Hyundai Tucson 2025–2026 — service campaign
Bulletin TDF /TDFA/TDFB/TDFC · NHTSA communication 11023121 · issued Sep 12, 2025
Service campaign
communication type
Electrical System
component
2025–2026
model years
4
vehicle entries
Official summary
Hyundai Motor America is currently investigating an ongoing auto mode update concern with software GDS event #1297. Some vehicles are not able to complete the update after multiple attempts and some are completing the update after multiple initial failed attempts. Technicians may experience consistent Data Communication Unit (DCU) software upgrade failures when attempting to update to the latest version. The matter is being investigated to address the update failures and recover any failed modules. We will provide an update once the issue is resolved and the suspension is lifted.
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.