service brakes recall

[Snowboss]

Since this last recall on my 2014 Silverado I've had nothing but trouble with 4 wheel drive on my truck. I replaced the Transfer case, TC shift motor, and front shift motor. I still get the occasional service 4 wheel drive message. There are 15 diagnostic codes when I do a scan. They are not OBD codes and the MIL light is not on. The most serious of them are U0077-00 (chassis expansion buss off), and U0073 (communication Buss A off). I took it back to the dealer and they seem to think if it's not exploding then there is no problem. Another code say's (invalid data from the brake control module). I don't want to replace modules that are not faulty. I've spent enough money already. Any and all help and opinions would be greatly appreciated.