Following Ive had a similar issue I keep getting bypass codes even after replacing with mopar part it worked for awhile then same as you codes came back took it to dealer they claimed plug by bumper was corroded and quoted 1k to repair it I said no way and checked plug i do not see any corrosion...
So I put LED bulbs in and truck worked but kept geting light out messages then the rear turn signals stopped working completly I switched back to regular bulbs but still no turn signals cant find any fuse or way to fix this