You may have to take both the Truck and attached trailer to Ford for the check out. My co worker had a 2019 fully loaded 450 Ford(diesel) that had issues ONLY when towing. After 45 minutes to 2 hours of towing his NEW 2018 Jayco 36 ft 5th wheel the interior Ford dash Display would go bananas and the truck would go into derate operation phase. It was so bad that even with Ford towing the truck/trailer combo for up to an hour(no fail), they had a Ford team completely deprogram and reprogram the complete Ford computer systems. Did not fix it. Ford bought him out of it before he could Lemon Law it. He purchased another almost identical 450 and has had no problems. There can be Program glitches that cause electrical problems. Doug
