Hyundai service campaign TDF
What it saysCertain Tucson Hybrid (NX4 HEV) and Tucson Plug-in Hybrid (NX4 PHEV) vehicles may exhibit a Data Communication Unit (DCU) software error due to the internal timer initialization logic not being implemented. NHTSA’s full summary ↓
Hyundai filed this with NHTSA as a service campaign dated Nov 13, 2025, received Sep 3, 2025, about the electrical system — 3 documents under this number: 25-01-057H-1 TSB, 25-01-057H TSB (2 filings). It names 1 model year (2025). A service campaign is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
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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.
Certain Tucson Hybrid (NX4 HEV) and Tucson Plug-in Hybrid (NX4 PHEV) vehicles may exhibit a Data Communication Unit (DCU) software error due to the internal timer initialization logic not being implemented. The DCU module may shut down telematics services after one year. This bulletin provides instructions to perform a software update for the DCU module.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 25-01-057H-1 TSB | Service campaign | Nov 13, 2025 | 11025592 | PDF, 699 KB |
| 25-01-057H TSB | Service campaign | Oct 27, 2025 | 11024804 | PDF, 505 KB |
| 25-01-057H TSB | Service campaign | Aug 28, 2025 | 11022375 | PDF, 493 KB |
What the document itself lists
The manufacturer titles it “DCU SOFTWARE UPDATE”.
Part the bulletin names
| Part number | Description | Qty |
|---|---|---|
| 96510-N9140 | — | — |
Read by machine from the document NHTSA serves (8 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.
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 1 model year this bulletin names have filed 453 complaints with NHTSA since 2015. 128 of them name Electrical System — 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 2025 Hyundai Tucson, the 15 owners who gave an odometer reading for Electrical System reported it at a median of 5,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
The HUD will disappear and warning lights will flash on the dashboard. It lasts for about five seconds. Sometimes it happens a few times in a row and then it might not occur again for a couple of days.
2025 Hyundai Tucson · Electrical System · filed with NHTSA Oct 16, 2026 · ODI 11771741
In depth: 2025 Hyundai Tucson electrical 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 electrical system
Source: same model, same component group46 other manufacturer communications filed against the Hyundai Tucson under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Hyundai list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| P38 | Service bulletin | Oct 29, 2026 | Certain Tucson (NX4, NX4A), Tucson Hybrid (NX4 HEV), and Tucson Plug-in Hybrid (NX4 PHEV) vehicles may be eligible for the installation of t… |
| 26-GI-003H | Service bulletin | Oct 27, 2026 | This bulletin provides information related to the navigation and head unit software changes introduced in the 2026 2nd Navigation Map and So… |
| 26-EM-014H | Service bulletin | Sep 16, 2026 | Some Tucson (TL) vehicles equipped with a 2.0L engine may exhibit a continued DTC P132600 after an ECM logic update has been performed per T… |
| 26-BE-025H | Service bulletin | Aug 21, 2026 | Some Tucson (NX4, NX4A, NX4M), Tucson Hybrid (NX4 HEV), and Tucson Plug-In Hybrid (NX4 PHEV) vehicles may exhibit a 12-volt battery drain du… |
| 26-EE-007H | Service bulletin | Jun 17, 2026 | Some Palisade (LX2), Tucson (NX4), and Tucson Hybrid (NX4 HEV) vehicles may experience battery drain due to continuous operation of the cool… |
| 26-GI-002H | Service bulletin | May 27, 2026 | This bulletin provides information related to the navigation and head unit software changes introduced in the 2026 1st Navigation Map and So… |
| LA21 | Warranty extension | May 5, 2026 | Certain Tucson (NX4A) vehicles may experience Over-the-Air (OTA) update failures due to outdated Central Communication Unit (CCU) software.… |
| 9C0 | Service campaign | Apr 8, 2026 | Some vehicles may exhibit a loss of connectivity or interruptions in the middle of using Bluelink functions. This may be due to an occasiona… |
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 TDF a recall?
No. A service campaign 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 TDF repair free?
A service campaign is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does TDF cover?
The manufacturer filed it against 1 model year: 2025 Hyundai Tucson. 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: Tucson Hybrid (NX4 HEV): built 18 Jun 2024 – 4 Aug 2025; Tucson Plug-in Hybrid (NX4 PHEV): built 9 Jul 2024 – 8 Aug 2025 — the build date is on the certification label in the driver’s door jamb.