Ok recently had this same issue that just happened, happen again! A few months back took my bike to Harley for a check engine light throwing these similar codes and part numbers P1510 / P2122 / P2138 / P/N 41000210C / B2151 / B2156 / U0184 / P/N 69994-12a…they said the issue was a rear speaker switch that was on and causing the codes and check engine light only issue is I don't have rear speakers so does anyone know where this switch is located or what the dealership was talking about?

FYI, all I did was take the front and back rim and tire off to change the tires and when I reinstalled everything and turn the bike on the check engine light immediately came on

 

Check where you worked. Maybe you caught a wire or a connector.

 

I have checked only issue is that all I disconnected was my speed sensor! I will check though thanks...