NHTSA ID Number: 11031854
Manufacturer Communication Number: SC340_TSB_R5
TSB/Document Date: 2026-05-01
Summary
VOLUNTARY EMISSIONS SERVICE CAMPAIGN: THETA II 2.4L GDI EMISSIONS: ECM LOGIC IMPROVEMENT (SC340 REVISION 5) - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information to upgrade the Electronic Control Module ‘ECM’ system software for certain 2016-2020MY Optima, 2016-2020MY Sorento, 2017-2022MY Sportage vehicles equipped with 2.4L Theta II engines listed in the table below. Kia
has become aware that certain 2016-2022MY vehicles equipped with 2.4L Theta II engines may have engine calibrations that were not optimized for emissions standards under certain specific conditions. These calibrations may cause the vehicle to release air pollutants which exceed Federal and California standards. These standards were established to protect your health and welfare from the dangers of air pollution.
GROUP
MODEL
Voluntary Emissions
2016-2022MY
Service Campaign
Multiple Models
NUMBER
DATE
SC340 (Rev 5, 04/03/2026)
November 2025
VOLUNTARY EMISSIONS SERVICE CAMPAIGN
THETA II 2.4L GDI EMISSIONS
SUBJECT:
ECM LOGIC IMPROVEMENT (SC340)
NOTICE
This bulletin has been revised to include additional information. New/revised sections of this
bulletin are indicated by a black bar in the margin area.
This bulletin provides information to upgrade the Electronic Control Module ‘ECM’ system software for certain
2016-2022MY vehicles equipped with 2.4L Theta II engines listed in the table below. Kia has become aware that
certain 2016-2022MY vehicles equipped with 2.4L Theta II engines may have engine calibrations that were not
optimized for emissions standards under certain specific conditions. These calibrations may cause the vehicle
to release air pollutants which exceed Federal and California standards. These standards were established to
protect your health and welfare from the dangers of air pollution. Follow the procedure outlined in this
publication to update the ‘ECM’ software with improve Diagnostic Trouble Code (DTC) judgement logic. Refer
to SST081 for software upgrade instructions using Kia Diagnostic System (KDS) tablet and VCI-II/III and confirm
the Upgrade Event Number/Name, ROM ID Information, and Manual Mode passwords (if applicable) on the
applicable vehicle.
Model Year
Model
Production Date Range
16-20MY
Optima (JF, JFa)
August 28, 2015 to June 23, 2020
16-20MY
Sorento (UMa)
October 27, 2014 to November 4, 2020
17-22MY
Sportage (QL)
December 10, 2015 to December 7, 2021
NOTICE
There is no charge to the vehicle owner for this repair.
Repair status for a VIN is provided on KDealer+ (Service → Warranty Coverage → Warranty
Coverage Inquiry → Campaign Information). Not completed Recall / Service Action reports are
available on KDealer+ (Consumer Affairs → Not Completed Recall → Recall VIN → Select Report),
which includes a list of affected vehicles.
This issue number is SC340.
A printed copy is for reference only; publication information can be updated at any time.
Always refer to KGIS for the latest information. After logging in kdealer.com, the newest technical
publications are listed in ‘Service Releases’ and has the latest service information that has been released.
Page 2 of 28
THETA II 2.4L GDI EMISSIONS ECM LOGIC IMPROVEMENT (SC340)
SUBJECT:
Refer to TSB SST081 for instructions to upgrade the ‘ECM’ system:
To correct this condition, the specified system module should be reprogrammed using KDS
as described in this bulletin in ‘Auto Mode’.
Upgrade Event Name
876.UMa PE Theta 2.4 Emission Logic Improvement (19MY)
877.UMa PE Theta 2.4 Emission Logic Improvement (20MY)
878.JFa PE Theta 2.4 Emission Logic Improvement (19~20MY)
879.QL/QL PE Theta 2.4 Emission Logic Improvement (19~21MY)
889.UMa Theta 2.4 Emission Logic improvement (18MY)
890.JF/JFa Theta 2.4 Emission Logic improvement (18MY)
891.QL Theta 2.4 Emission Logic improvement (18MY)
914.QL PE Theta 2.4 Emission Logic Improvement (22MY)
925. QL Theta 2.4 Emission Logic Improvement (17MY)
932.UMa Theta 2.4 Emission Logic Improvement (16~17MY)
959.JF/JFa Theta 2.4 Emission Logic Improvement (16~17MY)
NOTICE
•
Confirm a fully charged battery (12.3 volts or higher is necessary) is used or utilize or fully charged jump
starter box connected to the battery.
•
Ensure the KDS GDS is sufficiently charged at 60% or higher to reflash.
•
All ECU upgrades must be performed with the ignition set to the ‘ON’ position unless otherwise stated.
•
Damaged VCI II/III units should not be used and promptly replaced.
•
Be careful not to disconnect the VCI-II /III connected to the vehicle during the ECU upgrade procedure.
•
DO NOT start the engine during ECU upgrade.
•
DO NOT turn the ignition key ‘OFF’ or interrupt the power supply during ECU upgrade.
•
When the ECU upgrade is completed, turn the ignition ‘OFF’ and wait 10 seconds before starting the
engine.
•
ONLY use approved ECU upgrade software designated for the correct application.
Connect the negative (-) terminal to the battery as shown below.
NOTICE
Before attempting an ECU upgrade on any Kia model, make sure to first determine whether the applicable
model is equipped with an immobilizer
security system. Failure to follow proper procedures may cause
the PCM to become inoperative after the upgrade and any claims associated with this repair may be subject
to chargeback.
Printed document copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.
TSB: SC340 (Rev 5) Multiple Models November 2025
Page 3 of 28
SUBJECT:
THETA II 2.4L GDI EMISSIONS ECM LOGIC IMPROVEMENT (SC340)
ROM ID Information Table:
Upgrade Event #877 Sorento (UMa)
Model
System
IMMO
ECU P/No.
ROM ID
Previous
New
UPAKNC4ERG1A
UPAKNC4ERG1B
Yes
39171 2GMN2
39171 2GMN3
UPAKNC4ERG3A
UPAKNC4ERG3B
UPAKNC4ERGXA
UPAKNC4ERG3C
UPAKNC4ERG3D
Sorento
(UMa)
20MY
UPAKNC4ERG3E
ECM
(ULEV)
UPAKNC4EMG1A
UPAKNC4EMG1B
No
39173 2GMA2
39173 2GMA3
UPAKNC4EMG3A
UPAKNC4EMG3B
UPAKNC4EMGXA
UPAKNC4EMG3C
UPAKNC4EMG3D
UPAKNC4EMG3E
Continued…
Printed document copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.
TSB: SC340 (Rev 5) Multiple Models November 2025
Page 4 of 28
SUBJECT:
THETA II 2.4L GDI EMISSIONS ECM LOGIC IMPROVEMENT (SC340)
Upgrade Event #878 Optima (JFa)
Model
System
IMMO
ECU P/No.
ROM ID
Previous
New
JPAJNC4ERE3A
JPAJNC4ERE3B
JPAJNC4ERE3C
JPAJNC4ERE6D
Yes
39171 2GJK0
JPAJNC4ERE6E
JPAJNC4ERE6F
JPAJNC4ERGXA
JPAJNC4ERG1G
JPAJNC4ERG1H
JPAJNC4ERG1I
JPAJNC4ERG1J
ECM
(ULEV)
JPAJNC4EME3A
JPAJNC4EME3B
JPAJNC4EME3C
JPAJNC4EME6D
No
39171 2GJK5
JPAJNC4EME6E
JPAJNC4EME6F
JPAJNC4EMGXA
JPAJNC4EMG1G
JPAJNC4EMG1H
Optima
JPAJNC4EMG1I
(JFa)
JPAJNC4EMG1J
19MY
JPAJNS4ERE3A
JPAJNS4ERE3B
JPAJNS4ERE3C
JPAJNS4ERE6D
Yes
39171 2GJL0
JPAJNS4ERE6E
JPAJNS4ERGXA
JPAJNS4ERG1F
JPAJNS4ERG1G
JPAJNS4ERG1H
JPAJNS4ERG1I
ECM
(SULEV)
JPAJNS4EME3A
JPAJNS4EME3B
JPAJNS4EME3C
JPAJNS4EME6D
No
39171 2GJL5
JPAJNS4EME6E
JPAJNS4EMG1F
JPAJNS4EMG1G
JPAJNS4EMG1H
JPAJNS4EMG1I
Continued…
Printed document copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.
TSB: SC340 (Rev 5) Multiple Models November 2025
JPAJNS4EMGXA
Page 5 of 28
SUBJECT:
THETA II 2.4L GDI EMISSIONS ECM LOGIC IMPROVEMENT (SC340)
Upgrade Event #878 Optima (JFa)
Model
System
IMMO
ECU P/No.
ROM ID
Previous
New
JPAKNC4ERG11
JPAKNC4ERG1A
JPAKNC4ERG1B
Yes
39171 2GJK1
JPAKNC4ERG1C
JPAKNC4ERGXA
JPAKNC4ERG3A
JPAKNC4ERG3B
JPAKNC4ERG3C
ECM
(ULEV)
JPAKNC4EMG11
JPAKNC4EMG1A
JPAKNC4EMG1B
No
39171 2GJK6
JPAKNC4EMG1C
JPAKNC4EMGXA
JPAKNC4EMG3A
JPAKNC4EMG3B
JPAKNC4EMG3C
Optima
(JFa)
20MY
JPAKNS4ERG11
JPAKNS4ERG1A
JPAKNS4ERG1B
Yes
39171 2GJL1
JPAKNS4ERG1C
JPAKNS4ERGXA
JPAKNS4ERG3A
JPAKNS4ERG3B
JPAKNS4ERG3C
ECM
(SULEV)
JPAKNS4EMG11
JPAKNS4EMG1A
JPAKNS4EMG1B
No
39171 2GJL6
JPAKNS4EMG1C
JPAKNS4EMGXA
JPAKNS4EMG3A
JPAKNS4EMG3B
JPAKNS4EMG3C
Continued…
Printed document copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.
TSB: SC340 (Rev 5) Multiple Models November 2025
Page 6 of 28
SUBJECT:
THETA II 2.4L GDI EMISSIONS ECM LOGIC IMPROVEMENT (SC340)
Upgrade Event #879 Sportage (QL)
Model
System
IMMO
ECU P/No.
ROM ID
Previous
New
QLDJNC4ERE2A
QLDJNC4ERG1B
39100 2GHR7
QLDJNC4ERG1C
QLDJNC4ERGXA
QLDJNC4ERG1D
QLDJNC4ERG1E
Yes
QLDJNC4ERE2K
QLDJNC4ERG1L
39100 2GHS7
QLDJNC4ERG1M
QLDJNC4ERGXB
QLDJNC4ERG1N
ECM
QLDJNC4ERG1O
(ULEV)
QLDJNC4EME2A
QLDJNC4EMG1B
39100 2GHS2
QLDJNC4EMG1C
QLDJNC4EMGXA
QLDJNC4EMG1D
QLDJNC4EMG1E
No
QLDJNC4EME2K
QLDJNC4EMG1L
39100 2GHT2
QLDJNC4EMG1M
QLDJNC4EMGXB
QLDJNC4EMG1N
Sportage
QLDJNC4EMG1O
(QL)
QLDJNS4ERE2A
19MY
QLDJNS4ERG1B
39100 2GHT7
QLDJNS4ERG1C
QLDJNS4ERGXA
QLDJNS4ERG1D
QLDJNS4ERG1E
Yes
QLDJNS4ERE2K
QLDJNS4ERG1L
39100 2GHV7
QLDJNS4ERG1M
QLDJNS4ERGXB
QLDJNS4ERG1N
QLDJNS4ERG1O
ECM
(SULEV)
QLDJNS4EME2A
QLDJNS4EMG1B
39100 2GHV2
QLDJNS4EMG1C
QLDJNS4EMGXA
QLDJNS4EMG1D
QLDJNS4EMG1E
No
QLDJNS4EME2K
QLDJNS4EMG1L
39100 2GHW2
QLDJNS4EMG1M
QLDJNS4EMG1N
QLDJNS4EMG1O
Continued…
Printed document copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.
TSB: SC340 (Rev 5) Multiple Models November 2025
QLDJNS4EMGXB
Page 7 of 28
SUBJECT:
THETA II 2.4L GDI EMISSIONS ECM LOGIC IMPROVEMENT (SC340)
Upgrade Event #879 Sportage (QL)
Model
System
IMMO
ECU P/No.
ROM ID
Previous
New
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TSB/Document ID: SC340_TSB_R5
Replacement Service Bulletin Number:
MFR Communication Date: 2026-04-04
MFR Internal Campaign ID/Software Version: SC340
Communication Type: Emissions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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