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.
GROUP
NUMBER
ENGINE
MECHANICAL
Technical Service Bulletin
SUBJECT:
DATE
26-EM-003H
MODEL(S)
SONATA
(DN8/DN8A)
FEBRUARY 2026
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT &
ECM/TCU SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
IMPORTANT
This field action requires justification in the form of a customer concern, and a confirmed case for
the related symptom outlined in the TSB, prior to any repair work. If justification requirements are
not met, any submitted claims are subject to debit. 8 / 80,000 Emissions Warranty applies.
See Warranty Information section for more details.
Description: 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.
Applicable Vehicles:
Model Year
Model
2021 – 2023
Sonata (DN8)
2020 – 2022
Sonata (DN8A)
Engine
2.5T, 2.5L GDI
Production Dates
02/08/2021 – 10/23/2023
10/22/2019 – 02/14/2022
Parts Information:
Model
Part Name
Part Number
Sonata
(DN8)
Control Assy – Coolant
Temperature
25600-2S650QQH
Sonata
(DN8A)
Control Assy – Coolant
Temperature
25600-2S600QQH
Sonata
(DN8, DN8A)
25462-2S000
Sonata
(DN8, DN8A)
Pink Antifreeze/
Coolant
00232-19098
Figure
Quantity
1
2
NOTE: Do NOT use 100% full strength antifreeze. Prepare coolant mixed with distilled/filtered water
to refill the cooling system (35-50% antifreeze, diluted with distilled/filtered water).
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
SUBJECT:
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
SST Information:
Tool Name
Tool Number
VCI 3
G0VHNNN06
Figure
Ordering Information
Website:
https://hyundaiessentialtools.com/
Email:
[email protected]
VCI 2
Phone: 1-855-763-9199
Hours: 7 AM – 7 PM CST
G1XDDMN001
NOTE: VCI 2 (P/N G1XDDMN001) can NO longer be ordered.
GDS Information:
Model
System Event Number*
Description
1244
DN8/DN8A 2.5TGDI P2181 IMPROVEMENT
1262
DN8(a) THETA3 2.5 GDI P2181 IMPROVEMENT
1075
DN8 THETA3 2.5GDI TCU S/W Improvement for ISG Logic
Improvement
1077
DN8a THETA3 2.5GDI TCU S/W Improvement for ISG Logic
Improvement
Engine
Sonata
(DN8, DN8A)
AT
(*or use a later available event listed in the GDS Engine or AT Update screen if one is available.)
TSB #: 26-EM-003H
Page 2 of 16
SUBJECT:
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
Warranty Information:
Model
Op. Code
Operation
50D070R0
THETA III T-GDI ITM Replacement &
ECM Software Update
1.8 M/H
39110-2S037
50D070R1
THETA III GDI ITM Replacement,
ECM & TCU Software Update
(ISG Option & Certain 2020-2022MY)
2.2 M/H
39110-2S037
50D070R2
THETA III GDI ITM Replacement &
ECM Software Update
(NO ISG Option,TCM is latest software,
and 2022-2023MY)
1.9 M/H
39110-2S037
50D070R6
THETA III T-GDI ITM Replacement &
ECU Software Update
1.8 M/H
39111-2S071
50D070R7
THETA III GDI ITM Replacement,
ECM & TCU Software Update
(ISG Option & 2020-2022MY)
2.2 M/H
39111-2S071
50D070R8
THETA III GDI ITM Replacement &
ECM Software Update
(NO ISG Option,TCM is latest software,
and 2022-2023MY)
1.9 M/H
39111-2S071
Sonata (DN8)
Sonata
(DN8A)
Op. Time Causal Part
Nature
Code
Cause
Code
L31
ZZ4
NOTE 1: Submit claim on Claim Entry Screen as “Campaign” type.
NOTE 2: 8 / 80,000 Emissions Warranty applies to the part(s) and repair procedure(s) outlined in this
TSB. Prior to beginning any repair work, ensure the part(s) associated with the repair procedure are
within NVLW, observing mileage and Warranty Start Date or date of first use. If the subject part(s)
are out of warranty coverage, the dealer has the option to submit a PA Request for goodwill
consideration on a case-by-case basis.
NOTE 3: If any part(s) not subject to this TSB are found in need of replacement while performing the
repair procedure, and the affected part(s) are still under warranty, the dealer may submit a separate
claim using the same repair order. If the part(s) not subject to this TSB are out of warranty coverage,
the dealer has the option to submit a PA Request for goodwill consideration on a case-by-case basis.
NOTE 4: This TSB includes repair justification in the form of automatically uploaded DTC(s) via GDS
e-Report at the time of diagnosis. To ensure adherence to the Digital Documentation Policy before
claim submission, DTC history can be reviewed via the e-Report function within the GDS. Additionally,
required photos include a capture of the ECU Update “Success" screen for the associated update
events.
NOTE 5: The incident parts are subject to callback through the normal Warranty Technical Center
(WTC) parts return process. Claim is subject to debit if the part is not returned.
NOTE 6: For proper engine operation, ITM replacement must be completed before the ECU updates.
NOTE 7: Engine Control Module software update is required in all applications. The Transmission
Control Module software update is only required for the 2.5L GDI vehicles equipped with ISG.
TSB #: 26-EM-003H
Page 3 of 16
SUBJECT:
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
Service Procedure:
DIGITAL DOCUMENTATION
This TSB includes repair justification in the form of automatically uploaded DTC(s) via GDS eReport at the time of diagnosis. To ensure adherence to the Digital Documentation Policy
before claim submission, DTC history can be reviewed via the e-Report function within the
GDS. Additionally, required photos include a capture of the ECU Update “Success" screen for
the associated update events.
NOTICE
Applying the recommended torque to all fasteners is essential to reduce potential issues from
occurring after the service procedure.
i
Information
This TSB ONLY applies if GDS fault code searching results identify DTCs P218100, P2181F0,
and/or P2181F1.
Table of Contents
•
Flowchart: ................................................................................................................................. 5
•
DTC Check ............................................................................................................................... 6
•
ITM Replacement ..................................................................................................................... 6
•
ECM Update Procedure ........................................................................................................... 8
•
TCU Update Procedure .......................................................................................................... 11
•
ITM Coolant Filling Mode........................................................................................................ 13
TSB #: 26-EM-003H
Page 4 of 16
SUBJECT:
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
Flowchart:
Vehicle In
DTC Check
P218100, P2181F0,
P2181F1
No
Yes
ITM
Replacement
Manual ECM
Software Update
(Event #: 1244)
T-GDI
Engine Type
Auto TCU
Software Update
GDI
Yes
Manual ECM
Software Update
(Event #: 1262)
TCU Software
Verification
No
ITM Coolant
Filling Mode
Normal
Diagnostic
Process
ITM Coolant
Filling Mode
Vehicle Out
TSB #: 26-EM-003H
Page 5 of 16
SUBJECT:
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
DTC Check
1.
Use GDS to scan for DTCs P218100,
P2181F0, and P2181F1 (Cooling System
Performance):
• If DTCs are NOT detected, then this
TSB does NOT apply. Follow the
normal diagnostic process.
• If DTCs are detected, then proceed to
the ITM Replacement procedure.
ITM Replacement
2.
Replace the ITM (A) by referring to the shop
manual.
• Engine Mechanical System > Cooling
System > Integrated Thermal
Management Module (ITM) > Repair
procedures
A
3.
Reinstall parts in the reverse order of the
removal process.
i
Information
The ITM design inverts the connector’s
orientation.
TSB #: 26-EM-003H
Page 6 of 16
SUBJECT:
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
Service Procedure:
NOTICE
Initially perform the ECM update in Manual Mode and TCU update in Auto Mode
(if applicable).
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 the update from failing.
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 update.
•
Do NOT start the engine during update.
•
Do NOT turn OFF the ignition switch during update.
Manual Mode Password:
Event
1244
(T-GDI)
1262
(GDI)
TSB #: 26-EM-003H
ECM Menu
Password
DN8(a) ITM TGDI ECU 39111-2S071 (G2X)
2071
DN8(a) ITM TGDI ECU 39111-2S071 (J0A)
1702
DN8(a) ITM TGDI ECU 39111-2S076
2076
DN8(a) ITM TGDI ECU 39111-2S077
2077
DN8 THETA3 2.5 GDI ECU 39110-2S037
2037
DN8 THETA3 2.5 GDI ECU 39110-2S038
2038
DN8 THETA3 2.5 GDI ECU 39110-2S039/278
2039
DN8 THETA3 2.5 GDI ECU 39110-2S040/279
2040
DN8 THETA3 2.5 GDI ECU 39110-2S041
2041
DN8 THETA3 2.5 GDI ECU 39110-2S042
2042
DN8a THETA3 2.5 GDI ECU 39101-2SDA0
5556
DN8a THETA3 2.5 GDI ECU 39101-2SDB0
5476
DN8a THETA3 2.5 GDI ECU 39103-2SDE0/G0/H0
5253
DN8a THETA3 2.5 GDI ECU 39104-2SDF0
1873
DN8a THETA3 2.5 GDI ECU 39100-2SDJ0/L0
9710
DN8a THETA3 2.5 GDI ECU 39100-2SDK0/M0
3895
Page 7 of 16
SUBJECT:
INTEGRATED THERMAL MANAGEMENT (ITM) REPLACEMENT & ECM/TCU
SOFTWARE UPDATE – DTCS P218100, P2181F0, P2181F1
ECM Update Procedure
Information
i
Perform the ECM software update in Manual Mode based on the engine type:
•
•
1.
T-GDI: Use Event 1244.
GDI: Use Event 1262
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 ID.
NOTICE
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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:
MFR Component Subsystem:
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