My SE CC 4x4 has/had only one rattling problem, it was always, always coming from under the rear seat on the passenger side and was driving me crazy. So last night I checked everything and nothing was loose, so I yanked the jack and the tool bag out of the jack holder, put it on the floorboard and placed them under the seat. I drove 70 miles on I-4 this morning which about 75% of it is under construction and I did not here a single rattle. So if anybody else has this same rattle, try taking the jack out of the holder. I am not sure if it the jack or the tools rattling, so I am going to replace the jack and leave the tools out to see what that does...
