NHTSA ID Number: 11028667
Manufacturer Communication Number: 26-EM-004H TSB
TSB/Document Date: 2026-02-10
Summary
Some Tucson (NX4, NX4A) vehicles may have DTC P218100, P2181F0, and/or P2181F1 (Cooling System Performance) set in the Electronic Control Unit (ECU), resulting in an illuminated Check Engine warning lamp. This TSB provides instructions to replace the Integrated Thermal Management (ITM) module and update both the Engine Control Module (ECM) and Transmission Control Module (TCM), if applicable. Follow the flowchart in this bulletin to update the appropriate modules.
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TSB/Document ID: 26-EM-004H TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2026-02-05
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
Event
1281
TSB #: 26-EM-004H
Menu
Password
NX4 2.5 GDI ECU 39110-2S105/262
2105
NX4 2.5 GDI ECU 39110-2S107/263
2107
NX4 2.5 GDI ECU 39110-2S119/264
2119
NX4 2.5 GDI ECU 39110-2S113/266
2113
NX4 2.5 GDI ECU 39110-2S116/269
2116
NX4 2.5 GDI ECU 39110-2S302
2302
NX4 2.5 GDI ECU 39110-2S303
2303
NX4 2.5 GDI ECU 39110-2S304
2304
NX4 2.5 GDI ECU 39110-2S307
2307
NX4A 2.5 GDI ECU 39110-2S161/280
2161
NX4A 2.5 GDI ECU 39110-2S162/281
2162
NX4A 2.5 GDI ECU 39110-2S163/283
2163
NX4A 2.5 GDI ECU 39110-2S164/284
2164
NX4A 2.5 GDI ECU 39110-2S170/285
2285
NX4A 2.5 GDI ECU 39110-2S165/286
2165
NX4A 2.5 GDI ECU 39110-2S166/287
2166
NX4A 2.5 GDI ECU 39110-2S181/292
2181
NX4A 2.5 GDI ECU 39110-2S182/293
2182
NX4A 2.5 GDI ECU 39110-2S310
2310
NX4A 2.5 GDI ECU 39110-2S311
2311
NX4A 2.5 GDI ECU 39110-2S313
2313
NX4A 2.5 GDI ECU 39110-2S315
2315
NX4A 2.5 GDI ECU 39110-2S316
2316
NX4A 2.5 GDI ECU 39110-2S317
2317
Page 8 of 18
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT &
ECM/TCU SOFTWARE UPDATE – DTC P218100, P2181F0, P2181F1
SUBJECT:
ECM Update Procedure
i
Information
Perform the ECM software update in Manual Mode (Event #1281). Refer to page 8 and use the
appropriate Manual Mode password.
1.
Perform the ECM update in Manual Mode.
i
Information
Refer to TSB # 25-GI-011H, “ECU
Update Procedure for Tablet-Based
GDS-Smart,” for additional information.
2.
Verify the ROM ID by selecting the ENGINE
system to scan the vehicle's current ROM IDs.
NOTICE
Check the current ROM ID version and
compare it to ROM ID Information
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. Reassemble and
retry the update.
TSB #: 26-EM-004H
Page 9 of 18
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT &
ECM/TCU SOFTWARE UPDATE – DTC P218100, P2181F0, P2181F1
SUBJECT:
3.
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.
4.
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.
5.
Perform an All Systems Fault Code search
and erase DTC history that incidentally
occurred from the ECU update.
TSB #: 26-EM-004H
Page 10 of 18
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT &
ECM/TCU SOFTWARE UPDATE – DTC P218100, P2181F0, P2181F1
SUBJECT:
TCU Update Procedure
1.
Use GDS to check for TCU update in Auto
Mode.
• If it is NOT available, proceed to the
ITM Coolant Filling Mode procedure.
• If update is available, proceed to the
next step.
2.
Perform the TCU update in Auto Mode.
3.
Verify the ROM ID by selecting the AT system
to scan the vehicle's current ROM ID.
Tucson(NX4)/2022/G 2.5 GDI THETA III
NOTICE
Check the current ROM ID version and
compare it to TCU ROM ID Information
before attempting to perform the software
update.
NOTICE
AT | Transmission
1032.NX4 22MY THETA3 2.5GDI TCU S/W IMPROVEMENT FOR ISG LOGIC IMPROVEMENT
NX4 THETA3 2.5GDI ECU S/W IMPROVEMENT
NX4 22MY THETA3 2.5GDI TCU 39110-2S105/19/13
If the update fails, remove the power
connector from the in-cabin fuse box for
at least 5 seconds. Reassemble and
retry the update.
TSB #: 26-EM-004H
Page 11 of 18
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT &
ECM/TCU SOFTWARE UPDATE – DTC P218100, P2181F0, P2181F1
SUBJECT:
4.
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.
5.
Perform an All Systems Fault Code search
and erase DTC history that had incidentally
occurred from the ECU update.
6.
Disconnect the power connector of the indoor
fuse box, wait at least 5 seconds, then
reconnect it.
i
Information
Alternatively, disconnect the negative (–)
12V battery terminal, wait at least
5 seconds, then reconnect it.
TSB #: 26-EM-004H
Page 12 of 18
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT &
ECM/TCU SOFTWARE UPDATE – DTC P218100, P2181F0, P2181F1
SUBJECT:
ITM Coolant Filling Mode
1.
Use GDS to perform the Integrated Thermal
Module Coolant Filling Mode.
Refer to the shop manual:
• Engine Mechanical System >
Cooling System > Coolant > Repair
procedures
!
WARNING
Do NOT remove the radiator cap when
the engine is hot. Serious scalding could
occur by hot fluid under high pressure
escaping from the radiator.
NOTICE
Failure to follow the ITM bleeding
procedure under S/W Management in
GDS may result in air pockets and
overheating of the engine.
2.
Start the vehicle to confirm normal operation.
3.
The service procedure is now complete.
TCU Manual Mode Passwords:
Event
Menu
Password
NX4 22MY THETA3 2.5GDI TCU 39110-2S105/19/13
9105
NX4 22MY THETA3 2.5GDI TCU 39110-2S107/20/14
9107
NX4 22MY THETA3 2.5GDI TCU 39110-2S116/22/18
9116
NX4A 22MY THETA3 2.5GDI TCU 39110-2S161/62/65/66/81/82
9061
NX4A 22MY THETA3 2.5GDI TCU 39110-2S163/64/67/68/84/85
9163
NX4A 22MY THETA3 2.5GDI TCU 39110-2S170/76/86
9170
1032
1034
TSB #: 26-EM-004H
Page 13 of 18
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT &
ECM/TCU SOFTWARE UPDATE – DTC P218100, P2181F0, P2181F1
SUBJECT:
ROM ID Information: Event #1281
Model
Tucson
(NX4)
2022MY
Drivetrain
Latest
39110-2S105
NXDWD5GMAXXXXJ0A
NXDWD5GMAXXXXJ1A
NXDWD5GMAXXXXJ1B
NXDWD5GMAXXXXL8D
39110-2S107
NXDWD5GMCXXXXJ0A
NXDWD5GMCXXXXJ1A
NXDWD5GMCXXXXJ1B
NXDWD5GMCXXXXL8D
39110-2S119
NXDWD5GKAXXXXJ0A
NXDWD5GKAXXXXJ1A
NXDWD5GKAXXXXJ1B
NXDWD5GKAXXXXL8D
39110-2S113
NXDWD5GSAXXXXJ0A
NXDWD5GSAXXXXJ1A
NXDWD5GSAXXXXJ1B
NXDWD5GSAXXXXL8D
39110-2S116
NXDWD5GMKXXXXJ0A
NXDWD5GMKXXXXJ1A
NXDWD5GMKXXXXJ1B
NXDWD5GMKXXXXL8D
39110-2S262
NXDWD5GMAXXXXL6A
NXDWD5GMAXXXXL6B
NXDWD5GMAXXXXL8A
NXDWD5GMAXXXXL8B
NXDWD5GMAXXXXL8D
39110-2S263
NXDWD5GMCXXXXL6A
NXDWD5GMCXXXXL6B
NXDWD5GMCXXXXL8A
NXDWD5GMCXXXXL8B
NXDWD5GMCXXXXL8D
39110-2S264
NXDWD5GKAXXXXL6A
NXDWD5GKAXXXXL6B
NXDWD5GKAXXXXL8A
NXDWD5GKAXXXXL8B
NXDWD5GKAXXXXL8D
39110-2S266
NXDWD5GSAXXXXL6A
NXDWD5GSAXXXXL6B
NXDWD5GSAXXXXL8A
NXDWD5GSAXXXXL8B
NXDWD5GSAXXXXL8D
39110-2S269
NXDWD5GMKXXXXL6A
NXDWD5GMKXXXXL6B
NXDWD5GMKXXXXL8A
NXDWD5GMKXXXXL8B
NXDWD5GMKXXXXL8D
2/4 Wheel
Drive
4 Wheel Drive
TSB #: 26-EM-004H
ROM ID
Current
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