TSB 26-AT-005H — Hyundai Service bulletin
26-AT-005H is a service bulletin on file with NHTSA for 2 Hyundai models, 2021–2026 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. This bulletin provides information related to a Transmission Control Unit (TCU) software update for some vehicles equipped with an 8-speed wet dual clutch transmission (8WDCT). The software update revises the touch point learning variation, improving drivability and judder…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years 26-AT-005H names
| Vehicle | Model years |
|---|---|
| Hyundai Santa Fe | 2021, 2022, 2023 |
| Hyundai Sonata | 2021, 2022, 2023, 2024, 2025, 2026 |
Every document filed under 26-AT-005H
| Document ID | Filed | Type |
|---|---|---|
| 26-AT-005H TSB | June 5, 2026 | Service bulletin |
What 26-AT-005H covers
Transmission & drivetrain — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB 26-AT-005H?
26-AT-005H is a service bulletin filed with NHTSA by Hyundai, covering 2 Hyundai models across the 2021–2026 model years. NHTSA's summary reads: This bulletin provides information related to a Transmission Control Unit (TCU) software update for some vehicles equipped with an 8-speed wet dual clutch transmission (8WDCT). The software update revises the touch point learning variation, improving drivability and judder…
Which vehicles does 26-AT-005H cover?
NHTSA's file names Hyundai Santa Fe (2021–2023); Hyundai Sonata (2021–2026). 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-005H a recall, and is the repair free?
No. 26-AT-005H 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-005H?
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-005H, 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-005H. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.