Hyundai bulletin 26-AT-003H
What it saysSome Santa Fe (MX5A) and Santa Cruz (NXT) vehicles may exhibit a low idle or excessive vibration while in Drive or Reverse, or DTC P050600 (Idle Air Control System – RPM Lower than Expected) caused by the one-way clutch… NHTSA’s full summary ↓
Hyundai filed this with NHTSA as a service bulletin dated May 19, 2026, received Jun 6, 2026, about the power train — 1 document under this number: 26-AT-003H TSB. It names 2 model years (2026). 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 Fe (MX5A) and Santa Cruz (NXT) vehicles may exhibit a low idle or excessive vibration while in Drive or Reverse, or DTC P050600 (Idle Air Control System – RPM Lower than Expected) caused by the one-way clutch sprags being misaligned. This bulletin provides instructions to remove the automatic transmission and replace the torque converter.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 26-AT-003H TSB | Service bulletin | May 19, 2026 | 11033698 | PDF, 1,622 KB |
What the document itself lists
The manufacturer titles it “LOW IDLE OR EXCESSIVE VIBRATION DTC P050600 –”.
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 11234-12406P | Bracket | 1 | eBay Motors → |
| 57799-4D200 | Pin – Split | 2 | eBay Motors → |
| 49557-2D000 | Nut – Driveshaft Lock | 2 | eBay Motors → |
| 11435-10256K | Bolt – Propeller Shaft | 4 | eBay Motors → |
| 00232-19098 | Coolant – Pink Antifreeze | 2 | eBay Motors → |
| 00232-19107 | Quarts | — | eBay Motors → |
Labour operations and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 50DA58R1 | — | 4.9 hrs |
| 50DA58R2 | — | 4.7 hrs |
| 50DA58R3 | — | 4.9 hrs |
Read by machine from the document NHTSA serves (16 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 2 model years this bulletin names have filed 63 complaints with NHTSA since 2015. 2 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.
The contact owns a 2026 Hyundai Santa Cruz. The contact stated that while driving at an undisclosed speed and merging into highway traffic, the vehicle hesitated and surged forward after depressing the accelerator pedal. The vehicle was taken to the dealer; however, the failure could not be duplicated. The vehicle was not repaired.
2026 Hyundai Santa Cruz · Power Train · filed with NHTSA Apr 30, 2026 · ODI 11734862
I was traveling southbound on XXX from to While traveling in this major highway, the vehicle shunted forward and it felt like something hit us from behind. In reality, a transmission issue flared up on the dashboard along with a "Check Engine" light. Vehicle was left at the dealership.
2026 Hyundai Santa Cruz · Power Train · filed with NHTSA Jun 6, 2026 · ODI 11742481
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 group26 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… |
| 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… |
| 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 | 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… |
| 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 26-AT-003H 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-003H 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-003H cover?
The manufacturer filed it against 2 model years: 2026 Hyundai Santa Cruz, 2026 Hyundai Santa Fe. 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: 2026 Santa Fe (MX5A) 2.5T: built 16 Jun 2025 – 7 Oct 2025; Santa Cruz (NXT): built 16 Jun 2025 – 9 Oct 2025 — the build date is on the certification label in the driver’s door jamb.