NHTSA ID Number: 11030329
Manufacturer Communication Number: 26-EM-009H TSB
TSB/Document Date: 2026-03-30
Summary
Some Sonata (DN8) and Tucson (NX4/NX4A/NX4M) vehicles equipped with the 2.5L Theta III GDI engine may display a warning lamp and store Diagnostic Trouble Code (DTC) P2B59F0, which relates to the Integrated Thermal Management Module (ITM) circuit due to a logic error. This bulletin provides instructions to update the Engine Control Module (ECM) logic to correct this condition.
GROUP
NUMBER
ENGINE
MECHANICAL
Technical Service Bulletin
SUBJECT:
DATE
26-EM-009H
MODEL(S)
MARCH 2026
SEE BELOW
ECM SOFTWARE UPDATE FOR ITM LOGIC IMPROVEMENT –
DTC P2B59F0
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) and Tucson (NX4/NX4A/NX4M) vehicles equipped with the 2.5L
Theta III GDI engine may display a warning lamp and store Diagnostic Trouble Code (DTC) P2B59F0,
which relates to the Integrated Thermal Management Module (ITM) circuit due to a logic error. This
bulletin provides instructions to update the Engine Control Module (ECM) logic to correct this condition.
•
DTC P2B59F0 – Engine Coolant Flow Control Valve Control Circuit/Open
Applicable Vehicles:
Model Year
Model
Engine
Sonata (DN8)
2024 – 2025
10/18/2023 – 06/02/2025
Tucson (NX4)
2.5L GDI
Tucson (NX4A)
2025
Production Dates
Tucson (NX4M)
01/27/2024 – 09/05/2024
06/22/2023 – 02/20/2025
06/05/2024 – 03/31/2025
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 but can be used for the updates in this TSB.
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
SUBJECT:
ECM SOFTWARE UPDATE FOR ITM LOGIC IMPROVEMENT – DTC P2B59F0
GDS Information:
Model
System
Event Number*
Description
Tucson (NX4)
1255
NX4 (PE) THETA3 2.5GDI FF DTC P2B59
IMPROVEMENT
Tucson (NX4A)
1256
NX4a (PE) THETA3 2.5GDI FF DTC P2B59
IMPROVEMENT
1257
NX4m PE THETA3 2.5GDI FF DTC P2B59
IMPROVEMENT
1270
DN8 PE THETA3 2.5GDI FF DTC P2B59
IMPROVEMENT
1294
DN8 PE THETA3 2.5T-GDI FF DTC P2B59
IMPROVEMENT
Tucson (NX4M)
ENGINE
Sonata (DN8)
(*or use a later available event listed in the GDS ENGINE Update screen if one is available.)
Warranty Information:
Model
Op. Code
Operation
Sonata
(DN8)
50D084R0
39104-2S205
Tucson
(NX4)
50D084R0
39110-2S356
Tucson
(NX4A)
50D084R1
ECM Software Update
Op. Time
Causal Part
0.3 M/H
Nature
Code
Cause
Code
I11
ZZ3
39110-2S364
Tucson
50D084R2
39104-2S440
(NX4M)
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 Emissions Warranty, observing mileage and Warranty Start Date or date of first use. If the
subject part(s) are out of warranty coverage, the retailer 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 retailer 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 retailer has the option to submit a PA Request for goodwill consideration on a case-by-case basis.
TSB #: 26-EM-009H
Page 2 of 9
SUBJECT:
ECM SOFTWARE UPDATE FOR ITM LOGIC IMPROVEMENT – DTC P2B59F0
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 event(s).
i
Information
Perform the ECM software Update in Manual Mode.
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 OR place in Ready mode during the update.
•
Do NOT turn OFF the ignition switch during the update.
TSB #: 26-EM-009H
Page 3 of 9
SUBJECT:
ECM SOFTWARE UPDATE FOR ITM LOGIC IMPROVEMENT – DTC P2B59F0
Manual Mode Password:
Event
1255
1256
1257
1270
1294
TSB #: 26-EM-009H
Menu
Password
NX4 THETA3 2.5 ECU 39110-2S356
2356
NX4 THETA3 2.5 ECU 39110-2S357
2357
NX4 THETA3 2.5 ECU 39110-2S358
2358
NX4 THETA3 2.5 ECU 39110-2S361
2361
NX4 (PE) THETA3 2.5 ECU 39104-2S403
2403
NX4 (PE) THETA3 2.5 ECU 39104-2S404
2404
NX4 (PE) THETA3 2.5 ECU 39104-2S405
2405
NX4 (PE) THETA3 2.5 ECU 39104-2S457
2457
NX4a THETA3 2.5 ECU 39110-2S364
2364
NX4a THETA3 2.5 ECU 39110-2S365
2365
NX4a THETA3 2.5 ECU 39110-2S367
2367
NX4a THETA3 2.5 ECU 39110-2S369
2369
NX4a THETA3 2.5 ECU 39110-2S370
2370
NX4a THETA3 2.5 ECU 39110-2S371
2371
NX4a (PE) THETA3 2.5 ECU 39104-2S436
2436
NX4a (PE) THETA3 2.5 ECU 39104-2S437
2437
NX4a (PE) THETA3 2.5 ECU 39104-2S438
2438
NX4a (PE) THETA3 2.5 ECU 39104-2S459
2459
NX4m PE THETA3 2.5 ECU 39104-2S440
2440
NX4m PE THETA3 2.5 ECU 39104-2S441
2441
NX4m PE THETA3 2.5 ECU 39104-2S442
2442
DN8 PE 2.5GDI ECU 39104-2S205
2205
DN8 PE 2.5GDI ECU 39104-2S206
2206
DN8 PE 2.5GDI ECU 39104-2S207
2207
DN8 PE 2.5GDI ECU 39104-2S241
2241
DN8 PE 2.5GDI ECU 39104-2S242
2242
DN8 PE 2.5GDI ECU 39104-2S243
2243
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TSB/Document ID: 26-EM-009H TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-24
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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