NHTSA ID Number: 11025959
Manufacturer Communication Number: 25-01-061H-1 TSB
TSB/Document Date: 2025-12-02
Summary
Certain Tucson (NX4A) 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.
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TSB/Document ID: 25-01-061H-1 TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2025-11-26
MFR Internal Campaign ID/Software Version: TDFC
Communication Type: Service Campaign
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
GROUP
NUMBER
CAMPAIGN
Technical Service Bulletin
25-01-061H-1
DATE
MODEL(S)
NOVEMBER 2025
TUCSON (NX4A)
DCU SOFTWARE UPDATE
(SERVICE CAMPAIGN TDFC)
SUBJECT:
This TSB supersedes 25-01-061H to add additional information for VCI 2 connection and
IP settings on pages 4-5.
IMPORTANT
Dealers must perform this service campaign on all affected vehicles prior to customer retail delivery
and whenever an affected vehicle is in the shop for any maintenance or repair.
Access the “Vehicle Information” screen via WebDCS to identify open campaigns.
Description: Certain Tucson (NX4A) 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.
Applicable Vehicles (Certain):
Model Year
Model
Production Dates
2025 – 2026
Tucson (NX4A)
06/20/2024 – 08/13/2025
SST Information:
Tool Name
Tool Number
VCI 3
G0VHNNN06
19-Pin Cable
Figure
Remarks
Ordering Information
+
VCI 3 comes with
the 19-pin cable
(P/N G1XDDCA020
included here
for reference)
Website:
https://hyundaiessentialtools.com/
G1XDDCA020
Email:
[email protected]
VCI 2
Ethernet
Communication
Interface (ECI)
Kit
G1XDDMN001
+
G0XDDMN052
If using VCI 2, the
ECI Kit will be
required to
complete software
updates.
Phone: 1-855-763-9199
Hours: 7 AM – 7 PM CST
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
DCU SOFTWARE UPDATE (SERVICE CAMPAIGN TDFC)
SUBJECT:
GDS Information:
Model
System
Event Number*
Description
Tucson
NX4 OB PE/NX4 PE/NX4 PE HEV/NX4 PHEV/NX4a
DCU
1297
(NX4A)
PE/NX4m PE DCU LOGIC IMPROVEMENT (NA)
(*or use a later available event listed in the GDS DCU Update screen if one is available.)
NOTE: The software update is subject to an OTA (Over-the-Air) option and may be completed by
customers with active Bluelink Services subscriptions.
Warranty Information:
Model
Op. Code
Operation
Op. Time
Causal Part
Nature
Code
Cause
Code
Tucson (NX4A)
50DA46R0
DCU Software
Update
0.4 M/H
96510-N9140
M73
ZZ3
NOTE 1: Submit claim on Claim Entry Screen as “Campaign” type.
NOTE 2: If a part is found in need of replacement while performing this campaign and the affected
part is still under warranty, submit a separate claim using the same repair order. If the affected part is
out of warranty, submit a Prior Approval request for goodwill consideration prior to performing the
work.
NOTE 3: This TSB includes repair validation photos. Op times include VIN, mileage, and photo
capture of the ECU Update “Success” screen as outlined in the Digital Documentation Policy.
ROM ID Information:
Model
Tucson
(NX4A)
Event
1297
TSB #: 25-01-061H-1
System
DCU
ECU
Part Number
96510-N9140
ROM ID
Current
Latest
120.NA.011509.011509
120.NA.011606.011606
120.NA.011646.011646
120.NA.011951.011951
120.NA.012054.012054
Page 2 of 8
SUBJECT:
DCU SOFTWARE UPDATE (SERVICE CAMPAIGN TDFC)
Service Procedure:
DIGITAL DOCUMENTATION
This TSB includes repair validation photos. Refer to the latest Warranty Digital Documentation
Policy for requirements.
NOTICE
You must initially perform the GDS ECU update in Auto Mode.
• If the ECU update starts but then fails in Auto Mode, perform the update in Manual Mode
to recover.
NOTICE
Ensure the vehicle’s battery charge is above 11.0 Volts and the tablet’s battery charge is above
30% before performing a software update to avoid update failure.
i
Information
•
Turn OFF all lamps (do NOT leave head lamp switch in auto mode) and all accessories.
•
Perform update with the ignition switch in the ON position.
•
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.
TSB #: 25-01-061H-1
Page 3 of 8
SUBJECT:
DCU SOFTWARE UPDATE (SERVICE CAMPAIGN TDFC)
Configuration of Ethernet Communication on Tablet
VCI 2 Connection (must use ECI kit with USB-C cable attachment):
1.
Connect the ECI DLC connector to the OBD
connector of the vehicle.
2.
Connect the VCI to the receiver module on the
ECI cable.
3.
Connect the ECI cable with the USB-C
connector cable attachment to the tablet.
VCI 3 Connection (use VCI 3 cable):
1.
Connect the 19-pin connector to the bottom of
the VCI 3.
2.
Connect the VCI to the OBD connector of the
vehicle.
3.
Connect the cable with the USB-C connector
to the tablet.
i
•
Information
If using VCI 2, please wait for the Wi-Fi Direct timer to complete to ensure the Wi-Fi Direct
connection is established. Do NOT select Bluetooth Only.
TSB #: 25-01-061H-1
Page 4 of 8
DCU SOFTWARE UPDATE (SERVICE CAMPAIGN TDFC)
SUBJECT:
ECU Update Procedure
1.
Enter the following digits exactly as shown for
IP address, DNS address, Netmask and
Default gateway.
Save and close.
i
Information
Ensure the following IP settings on your
tablet matches the below before
proceeding with the software update.
2.
Perform the ECU update in Auto Mode.
i
Information
Refer to TSB # 25-GI-011H, “ECU
Update Procedure for Tablet-Based
GDS-Smart”, for additional information.
TSB #: 25-01-061H-1
Page 5 of 8
DCU SOFTWARE UPDATE (SERVICE CAMPAIGN TDFC)
SUBJECT:
3.
Verify the ROM ID by selecting the DCU
system to scan the vehicle’s current ROM ID.
NOTICE
Check the current ROM ID version and
compare it to the ROM ID Information
table before attempting to perform the
software update.
NOTICE
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 then
wait at least 5 seconds. Reassemble and
retry the update.
i
Information
The screenshots within this service
procedure refers to Tucson Hybrid
, but is
also applicable to Tucson Internal
Combustion Engine (ICE) vehicles.
4.
After the ECU update process shows 100%
complete, follow the prompts on the screen to
cycle the ignition OFF for at least 10 seconds
to reset the control unit (certain models may
take up to 30 seconds).
i
Information
Use the Refresh button to reset the
timer.
TSB #: 25-01-061H-1
Page 6 of 8
DCU SOFTWARE UPDATE (SERVICE CAMPAIGN TDFC)
SUBJECT:
5.
OTA initialization (A) should perform
automatically:
• If OTA initialization performs
automatically, then proceed with the
service procedure.
•
A
If the OTA initialization process fails,
complete it manually under:
S/W Management > CCU_CCNF Central Communication Unit (CCNF)
> OTA Initialization (B).
Follow the instructions on the screen.
B
6.
DIGITAL
DOCUMENTATION
Using the tablet or GDS screen capture
function, take a screenshot of the ECU
Update “Success” result screen.
Upload the photo to STUI.
NOTE: The VIN/Date/Time/Mileage photo
imprint is NOT required for GDS
screenshots.
TSB #: 25-01-061H-1
Page 7 of 8
SUBJECT:
DCU SOFTWARE UPDATE (SERVICE CAMPAIGN TDFC)
7.
Perform an All Systems Fault Code search
and erase DTC history that had incidentally
occurred from the ECU update.
8.
Start the engine to confirm proper operation of
the vehicle.
9.
The service procedure is now complete.
NOTICE
If the ECU update fails in Auto Mode, perform the update in Manual Mode using the password(s)
below.
Manual Mode Password:
Event
ECU Menu
Password
1297
NX4A PE DCU 96510-N9140
2419
TSB #: 25-01-061H-1
Page 8 of 8
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