This may sound dumb but here it is....seems like when I made changes on mine, the changes needed to be balanced. If I took a bulb out of one side, front or rear, it would throw a code. If I removed bulbs on both sides, front or rear, it would be balanced and not throw a code unless I hit the turn sigs. Powering off the bike and turning back on would clear it. When I wired my new single brake light I wired it in to the CENTER brake light wires. I just heat shrinked off the turn sig wires and got no codes. It seems to me the bike is looking for an imbalance from left to right. If you have wired your new brake light to something other than the center brake wires it is seeing an imbalance from right to left and telling you that.