I saw a really old thread on this but my car is in the range of the reported issue. Just picked up a CPO last night and when I got it home, I heard a loud buzzing sound. Figured it might be battery cooling or something else - so I let it be. This morning, I hopped in the car and noticed it right away. Started messing with buttons and when I turned off the ambient lighting, the buzz went away. Anyone else have this issue? What was the resolution for it? If it's something simple, I can do it myself - just trying to avoid having to bring it back to the SC so soon ...