with all but 7 removed, does the bike start
yes, 21 volt would fool the CAN bus into thinking it has an issue. I know nothing of the motoscan unit, so don't know if that is correct or something else. lots of chargers used to push high currents to desulphate a battery, so would suggest it is a damaged module. Ebay has this >Ran all the scans again same code 800FFE overvoltage and what I find when scanning the Basic module (BCO) with motoscan is that it shows battery voltage as 21volt motor not running only ignition on, but checking the battery volt meter shows 12,4 volts that explains the system shutdown but I don't know why the basic module sees 21 volt.