# Emissions SC340\_TSB\_R4

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Emissions
- NHTSA id: 11029979
- Published by NHTSA: 2026\-03\-13
- Manufacturer's number: SC340\_TSB\_R4
- Manufacturer's date: 2026\-03\-06
- Campaign id or software version: SC340
- NHTSA component: ELECTRICAL SYSTEM; ENGINE

## NHTSA's summary

TECHNICAL SERVICE BULLETIN: VOLUNTARY EMISSIONS SERVICE CAMPAIGN: THETA II 2.4L GDI EMISSION SECM LOGIC IMPROVEMENT \(SC340 REV 4\) \- 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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029979-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029979-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Engine

## Vehicles listed

- 2016 to 2020 KIA OPTIMA
- 2016 to 2020 KIA SORENTO
- 2017 to 2022 KIA SPORTAGE

## Recalls for the same vehicles and component

- [2023275](/recalls/tc/2023275.md), 2023-05-08: Electrical
- [2022004](/recalls/tc/2022004.md), 2022-01-11: Engine
- [2021680](/recalls/tc/2021680.md), 2021-11-05: Electrical
- [2021666](/recalls/tc/2021666.md), 2021-11-01: Engine
- [21V844000](/recalls/nhtsa/21V844000.md), 2021-10-29: ENGINE
- [2021424](/recalls/tc/2021424.md), 2021-07-09: Engine
- [2021123](/recalls/tc/2021123.md), 2021-03-08: Electrical
- [2019639](/recalls/tc/2019639.md), 2019-12-17: Engine
- [2019143](/recalls/tc/2019143.md), 2019-03-18: Engine
- [18V907000](/recalls/nhtsa/18V907000.md), 2018-12-19: ENGINE; FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS

## Other bulletins for the same vehicles and component

- [SC330\_OWNR\_301](/bulletins/11037563.md), 2026-09-30, Service campaign: EXTERIOR LIGHTING; ELECTRICAL SYSTEM. VOLUNTARY SERVICE CAMPAIGN: OWNER RENOTIFICATION \(SC330 Flight 301\) \- This document is the owner renotification advising that Kia is conducting a Voluntary Service Campaign to replace the multi\-function switch knob with improved parts on certain 2016\-2018 MY Sorento vehicles.
- [SC367\_OWNR](/bulletins/11037394.md), 2026-09-19, Emissions: ELECTRICAL SYSTEM; ENGINE. VOLUNTARY EMISSIONS SERVICE CAMPAIGN: OWNER NOTIFICATION \(SC367\) \- This document is the owner notification advising that Kia is conducting an important Voluntary Emissions Service Campaign to improve the emissions software logic in the Electronic Control Module \(ECM\) to ensure compliance with emissions regulations for 2019\-2020 MY Optima vehicles manufactured from May 21, 2018, through June 1, 2020, equipped with the 1.6L T\-GDI engine.
- [SC367\_TSB](/bulletins/11037393.md), 2026-09-19, Service bulletin: ELECTRICAL SYSTEM; ENGINE. TECHNICAL SERVICE BULLETIN: VOLUNTARY EMISSIONS SERVICE CAMPAIGN: This bulletin provides information to upgrade the Electronic Control Module ‘ECM’ system software for certain 2019\-2020 MY Optima vehicles manufactured from May 21, 2018, through June 1, 2020, equipped with the 1.6L T\-GDI engine to ensure compliance with emissions. Kia has become aware that the subject vehicles may have been produced with engine calibrations that can cause the vehicle to release air pollutants that exceed Federal and California standards. These standards were established to protect the public’s health and welfare from the dangers of air pollution.
- [SC367\_STKR](/bulletins/11037392.md), 2026-09-19, Emissions: ENGINE; ELECTRICAL SYSTEM. SC367\_STKR: VOLUNTARY EMISSIONS SERVICE CAMPAIGN COMPLETION LABEL/STICKER
- [SC367\_POC](/bulletins/11037391.md), 2026-09-19, Emissions: ENGINE; ELECTRICAL SYSTEM. SC367\_POC: PROOF OF CORRECTION CARD
- [SC367\_QA](/bulletins/11037390.md), 2026-09-19, Emissions: ELECTRICAL SYSTEM; ENGINE. VOLUNTARY EMISSIONS SERVICE CAMPAIGN: QUESTION AND ANSWER \(SC367\) – This document is the Question and Answer Guide containing the most frequently asked questions regarding Voluntary Emissions Service Campaign SC367.
- [SC367\_DPSM](/bulletins/11037389.md), 2026-09-18, Service campaign: ELECTRICAL SYSTEM; ENGINE. VOLUNTARY EMISSIONS SERVICE CAMPAIGN: DEALER PARTS AND SERVICE MANAGER MEMO \(SC367\) \- This document is the announcement to dealer Parts and Service managers advising that Kia is conducting an important Voluntary Emissions Service Campaign to improve the emissions software logic in the Electronic Control Module \(ECM\) to ensure compliance with emissions regulations for 2019\-2020 MY Optima vehicles manufactured from May 21, 2018, through June 1, 2020, equipped with the 1.6L T\-GDI engine.
- [SC367\_DP](/bulletins/11037388.md), 2026-09-18, Emissions: ENGINE; ELECTRICAL SYSTEM. VOLUNTARY EMISSIONS SERVICE CAMPAIGN: DEALER PRINCIPAL MEMO \(SC367\) \- This document is the announcement to the dealer principals advising that Kia is conducting an important Voluntary Emissions Service Campaign to improve the emissions software logic in the Electronic Control Module \(ECM\) to ensure compliance with emissions regulations for 2019\-2020 MY Optima vehicles manufactured from May 21, 2018, through June 1, 2020, equipped with the 1.6L T\-GDI engine.
- [SC365\_OWNR\_UM](/bulletins/11037387.md), 2026-09-18, Emissions: ENGINE; ELECTRICAL SYSTEM. VOLUNTARY EMISSIONS SERVICE CAMPAIGN: OWNER NOTIFICATION \(SC365\) \- This document is the owner notification advising that Kia is conducting an important Voluntary Emissions Service Campaign to improve the emissions software logic in the Electronic Control Module \(ECM\) to ensure compliance with emissions regulations on the 2019\-2020 MY Sorento vehicles manufactured from January 24, 2018 through October 26, 2020 and 2019\-2021 MY Sedona vehicles manufactured from February 13, 2018 through July 8, 2020 equipped with 3.3L GDI engines.
- [SC365\_TSB](/bulletins/11037385.md), 2026-09-18, Emissions: ELECTRICAL SYSTEM; ENGINE. TECHNICAL SERVICE BULLETIN: VOLUNTARY EMISSIONS SERVICE CAMPAIGN: This bulletin provides the procedure to update the emissions‑related logic of the Engine Control Unit \(ECU\) system software on certain 2019–2020MY Sorento \(UMa\) and 2019–2021MY Sedona \(YP\) vehicles equipped with the 3.3L GDI Lambda II engine, as listed in the table below. The subject vehicles may have been produced with engine calibrations that can cause the vehicle to release air pollutants that exceed Federal and California standards. These standards were established to protect the public’s health and welfare from the dangers of air pollution.

JSON: [/v1/bulletins/11029979](/v1/bulletins/11029979)

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