After a Google of a few key words, I found this forum post.... My excursion was having the EXACT same problem and symptoms... So I decided to take apart the column to have a look...

After examining the wires that lead from the overdrive button, I notice a tiny spot that had rubbed away with exposed wires.... Apparently, this rubbing came from numerous shifting over the last couple years.... I simple wrapped the wire with electrical tape and repositioned the wire to avoid reoccurrence..