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Service bulletin 26-HA-002G 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 bulletin
NHTSA id11033845
Published by NHTSA2026-06-16
Manufacturer's number26-HA-002G TSB
Manufacturer's date2026-06-10
NHTSA componentENGINE

NHTSA's summary

Some Genesis vehicles (listed below) equipped with Lambda-III 3.5T-GDI engines may exhibit reduced heater performance due to engine coolant deposits clogging the heater core. This bulletin provides instructions to verify the concern and to replace the front and rear heater core (if applicable).

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

Vehicles listed
GENESIS G802021, 2022, 2023, 2024, 2025
GENESIS G902023, 2024, 2025
GENESIS GV702022, 2023, 2024, 2025, 2026
GENESIS GV802021, 2022, 2023, 2024, 2025

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

Other bulletins for the same vehicles and component
26-01-064G TSB2026-08-11. Warranty extension. Certain 2026MY G70 (IK) and 2027MY G80 (RG3) vehicles may exhibit a water-flowing or gurgling noise from the front center air vents during engine start-up. This condition may be caused by trapped air within the engine cooling system. Follow the procedure below to properly bleed the cooling system and remove any trapped air.
26-01-064G DCS2026-08-11. Warranty extension. Certain 2026MY G70 (IK) and 2027MY G80 (RG3) vehicles may exhibit a water-flowing or gurgling noise from the front center air vents during engine start-up. This condition may becaused by trapped air within the engine cooling system. Technical Service Bulletin (TSB) 26-01-064G provides instructions to properly bleed the cooling system and remove any trapped air.
917G OL2026-06-06. Service campaign. Genesis has become aware that certain vehicles may have IEB modules with incorrectly configured On Board Diagnostic II (OBD II) fault detection signals. In addition, the vehicles may also be releasing pollutants which exceed Federal and California standards.
26-EE-003G TSB2026-04-21. Service bulletin. Some vehicles may exhibit difficulty starting in cold weather. This bulletin provides the procedure to perform an inspection on the starter magnetic switch for potential freezing and, if necessary, replace the starter magnetic switch (solenoid) assembly.
26-EM-008G TSB2026-03-11. Service bulletin. Some GV70 (JK1A) vehicles equipped with 2.5T engines may display a check engine light with DTC P04F000 (EVAP System High Load Purge Line 'A' Performance) due to debris inside the dual purge ejector assembly and/or intercooler outlet hose. This bulletin provides instructions to perform a DTC check, and if necessary, replace the dual purge ejector assembly and intercooler outlet hose.
914G OL2025-11-14. Service campaign. This notice is being sent to you as our records indicate you may have previously received an important Service Campaign notice for Genesis Campaign Number 914G. “Genesis is conducting a service campaign to update the Engine Control Module (ECM) Software for certain 2021 – 2024 model year G80, certain 2022 – 2025 model year GV70, and certain 2021 – 2024 model year GV80 vehicles equipped with 2.5 T-GDI engines.” Genesis has revised the list of vehicles impacted by Campaign 914G and determined that your vehicle IS NOT affected by this service campaign.
916G OL2025-10-18. Service campaign. Genesis has become aware that some vehicles may exhibit a malfunction indicator light with DTC P26CB00 (Engine Coolant Pump Performance/Stuck Off). This may be caused by a stuck impeller on the EWP for the water-cooled intercooler.
25-01-062G DN2025-09-23. Service campaign. Certain GV70 (JK1A) vehicles equipped with 3.5 T-GDI Lambda III engines may exhibit a malfunction indicator light with DTC P26CB00 (Engine Coolant Pump Performance/Stuck Off). This may be caused by a stuck impeller on the electric water pump (EWP) for the water-cooled intercooler. The California Air Resources Board has determined that these vehicles may be releasing air pollutants which exceed Federal and California standards.
25-01-062G TSB2025-09-23. Service campaign. Certain GV70 (JK1A) vehicles equipped with 3.5 T-GDI Lambda III engines may exhibit a malfunction indicator light with DTC P26CB00 (Engine Coolant Pump Performance/Stuck Off). This may be caused by a stuck impeller on the electric water pump (EWP) for the water-cooled intercooler. Follow the procedures in this TSB to check for DTC P26CB00, and if confirmed, replace the electric water pump assembly.
25-01-051 OL2025-09-20. Service campaign. Genesis has become aware that some vehicles may illuminate the Check Engine Light indicator as a result of detected engine misfires.