With no power and unplugged. Like it was mentioned, you'd have 3rd.
While I have never heard this one before....part of me is thinking, what electronically could do that...

Maybe the pcs bled off too much pressure, hence no hydraulic pressure to engage the forward band. Resetting power either reset the pcm or unstuck the soleniod etc and did the trick. I'd chaulk it up to a single time technical difficulty if it doesn't seem to repeat itself