Hyundai Tucson Hybrid 2025 — service campaign
Bulletin 25-01-020H TSB · NHTSA communication 11015676 · issued Mar 11, 2025
Service campaign
communication type
Electrical System
component
2025
model years
2
vehicle entries
Official summary
Certain Tucson Hybrid (NX4 HEV) and Tucson Plug-in Hybrid (NX4 PHEV) vehicles may experience a battery discharge due to a logic error within the Central Communication Unit (CCU). This bulletin provides instructions to update both subsystems (MCU/AP) related to the CCU to improve the logic of the CCU.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.