Are you sure that's not an 8 instead of a B?
Looks like U1XXX is a non-critical CAN bus error and the rest of the code is supposed to tell you which module is having trouble communicating...that's all I could find.
Double check the code, that one does not come up as a valid code. What scan tool did you use to pull it? If you used an IDS you can link directly to OASIS or PC/ED.
Download an program called Forscan. It is a clone of ids and its free. Very powerful and bi-directional.
If it involves the 2017 the author may be able to work with you.