TSB 26-EM-009H — Hyundai Service bulletin
26-EM-009H is a service bulletin on file with NHTSA for 2 Hyundai models, 2024–2025 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. 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…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years 26-EM-009H names
| Vehicle | Model years |
|---|---|
| Hyundai Sonata | 2024, 2025 |
| Hyundai Tucson | 2024, 2025 |
Every document filed under 26-EM-009H
| Document ID | Filed | Type |
|---|---|---|
| 26-EM-009H TSB | March 24, 2026 | Service bulletin |
What 26-EM-009H covers
Electrical, Engine — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB 26-EM-009H?
26-EM-009H is a service bulletin filed with NHTSA by Hyundai, covering 2 Hyundai models across the 2024–2025 model years. NHTSA's summary reads: 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…
Which vehicles does 26-EM-009H cover?
NHTSA's file names Hyundai Sonata (2024–2025); Hyundai Tucson (2024–2025). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.
Is TSB 26-EM-009H a recall, and is the repair free?
No. 26-EM-009H is repair guidance the manufacturer sent its dealers, not a safety defect finding. You pay for the work unless the vehicle is still under warranty. Recall repairs, by contrast, are always free.
How do I get the full text of 26-EM-009H?
Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under 26-EM-009H, its date, and NHTSA's own summary from the public file.
Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under 26-EM-009H. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.