NHTSA ID Number: 11028666
Manufacturer Communication Number: 26-EM-003H TSB
TSB/Document Date: 2026-02-10
Summary
Some Sonata (DN8, DN8A) vehicles may have DTCs P218100, P2181F0, and/or P2181F1 (Cooling System Performance) set in the Engine Control Module, resulting in an illuminated Check Engine warning lamp. Follow the procedure in this TSB 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 TSB to update the appropriate modules.
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. Reassemble and
retry the update.
TSB #: 26-EM-003H
Page 8 of 16
SUBJECT:
3.
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
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.
Verify the engine type:
• T-GDI (Event 1244), go to the next
step.
• GDI (Event 1262), go to the TCU
Update procedure.
TSB #: 26-EM-003H
Page 9 of 16
SUBJECT:
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
6.
Perform an All Systems Fault Code search
and erase DTC history that had incidentally
occurred from the ECU update.
7.
Proceed to the ITM Coolant Filling Mode
procedure on page 13.
TSB #: 26-EM-003H
Page 10 of 16
SUBJECT:
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
TCU Update Procedure
1.
Use GDS to check for TCU update in Auto
Mode:
• If is NOT available, go to the ITM
Coolant Filling Mode procedure.
• If update is available, go to the next
step.
2.
Perform the TCU update in Auto Mode.
i
Information
Refer to TSB # 25-GI-011H, “ECU
Update Procedure for Tablet-Based
GDS-Smart”, for additional information.
3.
Verify the ROM ID by selecting the TCU
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
AT | Transmission
1077.DN8a THETA3 2.5GDI TCU S/W IMPROVEMENT FOR ISG LOGIC IMPROVEMENT
DN8a THETA3 2.5GDI ECU S/W IMPROVEMENT
DN8A 2.5 GDI 8AT ISG 39102-2SD80/F0/H0/K0/M0
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-003H
Page 11 of 16
SUBJECT:
5.
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
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.
6.
Perform an All Systems Fault Code search
and erase DTC history that had incidentally
occurred from the ECU update.
7.
Disconnect the power connector (D) of the
indoor fuse box, wait at least 5 seconds, then
reconnect it.
i
Information
D
Alternatively, disconnect the negative (–)
12V battery terminal, wait at least 5
seconds, then reconnect it.
TSB #: 26-EM-003H
Page 12 of 16
SUBJECT:
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
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
be caused by high-pressured, hot fluid to
escape 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 correct operation.
3.
The service procedure is now complete.
TCU Manual Mode Passwords:
Event
Menu
1075
DN8 THETA3 2.5 GDI 8AT ISG 39110-2S038/040/279/072
1077
DN8A THETA3 2.5 GDI 8AT ISG 39102-2SDB0/F0/H0/K0/M0
TSB #: 26-EM-003H
Password
5241
Page 13 of 16
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
SUBJECT:
ROM ID Information:
Model
MY
Event
System
ECU
Part Number
ROM ID
Current
Latest
39111-2S071
DNBWN5TMDCXXXG2A
DNBWN5TMDCXXXG2B
DNBWN5TMDCXXXG2C
DNBWN5TMDCXXXG2D
DNBWN5TMDCXXXG2E
DNBWN5TMDCXXXG2F
2021
39111-2S071
DNBWN5TMDCXXXJ0A
DNBWN5TMDCXXXJ0B
2022
39111-2S076
DNDWN5TMDCXXXJ1A
DNDWN5TMDCXXXJ1B
2023
39111-2S077
DNEWD5TMDCXXXM0A
DNEWD5TMDCXXXM0B
2021
39110-2S037
DNCVD5GMCCXXXG2A
DNCVD5GMCCXXXG2B
DNCVD5GMCCXXXG2C
DNCVD5GMCCXXXL8A
2022
39110-2S039
DNDVD5GMCCXXXJ1A
DNDVD5GMCCXXXJ1B
DNDVD5GMCCXXXJ1C
39110-2S278
DNDVD5GMCCXXXL5A
DNDVD5GMCCXXXL5B
DNDVD5GMCCXXXL8A
DNDVD5GMCCXXXL8B
39110-2S040
DNDVD5GMC3XXXJ1A
DNDVD5GMC3XXXJ1B
DNDVD5GMC3XXXJ1C
39110-2S279
DNDVD5GMC3XXXL5A
DNDVD5GMC3XXXL5B
DNDVD5GMC3XXXL8A
DNDVD5GMC3XXXL8B
2023
39110-2S041
DNEVD5GMCCXXXM0A
DNEVD5GMCCXXXM1A
DNEVD5GMCCXXXM1B
DNEVD5GMCCXXXM1C
2023
ISG
39110-2S042
DNEVD5GMC3XXXM0A
DNEVD5GMC3XXXM1A
DNEVD5GMC3XXXM1B
DNEVD5GMC3XXXM1C
2021
Sonata
(DN8A)
1244
ECU
2022
Sonata
(DN8)
1262
2022
ISG
TSB #: 26-EM-003H
DNDVD5GMCCXXXL8C
DNDVD5GMC3XXXL8C
Page 14 of 16
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
SUBJECT:
Model
MY
Event
System
ECU
Part Number
ROM ID
Current
Latest
39101-2SDA0
DNBVN5GMCCXXXDBB
DNBVN5GMCCXXXDCA
DNBVN5GMCCXXXG2F
DNBVN5GMCCXXXG2G
DNBVN5GMCCXXXG2H
DNBVN5GMCCXXXL8A
39102-2SDB0
DNBVN5GMC3XXXDBB
DNBVN5GMC3XXXDCA
DNBVN5GMC3XXXG2F
DNBVN5GMC3XXXG2G
DNBVN5GMC3XXXG2H
DNBVN5GMC3XXXL8A
39103-2SDE0
DNCVN5GMCCXXXF0A
DNCVN5GMCCXXXG2F
DNCVN5GMCCXXXG2G
DNCVN5GMCCXXXG2H
39100-2SDG0
DNCVN5GMCCXXXG2A
DNCVN5GMCCXXXG2B
DNCVN5GMCCXXXG2C
DNCVN5GMCCXXXG2D
39100-2SDH0
DNCVN5GMC3XXXG2A
DNCVN5GMC3XXXG2B
DNCVN5GMC3XXXG2C
DNCVN5GMC3XXXG2D
39104-2SDF0
DNCVN5GMC3XXXF0A
DNCVN5GMC3XXXG2F
DNCVN5GMC3XXXG2G
DNCVN5GMC3XXXG2H
39100-2SDJ0
DNDVN5GMCCXXXJ1A
DNDVN5GMCCXXXJ1B
DNDVN5GMCCXXXJ1C
2022
39100-2SDL0
DNDVN5GMCCXXXL5A
DNDVN5GMCCXXXL5B
DNDVN5GMCCXXXL8A
DNDVN5GMCCXXXL8B
2022
ISG
39100-2SDK0
DNDVN5GMC3XXXJ1A
DNDVN5GMC3XXXJ1B
DNDVN5GMC3XXXJ1C
39100-2SDM0
DNDVN5GMC3XXXL5A
DNDVN5GMC3XXXL5B
DNDVN5GMC3XXXL8A
DNDVN5GMC3XXXL8B
2020
2020
ISG
2021
Sonata
(DN8A)
1262
ECU
2021
ISG
2022
2022
ISG
TSB #: 26-EM-003H
DNCVN5GMCCXXXL8A
DNCVN5GMC3XXXL8A
DNDVN5GMCCXXXL8C
DNDVN5GMC3XXXL8C
Page 15 of 16
SUBJECT:
Model
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
Current
39110-2S038
SDN8G25NB2
39110-2S040
SDN8G25NB2
2023
39110-2S279
SDN8G25NB3
SDN8G25NB4
2020
39102-2SDB0
SDN8G25NB0
SDN8G25NB1
Event
System
2021
Sonata
(DN8)
ROM ID
ECU
Part Number
MY
2022
1075
TCU
Latest
SDN8G25NB5
39104-2SDF0
SDN8G25NB0
SDN8G25NB1
SDN8G25NB2
2021
Sonata
(DN8A)
1077
39100-2SDH0
39100-2SDK0
SDN8G25NB2
SDN8G25NB3
SDN8G25NB4
2022
39100-2SDM0
TSB #: 26-EM-003H
Page 16 of 16
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TSB/Document ID: 26-EM-003H 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:
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