TSB 24-AT-001H — Hyundai Service bulletin
24-AT-001H is a service bulletin on file with NHTSA for 2 Hyundai models, 2021 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. This bulletin provides the procedure for updating the automatic transmission TCU and ECU software (Santa Fe ONLY) to improve shift quality, judder with ISG enabled and hesitation when accelerating.
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years 24-AT-001H names
| Vehicle | Model years |
|---|---|
| Hyundai Santa Fe | 2021 |
| Hyundai Sonata | 2021 |
Every document filed under 24-AT-001H
| Document ID | Filed | Type |
|---|---|---|
| 24-AT-001H | February 28, 2024 | Service bulletin |
What 24-AT-001H covers
Transmission & drivetrain — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB 24-AT-001H?
24-AT-001H is a service bulletin filed with NHTSA by Hyundai, covering 2 Hyundai models across the 2021 model years. NHTSA's summary reads: This bulletin provides the procedure for updating the automatic transmission TCU and ECU software (Santa Fe ONLY) to improve shift quality, judder with ISG enabled and hesitation when accelerating.
Which vehicles does 24-AT-001H cover?
NHTSA's file names Hyundai Santa Fe (2021); Hyundai Sonata (2021). 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 24-AT-001H a recall, and is the repair free?
No. 24-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 24-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 24-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 24-AT-001H. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.