NHTSA ID Number: 11029939
Manufacturer Communication Number: 26-01-013H-1 TSB
TSB/Document Date: 2026-03-11
Summary
Certain Santa Fe (TMA), Santa Fe Sport (AN), Sonata (LFA), and Tucson (TL) vehicles equipped with Theta II engines may exhibit elevated engine-out emissions. This bulletin provides instructions for updating the Engine Control Module (ECM) to address this condition.
GROUP
NUMBER
CAMPAIGN
Technical Service Bulletin
SUBJECT:
26-01-013H-1
DATE
MODEL(S)
MARCH 2026
SEE BELOW
ECU SOFTWARE UPDATE FOR THETA II EMISSIONS
IMPROVEMENT (SERVICE CAMPAIGN 9C2)
This TSB supersedes 26-01-013H to add 2015MY Sonata (LFA) vehicles, along with a new
software event (1383) and associated GDS, Warranty, ROM ID, and Manual Mode Password
information.
IMPORTANT
Dealers must perform this service campaign on all affected vehicles prior to customer retail delivery
and whenever an affected vehicle is in the shop for any maintenance or repair.
Access the “Vehicle Information” screen via WebDCS to identify open campaigns.
Description: Certain Santa Fe (TMA), Santa Fe Sport (AN), Sonata (LFA), and Tucson (TL) vehicles
equipped with Theta II engines may exhibit elevated engine-out emissions. This bulletin provides
instructions for updating the Engine Control Module (ECM) to address this condition.
Applicable Vehicles (Certain):
Model Year
Model
2019 - 2020
Santa Fe (TMA)
2017 - 2018
2015 - 2019
2018 - 2021
Santa Fe Sport (AN)
Sonata (LFA)
Tucson (TL)
Engine
Production Dates
05/23/2018 - 08/23/2021
2.4L GDI Theta II
06/20/2016 - 04/19/2018
05/01/2014 – 09/30/2019
01/30/2018 - 02/04/2021
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
SUBJECT: ECU SOFTWARE UPDATE FOR THETA II EMISSIONS IMPROVEMENT (SERVICE CAMPAIGN 9C2)
Parts Information:
Model
Part Name
Part Number
Figure
Remarks
9C2
Santa Fe
Emissions Label
(TMA),
Santa Fe
Sport (AN),
Sonata
(LFA),
&
Vehicle Emission
Tucson
Recall - Proof of
(TL)
Correction Card
NP001-SC9C2
NP001-SC9C2
Apply to all
vehicles
regardless of
state
Order only for
states:
CA, CO, CT,
DE, ME, MD,
MA, NJ, NY,
OR, PA, RI,
VT, WA
NP050-09006
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.
TSB #: 26-01-013H-1
Page 2 of 21
SUBJECT: ECU SOFTWARE UPDATE FOR THETA II EMISSIONS IMPROVEMENT (SERVICE CAMPAIGN 9C2)
GDS Information:
Event
Number*
Description
1329
LFa PE ECU UPGRADE - EMISSION LOGIC IMPROVEMENT
1330
LFa ECU UPGRADE - EMISSION LOGIC IMPROVEMENT (18MY)
1367
LFa ECU UPGRADE - EMISSION LOGIC IMPROVEMENT (17MY)
1372
LFa ECU UPGRADE - EMISSION LOGIC IMPROVEMENT (16MY)
1383
LFa ECU UPGRADE - EMISSION LOGIC IMPROVEMENT (15MY)
Santa Fe
(TMA)
1267
TMa ECU UPGRADE - EMISSION LOGIC IMPROVEMENT
Santa Fe
Sport
(AN)
1373
DMa(AN) PE ECU UPGRADE - EMISSION LOGIC IMPROVEMENT
(17~18MY)
1269
TL PE ECU UPGRADE - EMISSION LOGIC IMPROVEMENT
1331
TL ECU UPGRADE - EMISSION LOGIC IMPROVEMENT (18MY)
Model
System
Sonata
(LFA)
Tucson
(TL)
(*or use a later available event listed in the GDS Engine Update screen if one is available.)
TSB #: 26-01-013H-1
Page 3 of 21
SUBJECT: ECU SOFTWARE UPDATE FOR THETA II EMISSIONS IMPROVEMENT (SERVICE CAMPAIGN 9C2)
Warranty Information:
Model
Op. Code
Sonata
(LFA)
50D115R0
Santa Fe
Sport (AN)
50D115R1
Santa Fe
(TMA)
50D115R2
Tucson
(TL)
50D115R3
Sonata (LFA),
Santa Fe (TMA),
& Tucson (TL)
w/BOTH
50D115R8
Campaigns
953 & 9C2
Open
Operation
Op.
Time
Causal Part
Nature
Code
Cause
Code
M73
ZZ3
28510-2GAV0
Theta II ECU
Software Update +
Emissions Label
Application
0.4
M/H
28510-2G455
28510-2GBB0
28510-2EMN0
Administrative +
Emissions Label
Application:
Refer to NOTE 4
Below
28510-2GAV0
(LFA)
0.2
M/H
28510-2GBB0
(TMA)
28510-2EMN0
(TL)
Santa Fe Sport
Administrative +
(AN)
Emissions Label
w/BOTH
0.2
50D115R9
Application:
28510-2G455
Campaigns
M/H
Refer to NOTE 4
953 & 9C2
Below
Open
NOTE 1: Submit claim on Claim Entry Screen as “Campaign” type.
NOTE 2: 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 3: This TSB includes repair validation photos. Op times include VIN, mileage, and photo
capture of the ECU Update “Success” screen as outlined in the Digital Documentation Policy.
NOTE 4: If both campaigns 953 and 9C2 are open on a vehicle, submit a claim with the applicable
operation code referencing the latest TSB for Service Campaign 953. Then, submit a second claim
for Service Campaign 9C2 using operation code 50D115R8 or 50D115R9 for the applicable model.
TSB #: 26-01-013H-1
Page 4 of 21
SUBJECT: ECU SOFTWARE UPDATE FOR THETA II EMISSIONS IMPROVEMENT (SERVICE CAMPAIGN 9C2)
Service Procedure:
DIGITAL DOCUMENTATION
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
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.
Table of Contents
•
ECU Update Procedure ..................................................................................................................... 6
•
Emissions Label Application (for All Vehicles) ................................................................................. 10
•
Vehicle Emission Recall – Proof of Correction Card (for Vehicles Registered in Certain States) .... 11
TSB #: 26-01-013H-1
Page 5 of 21
SUBJECT: ECU SOFTWARE UPDATE FOR THETA II EMISSIONS IMPROVEMENT (SERVICE CAMPAIGN 9C2)
ECU Update Procedure
1.
Perform the ECU update in Auto 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 indoor fuse box for at
least 5 seconds, then reconnect it.
Alternatively, disconnect the negative (–)
12V battery terminal, wait at least 5
seconds, then reconnect it. 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 #: 26-01-013H-1
Page 6 of 21
SUBJECT: ECU SOFTWARE UPDATE FOR THETA II EMISSIONS IMPROVEMENT (SERVICE CAMPAIGN 9C2)
4.
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.
5.
Perform an All Systems Fault Code search
and erase DTC history that had incidentally
occurred from the ECU update.
6.
Disconnect the power connector of the indoor
fuse box, wait at least 5 seconds, then
reconnect it.
i
Information
Alternatively, disconnect the negative (–)
12V battery terminal, wait at least 5
seconds, then reconnect it.
TSB #: 26-01-013H-1
Page 7 of 21
SUBJECT: ECU SOFTWARE UPDATE FOR THETA II EMISSIONS IMPROVEMENT (SERVICE CAMPAIGN 9C2)
7.
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TSB/Document ID: 26-01-013H-1 TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-04
MFR Internal Campaign ID/Software Version: 9C2
Communication Type: Service Campaign
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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