Hyundai Tucson Hybrid 2025 — service campaign
Bulletin 25-01-083H TSB · NHTSA communication 11025649 · issued Nov 19, 2025
Service campaign
communication type
Engine
component
2025
model years
2
vehicle entries
Official summary
Certain Tucson Hybrid (NX4 HEV) and Tucson Plug-in Hybrid (NX4 PHEV) vehicles equipped with the 1.6T-GDI Gamma II engine may set DTC P04DB00 (Crankcase Ventilation System Disconnected). This bulletin provides instructions to perform a software update on the Engine Control Module (ECM) to resolve this condition.
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.