NHTSA ID Number: 10251294
Manufacturer Communication Number: 24-FL-002H
TSB/Document Date: 2024-03-05
Summary
This bulletin provides the procedure to update the Engine Control Module (ECM) and/or the Transmission Control Module (TCM) for 2020-2023MY Sonata (DN8/DN8a) vehicles to improve operation of the Idle Stop and Go (ISG) system. Under certain circumstances the vehicle may not restart after the ISG system has engaged and requires a manual restart due to the lack of intake manifold pressure recovery.
GROUP
FUEL SYSTEM
DATE
Technical Service Bulletin
SUBJECT:
FEBRUARY 2024
NUMBER
24-FL-002H
MODEL(S)
SONATA
(DN8/DN8A)
ECU/TCU SOFTWARE UPDATE FOR ISG LOGIC IMPROVEMENT
Description: This bulletin provides the procedure to update the Engine Control Module (ECM) and/or
the Transmission Control Module (TCM) for 2020-2023MY Sonata (DN8/DN8a) vehicles to improve
operation of the Idle Stop and Go (ISG) system. Under certain circumstances the vehicle may not restart
after the ISG system has engaged and requires a manual restart due to the lack of intake manifold
pressure recovery.
Applicable Vehicles:
• 2022-2023MY Sonata (DN8) produced 6/3/2021 – 10/23/2023 (VIN starting with ‘KMH’)
• 2020-2022MY Sonata (DN8a) produced 10/23/2019 – 2/14/2022 (VIN starting with ‘5NP’)
GDS Information:
System
Event #
Description
1074
DN8 THETA3 2.5GDI ECU S/W Improvement for ISG Logic Improvement
A/T
1075
DN8 THETA3 2.5GDI TCU S/W Improvement for ISG Logic Improvement
1076
DN8a THETA3 2.5GDI ECU S/W Improvement for ISG Logic Improvement
A/T
1077
DN8a THETA3 2.5GDI TCU S/W Improvement for ISG Logic Improvement
(*or use a later available event as listed in the GDS Engine or A/T System Update screen if one is
available.)
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
SUBJECT:
ECU/TCU SOFTWARE UPDATE FOR ISG LOGIC IMPROVEMENT
Warranty Information:
Model
Op. Code
Operation
Op.
Time
20-22MY
Sonata
(DN8/DN8a)
39110FH4
ECU + TCU Software
Update
0.6
M/H
23MY Sonata
39110FH5
(DN8)
ECU Software Update
0.4
M/H
Casual Part
Nature
Code
Cause
Code
Refer to WebLTS
for applicable part
to labor op
combination
W17
ZZ3
NOTE 1: Normal warranty applies.
NOTE 2: Submit claim on Claim Entry Screen as “Warranty” type.
NOTE 3: This TSB includes Repair validation photos. Op times include VIN, Mileage, and photo
capture of the “ECU update complete” screen as outlined in the Digital Documentation Policy.
NOTE 4: If a part is found in need of replacement while performing this TSB and the affected part is
still under warranty, submit a separate claim using the same repair order. If the affected part is out of
warranty, submit a Prior Approval request for goodwill consideration prior to performing the work.
Service Procedure:
STUI
This TSB includes Repair validation photos. Refer to the latest Warranty Digital Documentation
Policy for requirements.
NOTICE
You must initially perform the GDS ECU update in Auto Mode.
• If the ECU update starts but then fails in Auto Mode, perform the update in Manual Mode
to recover.
NOTICE
GDS Vehicle Battery Low Voltage Warning:
If voltage is below 12 volts per the GDS warning, then select Back and attach a battery
maintainer/charger or run the vehicle for at least 20 minutes to ensure an adequate battery
charge for reliable update results. Turn ignition back ON, and then retry the ECU update again.
TSB #: 24-FL-002H
Page 2 of 6
SUBJECT:
SUBJECT:
1.
ECU/TCU SOFTWARE UPDATE FOR ISG LOGIC IMPROVEMENT
Perform the ECU and TCU updates in Auto
Mode.
Use the ID Check to verify the ROM ID before
updating the software.
i
Information
Refer to TSB 15-GI-001 for additional
information for the ECU update Procedure
For Tablet-Based GDS Mobile.
i
Information
2023MY Sonata (DN8) vehicles will only
require ECU update 1074.
TSB #: 24-FL-002H
Page 3 of 6
SUBJECT:
ECU/TCU SOFTWARE UPDATE FOR ISG LOGIC IMPROVEMENT
SUBJECT:
2.
STUI
Take a screenshot of the ECU update
complete screen using your tablet and
upload to STUI.
3.
After the ECU update process shows 100%
complete, cycle the ignition key to OFF for at
least 10 seconds to reset the control unit.
4.
Perform an All Systems Fault Code search
and erase DTC history that had incidentally
occurred from the ECU update.
5.
Start the vehicle in Ready mode to confirm
proper operation of the vehicle.
ROM ID Information Table: Event # 1074
Model
MY
System
ROM ID
ECU
Part Number
Old
New
39110-2S040
DNDVD5GMC3XXXJ1A
DNDVD5GMC3XXXJ1B
DNDVD5GMC3XXXJ1C
39110-2S279
DNDVD5GMC3XXXL5A
DNDVD5GMC3XXXL5B
DNDVD5GMC3XXXL8A
DNDVD5GMC3XXXL8B
39110-2S042
DNEVD5GMC3XXXM1A
DNEVD5GMC3XXXM1B
2022
DN8
ECU
2023
TSB #: 24-FL-002H
Page 4 of 6
SUBJECT:
ECU/TCU SOFTWARE UPDATE FOR ISG LOGIC IMPROVEMENT
SUBJECT:
ROM ID Information Table: Event # 1075
Model
DN8
MY
2022
System
ROM ID
TCU
Part Number
Old
39110-2S040
SDN8G25NB2
New
TCU
SDN8G25NB5
39110-2S279
SDN8G25NB3
SDN8G25NB4
ROM ID Information Table: Event # 1076
Model
MY
System
2020
DN8a
2021
ECU
Part Number
39102-2SDB0
ROM ID
Old
DNBVN5GMC3XXXDBB
DNBVN5GMC3XXXDCA
DNBVN5GMC3XXXG2F
DNBVN5GMC3XXXG2G
New
DNBVN5GMC3XXXG2H
39104-2SDF0
DNCVN5GMC3XXXF0A
DNCVN5GMC3XXXG2F
DNCVN5GMC3XXXG2G
DNCVN5GMC3XXXG2H
39100-2SDH0
DNCVN5GMC3XXXG2A
DNCVN5GMC3XXXG2B
DNCVN5GMC3XXXG2C
DNCVN5GMC3XXXG2D
39100-2SDK0
DNDVN5GMC3XXXJ1A
DNDVN5GMC3XXXJ1B
DNDVN5GMC3XXXJ1C
ECU
2022
ROM ID Information Table: Event # 1077
Model
MY
System
2020
DN8a
2021
Old
39102-2SDB0
SDN8G25NB0
SDN8G25NB1
39104-2SDF0
SDN8G25NB0
SDN8G25NB1
TCU
2022
ROM ID
TCU
Part Number
39100-2SDH0
SDN8G25NB2
39100-2SDK0
SDN8G25NB2
TSB #: 24-FL-002H
New
SDN8G25NB5
Page 5 of 6
SUBJECT:
SUBJECT:
ECU/TCU SOFTWARE UPDATE FOR ISG LOGIC IMPROVEMENT
Manual Mode Password: Event # 1074
ECM Menu
Password
DN8 2.5 GDI 8AT 22MY ISG 39110-2S040
5232
DN8 2.5 GDI 8AT 22MY ISG 39110-2S279
5233
DN8 2.5 GDI 8AT 23MY ISG 39110-2S042
5234
Manual Mode Password: Event # 1075
TCU Menu
Password
DN8 2.5 GDI 8AT ISG 39110-2S038/040/279/042
5241
Manual Mode Password: Event # 1076
ECM Menu
Password
DN8A 2.5 GDI 8AT 20MY ISG 39102-2SDB0
5251
DN8A 2.5 GDI 8AT 21MY ISG 39104-2SDF0
5252
DN8A 2.5 GDI 8AT 21MY ISG 39100-2SDH0
5253
DN8A 2.5 GDI 8AT 22MY ISG 39100-2SDK0
5254
DN8A 2.5 GDI 8AT 22MY ISG 39100-2SDM0
5255
Manual Mode Password: Event # 1077
TCU Menu
Password
DN8A 2.5 GDI 8AT ISG 39102-2SDB0/F0/H0/K0/M0
5241
TSB #: 24-FL-002H
Page 6 of 6
SUBJECT:
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TSB/Document ID: 24-FL-002H
Replacement Service Bulletin Number:
MFR Communication Date: 2024-02-29
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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