Kia bulletin SC333
What it saysVOLUNTARY EMISSIONS SERVICE CAMPAIGN: ENGINE CONTROL MODULE LOGIC IMPROVEMENT (SC333) - This bulletin provides information to upgrade the ‘Engine Control Module’ (ECM) system software on certain 2025MY Carnival (KA4)… NHTSA’s full summary ↓
Kia filed this with NHTSA as an emissions communication dated Jun 11, 2025, about the fuel/propulsion system — 7 documents under this number: SC333_STKR, SC333_OWNR, SC333_TSB, SC333_POC and 3 more. It names 1 model year (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.
VOLUNTARY EMISSIONS SERVICE CAMPAIGN: ENGINE CONTROL MODULE LOGIC IMPROVEMENT (SC333) - This bulletin provides information to upgrade the ‘Engine Control Module’ (ECM) system software on certain 2025MY Carnival (KA4) vehicles equipped with 3.5L GDI Lambda Ⅲ engines produced from April 15, 2024 through November 27, 2024. The subject vehicles may have been produced with engine calibration that may cause the vehicle to release air pollutants that exceed Federal and California standards and cause the illumination of the Malfunction Indicator Lamp (MIL) with DTC P046100. These standards were established to protect the public health and welfare from the dangers of air pollutants.
Trouble codes it names: P0461 all 1 read from the document itself; NHTSA’s summary names none
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SC333_STKR | Emissions | Jun 11, 2025 | 11019470 | PDF, 412 KB |
| SC333_OWNR | Emissions | Jun 7, 2025 | 11019468 | PDF, 184 KB |
| SC333_TSB | Service bulletin | Jun 5, 2025 | 11019471 | PDF, 608 KB |
| SC333_POC | Emissions | Jun 5, 2025 | 11019469 | PDF, 208 KB |
| SC333_DPSM | Emissions | Jun 5, 2025 | 11019467 | PDF, 110 KB |
| SC333_DP | Emissions | Jun 5, 2025 | 11019466 | PDF, 134 KB |
| SC333_QA | Emissions | Jun 4, 2025 | 11019730 | not found |
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 1 model year this bulletin names have filed 197 complaints with NHTSA since 2015. 57 of them name Engine, Fuel/Propulsion 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.
Car would not accelerate past 30 or 31 MPH no matter how hard gas pedal was engaged. The RPMs increase, acknowledging the gas, but the speed stays the same. Stopping the vehicle and putting in park doesn’t fix it. This is particularly dangerous when going from city street to highway or interstate driving.
2025 Kia Carnival · Engine · filed with NHTSA Feb 21, 2025 · ODI 11644227
Vehicle lost power and would not accelerate past 30 mph even when fully pressing down on the accelerator. After a few minutes a warning flashed to check vehicle hybrid system. Pulling over to the shoulder and restarting the car returned the car to normal operation
2025 Kia Carnival · Fuel/Propulsion System · filed with NHTSA Apr 5, 2025 · ODI 11652939
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 fuel/propulsion system
Source: same model, same component group1 other manufacturer communication filed against the Kia Carnival under the same component group (fuel/propulsion system), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| TSB_FUE060_R1 | Service bulletin | May 23, 2025 | TECHNICAL SERVICE BULLETIN: CYLINDER IMBALANCE DTC P219XXOO INSPECTION AND INJECTOR REPLACEMENT - This bulletin has been revised to include… |
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 SC333 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 SC333 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 SC333 cover?
The manufacturer filed it against 1 model year: 2025 Kia Carnival. 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: 2025MY Carnival (KA4): built 15 Apr 2024 – 27 Nov 2024; Carnival (KA4): built 15 Apr 2024 – 27 Nov 2024 — the build date is on the certification label in the driver’s door jamb.