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February 5, 2026 Service bulletin

DTC P218100, P2181F0, and/or P2181F1 (Cooling System Performance) set in the Electronic Control Unit...

Hyundai technical service bulletin 26-EM-004H TSB for 2022-2023 Hyundai Tucson.

Bulletin number
26-EM-004H TSB
Component
Engine
Summary
Some Tucson (NX4, NX4A) vehicles may have DTC P218100, P2181F0, and/or P2181F1 (Cooling System Performance) set in the Electronic Control Unit (ECU), resulting in an illuminated Check Engine warning lamp. This TSB provides instructions to replace the Integrated Thermal Management (ITM) module and update both the Engine Control Module (ECM) and Transmission Control Module (TCM), if applicable. Follow the flowchart in this bulletin to update the appropriate modules.

Owners of these vehicles have filed 139 complaints in the engine category.

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