NHTSA ID Number: 11029942
Manufacturer Communication Number: 26-EM-006H TSB
TSB/Document Date: 2026-03-11
Summary
Some Elantra (CN7) vehicles equipped with the 2.0L AKS NU PE engine may exhibit an illuminated Check Engine light for diagnostic trouble code (DTC) P218100 or P013300 which are related to the Integrated Thermal Management Module (ITM) and Oxygen Sensor monitoring. This bulletin provides instructions to update the Engine Control Module (ECM) logic to resolve the condition.
GROUP
NUMBER
ENGINE
MECHANICAL
Technical Service Bulletin
SUBJECT:
DATE
26-EM-006H
MODEL(S)
MARCH 2026
ELANTRA (CN7)
ECU SOFTWARE UPDATE FOR ITM LOGIC & OXYGEN
SENSOR IMPROVEMENT – DTC P218100 / P013300
Description: Some Elantra (CN7) vehicles equipped with the 2.0L AKS NU PE engine may exhibit an
illuminated Check Engine light for diagnostic trouble code (DTC) P218100 or P013300 which are
related to the Integrated Thermal Management Module (ITM) and Oxygen Sensor monitoring. This
bulletin provides instructions to update the Engine Control Module (ECM) logic to resolve the condition.
•
DTC P218100 – Cooling System Performance
•
DTC P013300 – O2 Sensor Circuit Slow Response (Bank 1 / Sensor 1)
Applicable Vehicles:
Model Year
Model
2024 – 2025
Elantra (CN7)
2.0L AKS NU PE
Figure
Ordering Information
SST Information:
Tool Name
Tool Number
VCI 3
G0VHNNN06
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
ECU SOFTWARE UPDATE FOR ITM LOGIC &
OXYGEN SENSOR IMPROVEMENT – DTC P218100 / P013300
SUBJECT:
GDS Information:
Model
System
Event
Number*
Description
Elantra
CN7 PE ECU UPGRADE FOR EARLY INTERVENTION OF
Engine
1277
(CN7)
ITM ISSUES
(*or use a later available event listed in the GDS Engine update screen if one is available.)
Warranty Information:
Model
Elantra
(CN7)
Op. Code
Operation
Op.
Time
Causal Part
Nature
Code
Cause
Code
39100F48
ECU Update for ITM
Logic and Oxygen
Sensor Improvement
0.4
M/H
Refer to WebLTS for
applicable part to
labor op code
combination
I11
ZZ3
NOTE 1: Normal warranty applies.
NOTE 2: Submit claim on Claim Entry Screen as “Warranty” type.
NOTE 3: 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 4: 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.
ROM ID Information:
Model
Event
System
2024MY
Elantra
(CN7)
1277
2025MY
Elantra
(CN7)
TSB #: 26-EM-006H
Engine
ROM ID
ECU
Part Number
Current
Latest
39100-2J340
CNEVD0AMF3XCSPGA
CNEVD0AMF3XCFPGB
39100-2J341
CNEVD0AMFCXCSPGA
CNEVD0AMFCXCFPGB
39100-2J342
CNEVD0ANF3XCSPGA
CNEVD0ANF3XCFPGB
391X2-2J355
391X2-2J356
CNGVD0AMFCXCSPJA
CNGVD0AMFCXCSPJB
CNGVD0ANF3XCSPJA
CNGVD0ANF3XCSPJB
CNGVD0AMFCXCSPJC
CNGVD0ANF3XCSPJC
Page 2 of 6
SUBJECT:
ECU SOFTWARE UPDATE FOR ITM LOGIC &
OXYGEN SENSOR IMPROVEMENT – DTC P218100 / P013300
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 event(s).
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-006H
Page 3 of 6
ECU SOFTWARE UPDATE FOR ITM LOGIC &
OXYGEN SENSOR IMPROVEMENT – DTC P218100 / P013300
SUBJECT:
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 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-EM-006H
Page 4 of 6
ECU SOFTWARE UPDATE FOR ITM LOGIC &
OXYGEN SENSOR IMPROVEMENT – DTC P218100 / P013300
SUBJECT:
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.
Remove the power connector from the
in-cabin fuse box for 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-EM-006H
Page 5 of 6
SUBJECT:
ECU SOFTWARE UPDATE FOR ITM LOGIC &
OXYGEN SENSOR IMPROVEMENT – DTC P218100 / P013300
7.
Start the engine to confirm proper operation of
the vehicle.
8.
The service procedure is now complete.
NOTICE
If the ECU update fails in Auto Mode, perform the update in Manual Mode using the password(s)
below.
Manual Mode Password:
Event
1277
TSB #: 26-EM-006H
Menu
Password
CN7 PE 2.0 ATK ECU 39100-2J340
2340
CN7 PE 2.0 ATK ECU 39100-2J341
2341
CN7 PE 2.0 ATK ECU 39100-2J342
2342
CN7 PE 2.0 ATK ECU 391X2-2J355
2355
CN7 PE 2.0 ATK ECU 391X2-2J356
2356
Page 6 of 6
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TSB/Document ID: 26-EM-006H TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-06
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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