TECHNICAL SERVICE BULLETIN: SERVICE ACTION: ICCU-VCU SOFTWARE UPGRADE (SA560) - This bulletin provides information to improve the electric water pump (EWP) operation logic when the EV battery is being charged with a Level 1 or Level 2 (120-240 volt) AC charger on certain 2024MY EV9 (MV) vehicles produced from September 24, 2023 through January 19, 2024. A deviation may develop between the internal temperature and sensing temperature of the ICCU (Integrated Charging Control Unit) during high-current AC charging and predominantly in cold weather environments. If this condition occurs, the ICCU may become damaged, resulting in a stopped charging session and inability to charge using Level 1 or 2 AC chargers; however, the EV battery can still be charged using Level 3 DC fast charging.
