Hyundai Tucson 2025–2026 — service campaign
Bulletin 25-01-061H-1 TSB · NHTSA communication 11025959 · issued Nov 26, 2025
Service campaign
communication type
Electrical System
component
2025–2026
model years
2
vehicle entries
Official summary
Certain Tucson (NX4A) vehicles may exhibit a Data Communication Unit (DCU) software error due to the internal timer initialization logic not being implemented. The DCU module may shut down telematics services after one year. This bulletin provides instructions to perform a software update for the DCU module.
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.