TSB 26-EM-004H — Hyundai Service bulletin
26-EM-004H is a service bulletin on file with NHTSA for the Hyundai Tucson, 2022–2023 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. 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…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years 26-EM-004H names
| Vehicle | Model years |
|---|---|
| Hyundai Tucson | 2022, 2023 |
Every document filed under 26-EM-004H
| Document ID | Filed | Type |
|---|---|---|
| 26-EM-004H TSB | February 5, 2026 | Service bulletin |
What 26-EM-004H covers
Engine — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB 26-EM-004H?
26-EM-004H is a service bulletin filed with NHTSA by Hyundai, covering the Hyundai Tucson across the 2022–2023 model years. NHTSA's summary reads: 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…
Which vehicles does 26-EM-004H cover?
NHTSA's file names Hyundai Tucson (2022–2023). 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-004H a recall, and is the repair free?
No. 26-EM-004H 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-004H?
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-004H, 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-004H. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.