I don’t know if this is the same issue I’m having or not but…
Flying the TBM 930 into Portland international (KPDX), programmed runway 28R and without fail every time, when I get close to the airport and switch from GPS to Nav1 to pick up the localizer, autopilot spins my plane around and heads away from the airport. The green arrow is pointing the wrong direction as well. This happens whether I pre program the flight plan or do it after loading in. Flight sim has the correct localizer freq of 111.3 displayed but still does it.
I’ve used ILS to fly into multiple other runways at KPDX and don’t have this issue.