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Service bulletin SC333_TSB

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11019471
Published by NHTSA2025-06-11
Manufacturer's numberSC333_TSB
Manufacturer's date2025-06-05
Campaign id or software versionSC333
NHTSA componentENGINE; FUEL/PROPULSION SYSTEM

NHTSA's summary

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.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine, Fuel system

Trouble codes named

P0461

Vehicles listed
KIA CARNIVAL2025

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20261862026-04-10. Fuel System
26V2320002026-04-10. FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
TSB_ELE3862025-07-01. Service bulletin. TECHNICAL SERVICE BULLETIN: SERVICE ACTION: MCU DTC LOGIC IMPROVEMENT (SA617) - This bulletin provides information to upgrade the Motor Control Unit ‘MCU’ system software on certain 2025MY Carnival HEV (KA4 HEV) vehicles produced from June 27, 2024, through March 19, 2025. The affected vehicles may exhibit an intermittent Malfunction Indicator Lamp ‘MIL’ illuminated on the instrument cluster with DTC P0C7300. The DTC is caused by a software logic error within the Integrated Thermal Management Module ‘ITM’, which controls the coolant flow rate according to the coolant temperature.
SC333_QA2025-06-25. Emissions. VOLUNTARY EMISSIONS SERVICE CAMPAIGN: QUESTION AND ANSWER (SC333) - This document is the Question and Answer Guide containing the most frequently asked questions regarding the Voluntary Emissions Service Campaign SC333.
OTA_SA6172025-06-19. Over-the-air update. RELEASE NOTES: OVER-THE-AIR: SERVICE ACTION SOFTWARE UPDATE FOR ELECTRIC WATER PUMP (SA617) - This Over-the-Air (OTA) software update is designed to update the Motor Control Unit (MCU) logic of certain 2025 Carnival vehicles. This update is designed to improve the control logic of the Electric Water Pump to reduce the unintended display of warning lights.
SC333_STKR2025-06-11. Emissions. SC333_STKR: VOLUNTARY EMISSIONS SERVICE CAMPAIGN COMPLETION LABEL/STICKER
SC333_POC2025-06-11. Emissions. VOLUNTARY EMISSIONS SERVICE CAMPAIGN: SC333_POC: PROOF OF CORRECTION CARD
SC333_OWNR2025-06-11. Emissions. VOLUNTARY EMISSIONS SERVICE CAMPAIGN: OWNER NOTIFICATION (SC333) - This document is the owner notification advising that Kia is conducting a Voluntary Emissions Service Campaign to improve the emissions software logic in the Electronic Control Module (ECM) on certain 2025 MY Carnival vehicles equipped with 3.5L Gas Direct Injection (GDI) engines to ensure compliance with emissions regulations.
SC333_DPSM2025-06-11. Emissions. VOLUNTARY EMISSIONS SERVICE CAMPAIGN: DEALER PARTS AND SERVICE MANAGER MEMO (SC333) - This document is the announcement to the dealer Parts and Service managers advising that Kia is conducting a Voluntary Emissions Service Campaign on certain 2025 MY Kia Carnival vehicles equipped with 3.5L Gas Direct Injection (GDI) engines manufactured from April 15, 2024 to November 27, 2024 to improve the emissions software logic in the Electronic Control Module (ECM) to ensure compliance with emissions regulations.
SC333_DP2025-06-11. Emissions. VOLUNTARY EMISSIONS SERVICE CAMPAIGN: DEALER PRINCIPAL MEMO (SC333) - This document is the announcement to the dealer principals advising that Kia is conducting a Voluntary Emissions Service Campaign on certain 2025 MY Kia Carnival vehicles equipped with 3.5L Gas Direct Injection (GDI) engines manufactured from April 15, 2024 to November 27, 2024 to improve the emissions software logic in the Electronic Control Module (ECM) to ensure compliance with emissions regulations.