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 |
2/4 Wheel
Drive
4 Wheel Drive
Tucson
(NX4)
2022MY
ECU
Part Number
Page 14 of 18
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT &
ECM/TCU SOFTWARE UPDATE – DTC P218100, P2181F0, P2181F1
SUBJECT:
ROM ID Information: Event #1281 (Continued)
Model
Tucson
(NX4)
2023MY
Drivetrain
2/4 Wheel
Drive
2/4 Wheel
Drive
Tucson
(NX4A)
2022MY
2.5L
GDI
Engine
4 Wheel Drive
Limited
2/4 Wheel
Drive
TSB #: 26-EM-004H
ECU
Part Number
ROM ID
Current
Latest
39110-2S302
NXEVD5GMAXXXXM0A
NXEVD5GMAXXXXM1A
NXEVD5GMAXXXXM1B
NXEVD5GMAXXXXM1D
39110-2S303
NXEVD5GMCXXXXM0A
NXEVD5GMCXXXXM1A
NXEVD5GMCXXXXM1B
NXEVD5GMCXXXXM1D
39110-2S304
NXEVD5GKAXXXXM0A
NXEVD5GKAXXXXM1A
NXEVD5GKAXXXXM1B
NXEVD5GKAXXXXM1D
39110-2S307
NXEVD5GMKXXXXM0A
NXEVD5GMKXXXXM1A
NXEVD5GMKXXXXM1B
NXEVD5GMKXXXXM1D
39110-2S161
NADWN5GMFXXXXJ1A
NADWN5GMFXXXXJ1B
NADWN5GMFXXXXL8D
39110-2S162
NADWN5GMGXXXXJ1A
NADWN5GMGXXXXJ1B
NADWN5GMGXXXXL8D
39110-2S163
NADWN5GMHXXXXJ1A
NADWN5GMHXXXXJ1B
NADWN5GMHXXXXL8D
39110-2S164
NADWN5GMIXXXXJ1A
NADWN5GMIXXXXJ1B
NADWN5GMIXXXXL8D
39110-2S170
NADWN5GMKXXXXJ1A
NADWN5GMKXXXXJ1B
NADWN5GMKXXXXL8D
39110-2S165
NADWN5GSFXXXXJ1A
NADWN5GSFXXXXJ1B
NADWN5GSFXXXXL8D
39110-2S166
NADWN5GSGXXXXJ1A
NADWN5GSGXXXXJ1B
NADWN5GSGXXXXL8D
39110-2S181
NADWN5GKFXXXXJ1A
NADWN5GKFXXXXJ1B
NADWN5GKFXXXXL8D
39110-2S182
NADWN5GKGXXXXJ1A
NADWN5GKGXXXXJ1B
NADWN5GKGXXXXL8D
Page 15 of 18
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT &
ECM/TCU SOFTWARE UPDATE – DTC P218100, P2181F0, P2181F1
SUBJECT:
ROM ID Information: Event #1281 (Continued)
Model
Drivetrain
2/4 Wheel
Drive
Tucson
(NX4A)
2022MY
4-Wheel Drive
Limited
2.5L
GDI
Engine
ECU
Part Number
Current
Latest
39110-2S280
NADWN5GMFXXXXL6A
NADWN5GMFXXXXL6B
NADWN5GMFXXXXL8A
NADWN5GMFXXXXL8B
NADWN5GMFXXXXL8D
39110-2S281
NADWN5GMGXXXXL6A
NADWN5GMGXXXXL6B
NADWN5GMGXXXXL8A
NADWN5GMGXXXXL8B
NADWN5GMGXXXXL8D
39110-2S283
NADWN5GMHXXXXL6A
NADWN5GMHXXXXL6B
NADWN5GMHXXXXL8A
NADWN5GMHXXXXL8B
NADWN5GMHXXXXL8D
39110-2S285
NADWN5GMKXXXXL6A
NADWN5GMKXXXXL6B
NADWN5GMKXXXXL8A
NADWN5GMKXXXXL8B
NADWN5GMKXXXXL8D
39110-2S286
NADWN5GSFXXXXL6A
NADWN5GSFXXXXL6B
NADWN5GSFXXXXL8A
NADWN5GSFXXXXL8B
NADWN5GSFXXXXL8D
39110-2S287
NADWN5GSGXXXXL6A
NADWN5GSGXXXXL6B
NADWN5GSGXXXXL8A
NADWN5GSGXXXXL8B
NADWN5GSGXXXXL8D
39110-2S292
NADWN5GKFXXXXL6A
NADWN5GKFXXXXL6B
NADWN5GKFXXXXL8A
NADWN5GKFXXXXL8B
NADWN5GKFXXXXL8D
39110-2S293
NADWN5GKGXXXXL6A
NADWN5GKGXXXXL6B
NADWN5GKGXXXXL8A
NADWN5GKGXXXXL8B
NADWN5GKGXXXXL8D
2/4 Wheel
Drive
TSB #: 26-EM-004H
ROM ID
Page 16 of 18
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT &
ECM/TCU SOFTWARE UPDATE – DTC P218100, P2181F0, P2181F1
SUBJECT:
ROM ID Information: Event #1281 (Continued)
Model
Drivetrain
2/4 Wheel
Drive
Tucson
(NX4A)
2023MY
2.5L
GDI
Engine
4 Wheel Drive
Limited
ECU
Part Number
Current
Latest
39110-2S310
NAEVN5GMFXXXXM0A
NAEVN5GMFXXXXM1A
NAEVN5GMFXXXXM1B
NAEVN5GMFXXXXM1D
39110-2S311
NAEVN5GMGXXXXM0A
NAEVN5GMGXXXXM1A
NAEVN5GMGXXXXM1B
NAEVN5GMGXXXXM1D
39110-2S313
NAEVN5GMHXXXXM0A
NAEVN5GMHXXXXM1A
NAEVN5GMHXXXXM1B
NAEVN5GMHXXXXM1D
39110-2S315
NAEVN5GMKXXXXM0A
NAEVN5GMKXXXXM1A
NAEVN5GMKXXXXM1B
NAEVN5GMKXXXXM1D
39110-2S316
NAEVN5GKFXXXXM0A
NAEVN5GKFXXXXM1A
NAEVN5GKFXXXXM1B
NAEVN5GKFXXXXM1D
39110-2S317
NAEVN5GKGXXXXM0A
NAEVN5GKGXXXXM1A
NAEVN5GKGXXXXM1B
NAEVN5GKGXXXXM1D
2/4 Wheel
Drive
TSB #: 26-EM-004H
ROM ID
Page 17 of 18
SUBJECT:
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT &
ECM/TCU SOFTWARE UPDATE – DTC P218100, P2181F0, P2181F1
TCU ROM ID Information: Event #1032 (2022MY ONLY – TCU for VINs starting w/ “KMH”)
Model
Tucson (NX4)
2022MY
ROM ID
ECU
Part Number
Current
Latest
39110-2S105
TNX4G25X0XSC1SS2
TNX4G25X0XSC3SS4
39110-2S107
SNX4G25X0XSC1SS2
SNX4G25X0XSC3SS4
39110-2S119
TNX4G25X0XSC1SS2
TNX4G25X0XSC3SS4
39110-2S113
TNX4G25X0XSC1SS2
TNX4G25X0XSC3SS4
39110-2S116
SNX4G25X0XSC1SS2
SNX4G25X0XSC3SS4
TCU ROM ID Information: Event #1034 (2022MY ONLY – TCU for VINs starting w/ “5NM”)
Model
Tucson (NX4)
2022MY
TSB #: 26-EM-004H
ROM ID
ECU
Part Number
Current
Latest
39110-2S161
TNX4G25X0XSC1SS2
TNX4G25X0XSC3SS4
39110-2S162
TNX4G25X0XSC1SS2
TNX4G25X0XSC3SS4
39110-2S163
SNX4G25X0XSC1SS2
SNX4G25X0XSC3SS4
39110-2S170
SNX4G25X0XSC1SS2
SNX4G25X0XSC3SS4
39110-2S165
TNX4G25X0XSC1SS2
TNX4G25X0XSC3SS4
39110-2S166
TNX4G25X0XSC1SS2
TNX4G25X0XSC3SS4
39110-2S181
TNX4G25X0XSC1SS2
TNX4G25X0XSC3SS4
39110-2S182
TNX4G25X0XSC1SS2
TNX4G25X0XSC3SS4
Page 18 of 18
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