2025-2026 Hyundai Tucson DCU Software Update
A software error in the Data Communication Unit (DCU) of certain 2025-2026 Hyundai Tucson (NX4A) vehicles could cause telematics services to shut down after one year. Hyundai TSB 25-01-061H-1 provides a software update to resolve this issue.
Também se aplica a
- Hyundai Tucson
- 2026
Hyundai has released Technical Service Bulletin (TSB) 25-01-061H-1, also known as Service Campaign TDFC, to address a software issue affecting the Data Communication Unit (DCU) in certain 2025-2026 Hyundai Tucson (NX4A) vehicles. This bulletin supersedes previous TSB 25-01-061H and provides updated information for VCI 2 connection and IP settings on pages 4-5.
Important Warnings for Owners and Technicians
This service campaign is critical and dealers must perform the update on all affected vehicles prior to customer retail delivery. It also applies whenever an affected vehicle is in the shop for any maintenance or repair. Dealers can identify open campaigns by accessing the “Vehicle Information” screen via WebDCS.
For technicians performing the update, several precautions are necessary:
- You must initially perform the GDS ECU update in Auto Mode. If the ECU update starts but then fails in Auto Mode, you should perform it in Manual Mode to recover.
- Ensure the vehicle's battery charge is above 11.0 Volts and the tablet's battery charge is above 30% before performing the software update to prevent failure.
- Turn OFF all lamps (do NOT leave the headlamp switch in auto mode) and all accessories.
- Do NOT disconnect any cables connected to the vehicle or scan tool during the update.
- Do NOT start the engine during the update.
- Do NOT turn OFF the ignition switch during the update.
- If using VCI 2, wait for the Wi-Fi Direct timer to complete to establish the connection. Do NOT select Bluetooth Only.
- If the update fails, remove the power connector from the in-cabin fuse box for at least 5 seconds, or disconnect the negative (-) 12V battery terminal for at least 5 seconds. Then reassemble and retry the update.
- The VIN/Date/Time/Mileage photo imprint is NOT required for GDS screenshots.
Symptoms of the DCU Software Error
Owners of affected 2025-2026 Hyundai Tucson (NX4A) vehicles may experience a Hyundai Tucson DCU software error where the Data Communication Unit (DCU) module may shut down telematics services after one year of operation. This is due to an internal timer initialization logic not being properly implemented within the DCU software.
Diagnosis and Trigger Conditions
The root cause of the telematics shutdown is an internal timer initialization logic that is not correctly implemented within the DCU software. This condition affects certain Tucson (NX4A) models, specifically those with the ECU Part Number 96510-N9140. The GDS information describes this as
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Frequently Asked Questions
- What is Hyundai TSB 25-01-061H-1 about?
- Hyundai TSB 25-01-061H-1 addresses a software error in the Data Communication Unit (DCU) of certain 2025-2026 Hyundai Tucson (NX4A) vehicles. This error can cause telematics services to shut down after one year of vehicle operation.
- Which Hyundai Tucson models are affected by the DCU software error?
- This issue affects 2025-2026 Hyundai Tucson (NX4A) vehicles produced between June 20, 2024, and August 13, 2025. You can check your vehicle's VIN with a Hyundai dealer to confirm if it is included in Service Campaign TDFC.
- What is the fix for the Hyundai Tucson DCU software error?
- The fix involves performing a software update for the DCU module using specialized tools like the VCI 3 or VCI 2 with an ECI Kit. This update ensures the internal timer initialization logic is correctly implemented, preventing the telematics services from shutting down.
- Can the DCU software update be done over-the-air (OTA)?
- Yes, the software update is subject to an OTA (Over-the-Air) option. Customers with active Bluelink Services subscriptions may have the update completed this way. Otherwise, it must be performed by a dealer.
- What should I do if my 2025-2026 Hyundai Tucson is affected?
- If your 2025-2026 Hyundai Tucson is affected, you should contact your authorized Hyundai dealer to schedule the DCU software update. This update is performed free of charge under the service campaign.
What Hyundai Tucson owners report
Counted from the records in our database across 22 model years.
- 6,738
- Owner complaints
- 37
- Recalls
- 564
- Service bulletins
- 276
- Crashes reported
- 145
- Fires reported
- 256
- Injuries reported
The 2025 model year
451 complaints, the 4th most of 22 model years on file. Owners reported 40 crashes, 2 fires and 25 injuries for this year, which also has 7 recalls on file.
Electrical System, the system this article covers, accounts for 849 of 6,738 complaints (13%), including 126 for 2025.
Complaints by model year
| 2012 | 255 | |
|---|---|---|
| 2013 | 266 | |
| 2014 | 202 | |
| 2015 | 229 | |
| 2016 | 1,626 | |
| 2017 | 1,095 | |
| 2018 | 399 | |
| 2019 | 385 | |
| 2022 | 509 | |
| 2025 | 451 |
Most-reported systems
- Engine — 2,451
- Power Train — 1,273
- Electrical System — 849
- Service Brakes — 761
- Forward Collision Avoidance — 432
Latest recalls for the 2025 model year
- 26V400000 — Electrical System (Jun 2026)
- 26V316000 — Forward Collision Avoidance (May 2026)
- 26V047000 — Electrical System (Jan 2026)
Recent owner reports about electrical system
I was driving home tonight and while driving the car lost all power on the full screen and headlights. This is the second report of the same problem. It was like a blackout at two o clock in the morning. I couldn’t see the speed and the lights went out.
Read owner complaints →Main LED SCREEN Black/Green OUT. BACK UP CAMERA SAFETY FUNCTIONS FAILED & SUFFERED RECURRING FAILURE AFTER BEING SERVICED 3X BY THE DEALER. CORPORATE NOW BEEN PUT ON NOTICE TO DISCUSS TESOLUTION OPTIONS.
Complaints are owner reports filed with NHTSA. They are unverified, and counts depend on how many vehicles were sold, so they are not a failure rate.
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