I’ve never had one of these automatic liftgates, but I’m gonna guess here that when the wood got jammed, preventing the gate from closing, the locating mechanism continued to turn, and traveled past the “closed” prox switch. And now when it opens it hits the “closed” switch and thinks it’s closing instead of opening?
I’m gonna *guess* the gate needs to be “recalibrated” to the prox switches (somehow). Maybe the Owner's Manual covers this?
2011 Equinox 1LT (new Jan 2011): Summit White / 3.0 L V6 / FWD / Pioneer Stereo / 18" Wheels / 131.6k miles [14-JUN-2019]
2002 Impala 1LT (new Jun 2002): Summit White / 3.4 L V6 / FWD / Cassette-CD Combo /222.5k miles [13-JUN-2019]