take off your seat, unplug and replug the connectors. do mine about once a year.
in fact, need to do it now. mine quit also

+1.
If it is not showing CB, that means you have lost the connection to the CB, and the controller does not know it is there. You need to unplug and replug the connector several times to make contact again. Might want to tape the connector with black tape when it is working good.
MP