NHTSA ID Number: 11033838
Manufacturer Communication Number: 26-FL-002H TSB
TSB/Document Date: 2026-06-16
Summary
Some Sonata Hybrid
(DN8 HEV) vehicles may display a Check Engine light and store one or more of the DTCs listed below due to an abnormal air-fuel ratio in a specific cylinder. This bulletin provides instructions to update the Engine Control Module (ECM) to resolve the air-fuel ratio logic.
GROUP
NUMBER
FUEL SYSTEM
Technical Service Bulletin
DATE
26-FL-002H
MODEL(S)
JUNE 2026
SONATA HYBRID
(DN8 HEV)
ECM SOFTWARE UPDATE FOR AIR-FUEL RATIO
LOGIC IMPROVEMENT – DTC P219X00
SUBJECT:
IMPORTANT
This field action requires both a reported condition consistent with the symptoms outlined in this
TSB and dealer confirmation of those symptoms before any repair work is performed.
If requirements are not met, any submitted claims are subject to debit. 8 / 80,000 New Vehicle
Limited Warranty applies. See Warranty Information section for more details.
Description: Some Sonata Hybrid (DN8 HEV) vehicles may display a Check Engine light and store
one or more of the DTCs listed below due to an abnormal air-fuel ratio in a specific cylinder. This bulletin
provides instructions to update the Engine Control Module (ECM) to resolve the air-fuel ratio logic.
•
•
•
•
P219C00 – Cylinder 1 Air-Fuel Ratio Imbalance
P219D00 – Cylinder 2 Air-Fuel Ratio Imbalance
P219E00 – Cylinder 3 Air-Fuel Ratio Imbalance
P219F00 – Cylinder 4 Air-Fuel Ratio Imbalance
Applicable Vehicles:
Model Year
Model
Production Dates
2024 – 2026
Sonata Hybrid (DN8 HEV)
12/12/2023 – 11/24/2025
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 AIR-FUEL RATIO LOGIC IMPROVEMENT – DTC P219X00
GDS Information:
Model
System
Event Number*
Description
Sonata Hybrid
Engine
1362
DN8 FL HEV P219X DTC IMPROVEMENT
(DN8 HEV)
(*or use a later available event listed in the GDS Engine Update screen if one is available.)
Warranty Information:
Model
Op. Code
Operation
Op.
Time
Causal Part
Nature
Code
Cause
Code
Sonata Hybrid
ECM Software
0.3
50D320R0
39116-2J031
I11
ZZ3
(DN8 HEV)
Update
M/H
NOTE 1: Submit a “Campaign” claim on the “Claim Entry/Edit/Submit” screen on WebDCS and attach
all required Digital Documentation per TSB to the claim.
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 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.
ROM ID Information:
Model
Sonata
Hybrid
(DN8 HEV)
Event
1362
TSB #: 26-FL-002H
System
Engine
ROM ID
ECU
Part Number
Current
Latest
39116-2J031
HDN84NS0AQ0B3C00
2572HDN84NS0A1A0
39116-2J037
HDN85NS0AQ0C1C00
2572HDN85NS0A1A0
39116-2J038
2551HDN86NS0A0A0
2572HDN86NS0A1A0
Page 2 of 5
SUBJECT: ECM SOFTWARE UPDATE FOR AIR-FUEL RATIO LOGIC IMPROVEMENT – DTC P219X00
Service Procedure:
DIGITAL DOCUMENTATION
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.
NOTICE
Perform the ECM software update in Manual Mode.
NOTICE
Ensure the vehicle’s battery charge is 12.3 Volts or higher 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.
Manual Mode Password:
Event
1362
TSB #: 26-FL-002H
Menu
Password
DN8 FL HEV PCU 391162J031
1302
DN8 FL HEV PCU 391162J037
7302
DN8 FL HEV PCU 391162J038
8302
Page 3 of 5
SUBJECT: ECM SOFTWARE UPDATE FOR AIR-FUEL RATIO LOGIC IMPROVEMENT – DTC P219X00
1.
Perform the ECU 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
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. Alternatively,
disconnect the negative (–) 12V battery
terminal and wait at least 5 seconds.
Reassemble and retry the update.
3.
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.
TSB #: 26-FL-002H
Page 4 of 5
SUBJECT: ECM SOFTWARE UPDATE FOR AIR-FUEL RATIO LOGIC IMPROVEMENT – DTC P219X00
5.
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.
Place in Ready mode to confirm proper
operation of the vehicle.
8.
The service procedure is now complete.
TSB #: 26-FL-002H
Page 5 of 5
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TSB/Document ID: 26-FL-002H TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2026-06-03
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: FUEL/PROPULSION SYSTEM
MFR Component System:
MFR Component Subsystem:
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