Hyundai bulletin 24-AT-001H-1
What it saysThis bulletin provides the procedure for updating the automatic transmission TCU (Transmission Control Unit) software to improve shift quality, judder and hesitation when accelerating. NHTSA’s full summary ↓
Hyundai filed this with NHTSA as a service bulletin dated Dec 18, 2024, received Dec 21, 2024, about the power train. It names 4 model years (2021–2022). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis bulletin provides the procedure for updating the automatic transmission TCU (Transmission Control Unit) software to improve shift quality, judder and hesitation when accelerating.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 24-AT-001H-1 | Service bulletin | Dec 18, 2024 | 11012043 | PDF, 345 KB |
What the document itself lists
The manufacturer titles it “TCU UPDATE - ROUGH SHIFT AND HESITATION IMPROVED LOGIC”.
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 39100-2SDJ0 | — | — | |
| 39100-2SDK0 | — | — | |
| 39110-2S163 | — | — | |
| 39110-2S164 | — | — | |
| 39110-2S283 | — | — | |
| 39110-2S161 | — | — | |
| 39110-2S162 | — | — | |
| 39110-2S165 | — | — | |
| 39110-2S166 | — | — | |
| 39110-2S181 | — | — | |
| 39110-2S182 | — | — | |
| 39110-2S280 | — | — | |
| 39110-2S281 | — | — | |
| 39110-2S286 | — | — | |
| 39110-2S287 | — | — | |
| 39110-2S292 | — | — | |
| 39110-2S293 | — | — | |
| 39110-2S171 | — | — | |
| 39110-2S172 | — | — | |
| 39110-2S177 | — | — | |
| 39110-2S173 | — | — | |
| 39110-2S174 | — | — | |
| 39110-2S178 | — | — | |
| 39100-2SDE0 | — | — | |
| 39103-2SDG0 | — | — | |
| 39104-2SDH0 | — | — | |
| 39105-2SDJ0 | — | — |
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 39110F | H7 TCU Update | 0.4 hrs |
Read by machine from the document NHTSA serves (5 pages), read Sep 30, 2026. A part number is shown only where it matches Hyundai’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 4 model years this bulletin names have filed 999 complaints with NHTSA since 2015. 240 of them name Power Train — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
I am very distracted with this NEW car. This is the second time this has happened to my brand new Hyundai Tucson PHEV 2022. I was reversing on a slope, I changed gears to Drive, and then suddenly my car got stuck and stayed on neutral for no reason. Can’t turn off the car, or even change gears anymore. This is terrible!
2022 Hyundai Tucson · Power Train · filed with NHTSA Jul 5, 2023 · ODI 11530552
The contact owns a 2022 Hyundai Sonata. The contact stated while driving 30 MPH, there was a delay while shifting into another gear. The contact stated that the chassis warning light was illuminated. The contact also stated that the front driver’s side door failed to latch and close properly.
2022 Hyundai Sonata · Power Train · filed with NHTSA Jul 24, 2023 · ODI 11534058
When I arrived in the parking lot and selected the R (reverse), the vehicle stayed in the D (Drive) although that it was moving backwards and was able to park it. The shift selector was stuck in DRIVE (Drive) leaving the vehicle on but not operational.
2021 Hyundai Sonata · Power Train · filed with NHTSA Apr 20, 2023 · ODI 11518107
In depth: 2022 Hyundai Santa Cruz transmission and drivetrain problems → · 2022 Hyundai Tucson transmission and drivetrain problems →
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the power train
Source: same model, same component group25 other manufacturer communications filed against these Hyundai models under the same component group (power train), newest first. The eight newest are listed; the rest are on the Hyundai list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LA15 | Warranty extension | Jul 27, 2026 | Certain Sonata (DN8) vehicles may exhibit a transmission oil leak at the bottom of the valve body cover due to a loose oil level plug that c… |
| 26-AT-005H | Service bulletin | Jun 5, 2026 | This bulletin provides information related to a Transmission Control Unit (TCU) software update for some vehicles equipped with an 8-speed w… |
| 26-AT-003H | Service bulletin | May 19, 2026 | Some Santa Fe (MX5A) and Santa Cruz (NXT) vehicles may exhibit a low idle or excessive vibration while in Drive or Reverse, or DTC P050600… |
| LA12 | Warranty extension | Mar 16, 2026 | Certain Santa Cruz (NXT) vehicles equipped with 8-speed dual clutch transmissions (8DCT) may set one of the high pressure electric oil pump… |
| 26-AT-001H | Service bulletin | Mar 3, 2026 | Some Santa Cruz (NXT), Santa Fe (TMA, MX5A), and Sonata (DN8A) models may require replacement of the 8-speed wet dual clutch transmission… |
| 26-AT-002H | Service bulletin | Feb 21, 2026 | Some Santa Fe (TMA) and Tucson (NX4A) vehicles equipped with a 2.5L GDI engine and 8 speed automatic transmission may have DTC U028700… |
| TEJ / TEJA | Service campaign | Oct 8, 2025 | Certain Santa Fe (MX5A) and Santa Cruz (NXT) vehicles equipped with 8-speed dual clutch transmissions (8DCT) may set one of the high pressur… |
| TEJA | Service campaign | Oct 7, 2025 | Certain Santa Cruz (NXT) vehicles equipped with 8-speed dual clutch transmissions (8DCT) may set one of the high pressure electric oil pump… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Hyundai, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Hyundai 24-AT-001H-1 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 24-AT-001H-1 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every Hyundai warranty extension on file lists the ones Hyundai has filed.
Which vehicles does 24-AT-001H-1 cover?
The manufacturer filed it against 4 model years: 2022 Hyundai Santa Cruz, 2022 Hyundai Sonata, 2021 Hyundai Sonata, 2022 Hyundai Tucson. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.