4wd hi is stuck won't shift to 2wd on 2005 Ford E-150

I switched my 2005 ford into 4wd on the go and now its stuck in 4wd and won't shift to 2 wd.

Asked by for the 2005 Ford E-150
Is this one of the Quigley modified Econoline vans?

This is a push button 4x4 yes? If so, and you push the button and it doesn't change back, then the shift motor is likely failing. It is mounted on the transfer case.