CAN communication from engine control unit One of the CAN messages expected from EMS disappears or is missing. Deterioration in the safety features during drive wheel disengagement. Drive wheel disengagement can be activated even though the conditions relating to engine speed have not been met. If fault codes 11060, 11070, (possibly 11080 or 11090 depending on vehicle specification), 11100 and 11110 have been generated, there is probably a break in the CAN cable to the AWD control unit.