TSB 26-AT-001H — Hyundai Service bulletin
26-AT-001H is a service bulletin on file with NHTSA for 2 Hyundai models, 2021–2025 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. Some Santa Cruz (NXT), Santa Fe (TMA, MX5A), and Sonata (DN8A) models may require replacement of the 8-speed wet dual clutch transmission (8WDCT) when the vehicle sets one of the high pressure electric oil pump (HP EOP) DTCs listed below. This bulletin provides instructions to…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years 26-AT-001H names
| Vehicle | Model years |
|---|---|
| Hyundai Santa Fe | 2021, 2022, 2023, 2024, 2025 |
| Hyundai Sonata | 2021, 2022 |
Every document filed under 26-AT-001H
| Document ID | Filed | Type |
|---|---|---|
| 26-AT-001H TSB | March 3, 2026 | Service bulletin |
What 26-AT-001H covers
Transmission & drivetrain — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB 26-AT-001H?
26-AT-001H is a service bulletin filed with NHTSA by Hyundai, covering 2 Hyundai models across the 2021–2025 model years. NHTSA's summary reads: Some Santa Cruz (NXT), Santa Fe (TMA, MX5A), and Sonata (DN8A) models may require replacement of the 8-speed wet dual clutch transmission (8WDCT) when the vehicle sets one of the high pressure electric oil pump (HP EOP) DTCs listed below. This bulletin provides instructions to…
Which vehicles does 26-AT-001H cover?
NHTSA's file names Hyundai Santa Fe (2021–2025); Hyundai Sonata (2021–2022). 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-AT-001H a recall, and is the repair free?
No. 26-AT-001H 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-AT-001H?
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-AT-001H, 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-AT-001H. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.