NHTSA ID Number: 11023663
Manufacturer Communication Number: 25-01-068H TSB
TSB/Document Date: 2025-10-03
Summary
Certain Tucson Hybrid
(NX4 HEV) and Tucson Plug-in Hybrid (NX4 PHEV) vehicles may exhibit a condition where the Oil Pump Unit (OPU) prevents the Ready Lamp from turning on. Some vehicles may also display DTC U100787 (malfunction on CAN communication). This bulletin provides instructions to update the Powertrain Control Unit (PCU) software.
GROUP
NUMBER
CAMPAIGN
Technical Service Bulletin
25-01-068H
DATE
MODEL(S)
SEPTEMBER 2025
SEE BELOW
OIL PUMP UNIT (OPU) SOFTWARE UPDATE DTC U100787 (SERVICE CAMPAIGN TEK)
SUBJECT:
Description: Certain Tucson Hybrid (NX4 HEV) and Tucson Plug-in Hybrid (NX4 PHEV) vehicles may
exhibit a condition where the Oil Pump Unit (OPU) prevents the Ready Lamp from turning on. Some
vehicles may also display DTC U100787 (malfunction on CAN communication). This bulletin provides
instructions to update the Powertrain Control Unit (PCU) software.
Applicable Vehicles (Certain):
Model Year
Model
Production Dates
2025
Tucson Hybrid (NX4 HEV)
6/9/2025 – 7/16/2025
2025
Tucson Plug-In Hybrid (NX4 PHEV)
6/18/2025 – 6/25/2025
SST Information:
Tool Name
Tool Number
VCI 3
G0VHNNN06
Figure
Ordering Information
Website:
https://hyundaiessentialtools.com/
Email:
[email protected]
VCI 2
G1XDDMN001
Phone: 1-855-763-9199
Hours: 7 AM – 7 PM CST
NOTE: VCI 2 can NO longer be ordered.
GDS Information:
System
Event Number*
Description
PCU
1301
NX4 HEV / PHEV OPU MIL ON IMPROVEMENT
(*or use a later available event listed in the GDS PCU Update screen if one is available.)
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
SUBJECT:
OIL PUMP UNIT (OPU) SOFTWARE UPDATE DTC U100787 (SERVICE CAMPAIGN TEK)
Warranty Information:
Model
Op. Code
Operation
Op.
Time
Causal Part
Nature
Code
Cause
Code
50D206R0
OPU
UPGRADE
0.3 M/H
46190-3D120
I14
ZZ3
Tucson Hybrid
(NX4 HEV)
Tucson Plug-In Hybrid
(NX4 PHEV)
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
ROM ID
Event
System
ECU
Part Number
Current
Latest
1301
OPU
46190-3D120
0094, 0095
0096
Tucson Hybrid
(NX4 HEV)
Tucson Plug-In Hybrid
(NX4 PHEV)
TSB #: 25-01-068H
Page 2 of 6
OIL PUMP UNIT (OPU) SOFTWARE UPDATE DTC U100787 (SERVICE CAMPAIGN TEK)
SUBJECT:
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.
ECU Update Procedure
1.
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 #: 25-01-068H
Page 3 of 6
OIL PUMP UNIT (OPU) SOFTWARE UPDATE DTC U100787 (SERVICE CAMPAIGN TEK)
SUBJECT:
2.
Verify the ROM ID by selecting the OPU
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. Alternatively,
disconnect the negative (–) 12V battery
terminal, wait at least 5 seconds.
Reassemble and retry the update.
3.
Select upgrade event 1301.NX4 / PHEV HEV
OPU MIL ON IMPROVEMENT.
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 #: 25-01-068H
Page 4 of 6
OIL PUMP UNIT (OPU) SOFTWARE UPDATE DTC U100787 (SERVICE CAMPAIGN TEK)
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
Take a screenshot of the ECU update
complete screen using your tablet and
upload to STUI.
TSB #: 25-01-068H
Page 5 of 6
OIL PUMP UNIT (OPU) SOFTWARE UPDATE DTC U100787 (SERVICE CAMPAIGN TEK)
SUBJECT:
7.
Perform an All Systems Fault Code search
and erase DTC history that had incidentally
occurred from the ECU update.
8.
Remove the power connector from the
in-cabin fuse box for at least 5 seconds, then
reconnect it.
i
Information
Alternatively, disconnect the negative (–)
12V battery terminal, wait at least 5
seconds, then reconnect it.
9.
Put vehicle in READY mode to confirm proper
operation of the vehicle.
NOTICE
If the ECU update fails in Auto Mode, perform the update in Manual Mode using the password
below.
Manual Mode Password:
Event
1301
TSB #: 25-01-068H
ECM Menu
NX4KH_OPU_1_461903D120
Password
2674
Page 6 of 6
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TSB/Document ID: 25-01-068H TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2025-10-01
MFR Internal Campaign ID/Software Version: TEK
Communication Type: Service Campaign
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
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