The steering wheel is held on simly by a splined shaft, so it's possible that it could have loosened off, but highly unlikely. It's a simple thing to check, disconnect the battery for 20min, then remove the airbag, you'll see the splined shaft right behind the steering wheel. If it's loose there the wheel should pull right off. If it's loose, just take a large socket with an extention and place it on the solid part of the wheel and whack it back into place with a hammer. That's the simple fix. If it's not loose on the spline shaft, then it's something in the steering column and I have yet to pull that apart.