I do not have an answer on the reprogramming every time at the dealer but I can't believe that would be designed in. To remove the tailgate you need to unplug the wiring under the vehicle. This includes the round LVDS cable for the camera. This looks like a coax cable with a special connector...
Had the same in mine. It sounded like the rear but we traced it to the driver's side torsion support bar. I found it by rocking the truck and having a buddy climb under. After a few min's we tracked it to this. You could actually move it by hand. When I took it in the tech told me he had seen a...