Iccu-vcu s/w upgrade for ewp operation and iccu replacement (SA570)

Bulletin number

TSB_ELE339 (SA570)

Component

Electrical system

Summary

TECHNICAL SERVICE BULLETIN: SERVICE ACTION: ICCU-VCU S/W UPGRADE FOR EWP OPERATION AND ICCU REPLACEMENT (SA570) - 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 25, 2023 through January 11, 2024. A disparity may occur between the actual temperature and sensed temperature of the Integrated Charging Control Unit (ICCU) during high-current AC charging, predominantly in cold weather environments. If this condition occurs, the ICCU may become damaged and exhibit a MIL ‘ON’ with the DTC(s) listed below, 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, and the vehicle's drivability is unaffected.

Owners of these vehicles have filed 104 complaints in the electrical category.