Kia bulletin SC340
Kia filed this with NHTSA as a emissions communication dated Apr 4, 2026, received Oct 24, 2025, about the engine — 20 documents under this number: SC340_TSB_R5, SC340_OWNR_NQ5_105, SC340_OWNR_JF&JFA_104, SC340_TSB_R4 and more. It names 17 model years (2016–2022). A emissions communication is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationVOLUNTARY 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.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SC340_TSB_R5 | Emissions | Apr 4, 2026 | 11031854 | not yet checked |
| SC340_OWNR_NQ5_105 | Emissions | Mar 17, 2026 | 11030391 | not yet checked |
| SC340_OWNR_JF&JFA_104 | Emissions | Mar 17, 2026 | 11030390 | not yet checked |
| SC340_TSB_R4 | Emissions | Mar 6, 2026 | 11029979 | not yet checked |
| SC340_OWNR_UM103 | Emissions | Dec 19, 2025 | 11026900 | not yet checked |
| SC340_OWNR_JF103 | Emissions | Dec 19, 2025 | 11026899 | not yet checked |
| SC340_OWNR_QL103 | Emissions | Dec 19, 2025 | 11026898 | not yet checked |
| SC340_TSB_R3 | Service bulletin | Dec 10, 2025 | 11026533 | not yet checked |
| SC340_OWNR_JF101 | Emissions | Nov 27, 2025 | 11025897 | not yet checked |
| SC340_OWNR_QL101 | Emissions | Nov 27, 2025 | 11025895 | not yet checked |
| SC340_OWNR_UM101 | Emissions | Nov 27, 2025 | 11025894 | not yet checked |
| SC340_TSB_R2 | Service bulletin | Nov 21, 2025 | 11025892 | not yet checked |
| SC340_OWNR_JF102 | Emissions | Nov 7, 2025 | 11025898 | not yet checked |
| SC340_TSB_R1 | Service bulletin | Nov 7, 2025 | 11025859 | not yet checked |
| SC340_TSB | Service bulletin | Nov 5, 2025 | 11025889 | not yet checked |
| SC340_STKR | Emissions | Oct 23, 2025 | 11024469 | not yet checked |
| SC340_QA | Emissions | Oct 23, 2025 | 11024468 | not yet checked |
| SC340_POC | Emissions | Oct 23, 2025 | 11024467 | not yet checked |
| SC340_DPSM | Emissions | Oct 23, 2025 | 11024462 | not yet checked |
| SC340_DP | Emissions | Oct 23, 2025 | 11024445 | not yet checked |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Common questions
Source: NHTSA, 49 CFR 579.5Is Kia SC340 a recall?
No. A emissions communication is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the SC340 repair free?
A emissions communication is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does SC340 cover?
The manufacturer filed it against 17 model years: 2020 Kia Optima, 2019 Kia Optima, 2018 Kia Optima, 2017 Kia Optima, 2016 Kia Optima, 2020 Kia Sorento and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.