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Service campaign 25-01-083H TSB

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService campaign
NHTSA id11025649
Published by NHTSA2025-11-20
Manufacturer's number25-01-083H TSB
Manufacturer's date2025-11-19
Campaign id or software versionLA11
NHTSA componentENGINE

NHTSA's 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.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine

Trouble codes named

P04DB

Vehicles listed
HYUNDAI TUCSON HYBRID2025 (the catalog's model; the bulletin names a series or trim of it)
HYUNDAI TUCSON PLUG-IN HYBRID2025 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
25V5490002025-08-25. ENGINE AND ENGINE COOLING:CRITICAL FASTENERS

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
26-EM-016H TSB2026-10-14. Service bulletin. Some vehicles equipped with internal combustion engines may exhibit higher-than-expected engine oil consumption. This bulletin outlines the combustion chamber cleaning procedure for vehicles diagnosed with this condition. All internal combustion engines consume some engine oil during normal operation, depending on driving conditions and mileage, and this procedure should only be performed when deemed necessary based on inspection and diagnosis of the vehicle as outlined in TSB 26-EM-015H, Engine Oil Consumption – Inspection & Repair Guidelines, or the latest revision.
26-EM-015H TSB2026-10-13. Service bulletin. Certain vehicles equipped with internal combustion engines may exhibit higher-than-expected engine oil consumption. This bulletin provides the inspection and repair procedures for vehicles exhibiting this condition. All internal combustion engines consume engine oil as part of normal engine operation. Oil consumption rates may vary based on mileage, operating conditions, driving habits, and maintenance history. Hyundai recommends following the prescribed maintenance schedule and periodically checking the engine oil level using the dipstick to maintain proper engine oil level.
26-EM-009H TSB2026-03-30. Service bulletin. Some Sonata (DN8) and Tucson (NX4/NX4A/NX4M) vehicles equipped with the 2.5L Theta III GDI engine may display a warning lamp and store Diagnostic Trouble Code (DTC) P2B59F0, which relates to the Integrated Thermal Management Module (ITM) circuit due to a logic error. This bulletin provides instructions to update the Engine Control Module (ECM) logic to correct this condition.
25-01-083H DCS 01222026-01-27. Service campaign. 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). Technical Service Bulletin (TSB) 25-01-083H provides instructions to perform a software update on the Engine Control Module (ECM) to resolve this condition.
25-01-068H-1 DCS2025-12-02. Service campaign. Certain Tucson Hybrid (NX4 HEV) and Tucson Plug-in Hybrid (NX4 PHEV) vehicles may exhibit a condition where the Oil Pump Unit (OPU) prevents the Ready Lamp from turning on. Some vehicles may also display DTC U100787 (malfunction on CAN communication). Technical Service Bulletin (TSB) 25-01-068H-1 provides instructions to update the Powertrain Control Unit (PCU) software.
25-01-068H-12025-12-02. Service campaign. Certain Tucson Hybrid (NX4 HEV) and Tucson Plug-in Hybrid (NX4 PHEV) vehicles may exhibit a condition where the Oil Pump Unit (OPU) prevents the Ready Lamp from turning on. Some vehicles may also display DTC U100787 (malfunction on CAN communication). This bulletin provides instructions to perform a software update for the Powertrain Control Unit (PCU).
25-01-083H DCS2025-11-20. Service campaign. 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). Technical Service Bulletin (TSB) 25-01-083H provides instructions to perform a software update on the Engine Control Module (ECM) to resolve this condition.