Kia bulletin SC357
What it saysVOLUNTARY EMISSIONS SERVICE CAMPAIGN: ECU EMISSIONS SOFTWARE LOGIC IMPROVEMENT (SC357) - This bulletin provides information to upgrade the Engine Control Unit (ECU) system software to improve the emissions-related logic… NHTSA’s full summary ↓
Kia filed this with NHTSA as an emissions communication dated Feb 21, 2026, received Feb 12, 2026, about the engine — 7 documents under this number: SC357_OWNR, SC357_TSB, SC357_STKR, SC357_POC and 3 more. It names 6 model years (2020–2025). An 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
TECHNICAL SERVICE BULLETIN: VOLUNTARY EMISSIONS SERVICE CAMPAIGN: ECU EMISSIONS SOFTWARE LOGIC IMPROVEMENT (SC357) - This bulletin provides information to upgrade the Engine Control Unit (ECU) system software to improve the emissions-related logic on 2020-2025MY Telluride (ON) vehicles equipped with the Lambda II 3.8L GDI engine, produced from January 9, 2019 through October 27, 2025. The subject vehicles may have engine calibrations that were not optimized for emissions standards under certain specific conditions, which may cause the vehicle to release air pollutants which exceed Federal and California standards.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SC357_OWNR | Emissions | Feb 21, 2026 | 11029044 | PDF, 184 KB |
| SC357_TSB | Service bulletin | Feb 16, 2026 | 11029138 | PDF, 823 KB |
| SC357_STKR | Emissions | Feb 12, 2026 | 11028790 | PDF, 1,189 KB |
| SC357_POC | Emissions | Feb 12, 2026 | 11028789 | PDF, 795 KB |
| SC357_QA | Emissions | Feb 12, 2026 | 11028788 | PDF, 112 KB |
| SC357_DPSM | Emissions | Feb 12, 2026 | 11028787 | PDF, 110 KB |
| SC357_DP | Emissions | Feb 12, 2026 | 11028786 | PDF, 134 KB |
What the document itself lists
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 250A63R0 | ECU Software Logic Improvement | 0.3 hrs |
Read by machine from the document NHTSA serves (7 pages), read Sep 30, 2026. A part number is shown only where it matches Kia’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote.
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.
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What owners reported
Source: NHTSA complaint databaseOwners of the 6 model years this bulletin names have filed 2,045 complaints with NHTSA since 2015. 669 of them name Engine, Electrical System — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
On the 2020 Kia Telluride, the 20 owners who gave an odometer reading for Engine reported it at a median of 78,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
021 Kia Telluride, february 13, 2021. Temperatures are single digits or below and got worse as the week went on. Started the engine and a loud squeal or whistling noise came from the top of the engine. Last about 30 seconds then slowly stops. Engine also starts to sound like it has more power once noise stops.
2021 Kia Telluride · Engine · filed with NHTSA Feb 15, 2021 · ODI 11396323
The contact owns a 2022 Kia Telluride. The contact stated that the rear backup camera would intermittently remain in operation while in the drive which caused a distraction to her while driving at various speeds. The contact also mentioned that other electrical delays would occur with the infotainment screen.
2022 Kia Telluride · Electrical System · filed with NHTSA Jan 27, 2022 · ODI 11449125
I have owned the car for 2 months. For the 3rd time while pulling out into traffic the car refused to accelerate like it was having trouble with transmission(this made it dangerous for me pulling into busy traffic) For 10 to 20 seconds it would not accelerate and then finally it would operate as normal.
2023 Kia Telluride · Engine · filed with NHTSA Feb 7, 2023 · ODI 11506042
In depth: 2025 Kia Telluride engine problems → · 2024 Kia Telluride electrical problems → · 2023 Kia Telluride electrical problems → · 2022 Kia Telluride electrical problems →
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the engine
Source: same model, same component group5 other manufacturer communications filed against the Kia Telluride under the same component group (engine), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| TSB_ENG270 | Service bulletin | Sep 25, 2026 | TECHNICAL SERVICE BULLETIN: EXCESSIVE ENGINE OIL CONSUMPTION: This bulletin provides information on diagnosing and/or repairing a 2020-2025M… |
| PS815 | Service bulletin | Sep 11, 2026 | This Pitstop provides diagnostic guidance information for technicians to replace certain components for Kia’s further analysis and investiga… |
| SA650 | Service bulletin | Jul 31, 2026 | TECHNICAL SERVICE BULLETIN: CRANKCASE EJECTOR INSPECTION/REPLACEMENT (SA650) - This bulletin provides instructions to inspect and, if necess… |
| WTY045 | Warranty extension | Jun 4, 2026 | TECHNICAL SERVICE BULLETIN: WARRANTY EXTENSION CAMPAIGN: OIL FILTER HOUSING GASKET REPLACEMENT (WTY045) - This bulletin provides information… |
| TSB_ENG247 | Service bulletin | Jul 28, 2023 | TECHNICAL SERVICE BULLETIN: DATA COLLECTION: EXTRACT CALIFORNIA EMISSIONS DATA FROM ECU (DC24) - This bulletin provides information related… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Kia, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Kia SC357 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 SC357 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 SC357 cover?
The manufacturer filed it against 6 model years: 2025 Kia Telluride, 2024 Kia Telluride, 2023 Kia Telluride, 2022 Kia Telluride, 2021 Kia Telluride, 2020 Kia Telluride. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: 2020 -2025MY Telluride (ON): built 9 Jan 2019 – 27 Oct 2025; Telluride (ON): built 8 Jan 2019 – 27 Oct 2025 — the build date is on the certification label in the driver’s door jamb.