I had to let an emplyee take my truck to haul a trailer to a jobsite this week. I set my HT to Level 2 and let him go . He said the truck did great (first time it's towed anything) .

Went to raise it back up to Level 3 and I had a U1500 code . I did a search and it says something like "Inter-device Bus 1 ".

Does anyone know what that means ?