Hyundai bulletin 26-AT-001H
What it saysSome 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)… NHTSA’s full summary ↓
Hyundai filed this with NHTSA as a service bulletin dated Mar 3, 2026, received Mar 11, 2026, about the power train — 1 document under this number: 26-AT-001H TSB. It names 11 model years (2021–2025). 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 communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
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 replace the 8WDCT.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 26-AT-001H TSB | Service bulletin | Mar 3, 2026 | 11029937 | PDF, 255 KB |
What the document itself lists
The manufacturer titles it “8-SPEED WET DCT REPLACEMENT DUE TO HP EOP”.
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 43000-2N029 | — | — | |
| 43000-2N029RM | — | — | |
| 43000-2N029QQH | — | — | |
| 43000-2N036 | — | — | |
| 43000-2N036RM | — | — | |
| 43000-2N036QQH | — | — | |
| 43000-2N037 | — | — | |
| 43000-2N037RM | — | — | |
| 43000-2N037QQH | Santa Fe | — | eBay Motors → |
| 43000-2N112 | — | — | |
| 43000-2N112RM | — | — | |
| 43000-2N112QQH | — | — | |
| 43000-2N114 | — | — | |
| 43000-2N114RM | — | — | |
| 43000-2N114QQH | Sonata (DN8A) | — | eBay Motors → |
| 43000-2N052 | — | — | |
| 43000-2N052RM | — | — | |
| 43000-2N052QQH | — | — | |
| 00232-19101 | — | — | |
| 00232-19100 | — | — |
Labour operations and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| P086800 | 30DA01RF New 8WDCT Replacement-4WD | 4.1 hrs |
| 30DA01R0 | New 8WDCT Replacement-2WD | 3.8 hrs |
| 30DA01R1 | Reman 8WDCT Replacement-2WD | 3.8 hrs |
| 30DA01R2 | New 8WDCT Replacement-2WD | 3.8 hrs |
| 30DA01R3 | Reman 8WDCT Replacement-2WD | 3.8 hrs |
| P193B79 | 30DA01RV New 8WDCT Replacement-2WD | 3.8 hrs |
| 30DA01R6 | New 8WDCT Replacement-2WD | 3.4 hrs |
Read by machine from the document NHTSA serves (6 pages), read Sep 29, 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 11 model years this bulletin names have filed 1,817 complaints with NHTSA since 2015. 479 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.
On the 2021 Hyundai Santa Fe, the 12 owners who gave an odometer reading for Power Train reported it at a median of 21,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
I have been taking my 21 Santa Fe hybrid limited into the dealership for a year and a half for the same code . Powertrain code P040B00, and to this day they can not repair this issue. I looked it up and a ton of us are having issues with this same code. It should be investigated, and customers should be warned.
2021 Hyundai Santa Fe · Power Train · filed with NHTSA Jul 22, 2023 · ODI 11533831
Two issues with powertrain/transmission: 1- The powertrain/transmission fails intermittently- vehicle RPM goes sky high but vehicle receives no power, seems to fail/lose power. Has happened in very dangerous road conditions where unexpectedly was struggling to get the motor to engage/get power to the vehicle.
2023 Hyundai Santa Fe · Power Train · filed with NHTSA Feb 19, 2025 · ODI 11643753
The car was shaking alot but the engine light was off. Started it the next dat and the check engine light came on. Went to auto zone to see what the codes were. The 1st and 3rd cylinder are misfiring. The car was just serviced for the 60,000 mile tune up in june 2026. This problem started August 14, 2026.
2022 Hyundai Santa Fe · Power Train · filed with NHTSA Aug 16, 2026 · ODI 11757272
In depth: 2022 Hyundai Santa Cruz transmission and drivetrain problems → · 2024 Hyundai Santa Fe transmission and drivetrain problems → · 2023 Hyundai Santa Fe transmission and drivetrain problems → · 2022 Hyundai Santa Fe 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 group28 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 |
|---|---|---|---|
| 999A | Warranty extension | Aug 27, 2026 | Certain Santa Fe Hybrid (MX5A HEV) vehicles may experience a condition where a DTC triggered in the Hybrid Power Control Unit (HPCU) cannot… |
| 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-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 | Service campaign | Oct 24, 2025 | Hyundai Motor America is currently investigating an ongoing concern with software GDS event #1306 for certain Hyundai Santa Fe (MX5A) vehicl… |
| 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… |
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 26-AT-001H 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 26-AT-001H 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 26-AT-001H cover?
The manufacturer filed it against 11 model years: 2025 Hyundai Santa Cruz, 2024 Hyundai Santa Cruz, 2023 Hyundai Santa Cruz, 2022 Hyundai Santa Cruz, 2025 Hyundai Santa Fe, 2024 Hyundai Santa Fe and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: built 3 Jun 2021 – 18 Jun 2025; 2021 - 2023 Santa Fe (TMA): built 20 Nov 2020 – 29 Dec 2023; 2024 - 2025 Santa Fe (MX5A): built 28 Dec 2023 – 7 Jul 2025 — the build date is on the certification label in the driver’s door jamb.