FM radio mp3 CD player that includes auxiliary input. This radio has been unlocked, professionally remanufactured, cleaned, serviced as needed and thoroughly checked. The radio's overall appearance is great. See pictures for more details. This radio is in 100% working order. Blemishes: Very minor wear on the face and chassis. This radio is being sold as a REPLACEMENT ONLY! The part number is 20935121. If you do not have this exact part number currently in your vehicle, it will likely NOT WORK. If you are unsure of your part number, contact us with your VIN and we should be able to provide you with the correct part number. They may look the same and have the same plugs but data streams may be different, not allowing them to code. For example, external amps are used in some cars and will not allow interchange, etc. Although this radio will be unlocked upon installation, please note that if you have Bose or any other specialty sound system, you may have to visit a dealer to get this radio configured properly for your vehicle.