WenmarOpen by Wenmar Pro

Service bulletin SC336YZ_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 id11022843
Published by NHTSA2025-09-05
Manufacturer's numberSC336YZ_TSB
Manufacturer's date2025-09-04
Campaign id or software versionSC336YZ
NHTSA componentENGINE
Manufacturer's systemSubsequent Repair Action

NHTSA's summary

This bulletin provides information related to the Technical Service Bulletin previously published under SC336 titled “Engine Inspection/Replacement and ECM Logic Improvement”.

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

Vehicles listed
KIA SELTOS2021, 2022, 2023
KIA SOUL2021, 2022, 2023

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

Recalls for the same vehicles and component
20250832025-02-18. Engine
25V0990002025-02-17. ENGINE AND ENGINE COOLING:ENGINE:HARD PARTS INTERNAL/MECHANICAL
20212252021-04-14. Engine
21V2590002021-04-13. ENGINE

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_ENG2632026-08-28. Service bulletin. TECHNICAL SERVICE BULLETIN: MISFIRE CONCERN DUE TO OVERRUNNING ALTERNATOR DECOUPLER - This bulletin provides information to address unresolved misfire events on some 2020–2024MY Forte (BDm) produced from January 1, 2019 through September 30, 2024, and 2020–2022MY Soul (SK3) vehicles produced from November 1, 2018 through May 31, 2022 equipped with a Gamma 1.6L T‑GDI engine. In certain cases, misfire symptoms may persist after completing normal diagnostic procedures and replacing ignition‑related components (spark plugs, ignition coils, and fuel injectors). If misfire concerns remain after these repairs are performed, excessive torsional oscillation of the Overrunning Alternator Decoupler (OAD) pulley may be the contributing factor. This bulletin provides the procedure to replace the OAD pulley with the updated Overrunning Alternator Pulley (OAP) kit and associated damper components.
SST082_R12025-09-05. Service bulletin. This bulletin provides instructions to perform an engine vibration inspection using the Kia Diagnostic System (KDS) tablet on certain Kia engine/model vehicles. The piston oil ring(s) in certain Kia engines may, over time, damage the surface of the engine cylinder wall. This may lead to increased oil consumption which will eventually result in abnormal noise from the engine and/or illumination of the oil pressure warning light. The applicable vehicle may or may not have the Piston Noise Sensing System (PNSS) software installed at the time of an engine vibration inspection. The PNSS software may detect engine noise triggering a DTC P132700.
TSB_SST0822025-04-23. Service bulletin. TECHNICAL SERVICE BULLETIN: PISTON NOISE SENSING SYSTEM (PNSS) INSPECTION - This bulletin provides instructions to perform an engine vibration inspection using the Kia Diagnostic System (KDS) tablet on certain 2020 - 2023 MY Kia Soul (SK3) 2021 - 2023 MY Seltos (SP2) Kia vehicles equipped with 2.0L Nu MPI Engines. The piston oil ring(s) in certain Kia engines may, over time, damage the surface of the engine cylinder wall. This may lead to increased oil consumption which will eventually result in abnormal noise from the engine and/or illumination of the oil pressure warning light. The applicable vehicle may or may not have the Piston Noise Sensing System (PNSS) software installed at the time of an engine vibration inspection. The PNSS software may detect engine noise triggering a DTC P132700.
TSB_ENG222_R82025-04-18. Service bulletin. TECHNICAL SERVICE BULLETIN: EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES - 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 on diagnosing and/or repairing some 2011-2024MY vehicles (refer to the table on pages 9 and 10 for applicable models and engine), which may exhibit a symptom of excessive oil consumption.
TSB_ENG222_R72025-03-04. Service bulletin. TECHNICAL SERVICE BULLETIN: EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES - 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 on diagnosing and/or repairing some 2011-2024MY vehicles (refer to the tables on pages 8-9 for applicable models and engine), which may exhibit a symptom of excessive oil consumption.
SC209Y_TSB_R22024-06-18. Service bulletin. TECHNICAL SERVICE BULLETIN: SUBSEQUENT REPAIR ACTION: ENGINE REPLACEMENT INSTRUCTIONS FOR PISTON RING NOISE DTC 1327 (SC209Y) - 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 related to the Technical Service Bulletin previously published in (SC209A) titled “ECM Logic Improvement for Piston Ring Noise Sensing System”. If DTC P1327 is present after the ECM Logic Improvement is performed per SC209A, follow the instructions in this bulletin to replace the engine long block.
TSB_ENG2422023-03-06. Service bulletin. TECHNICAL SERVICE BULLETIN SERVICE ACTION: COOLANT RESERVOIR CAP INSPECTION & REPLACEMENT (SA527) - This bulletin provides information to inspect and if necessary, replace the coolant reservoir cap on some 2023MY Seltos (SP2) vehicles produced from October 26, 2022 through November 11, 2022 which may have the incorrect coolant reservoir cap installed. Some vehicles may have had a metal cap installed during assembly.
TSB_ENG2412022-09-30. Service bulletin. TECHNICAL SERVICE BULLETIN: OIL LIFE MANAGEMENT SYSTEM (OLMS) AND MAINTENANCE REMINDER FEATURE - This bulletin provides information regarding the new Oil Life Management System (OLMS) Maintenance Reminder Setting feature available on some 2023MY~ and later vehicles. Kia is advising that the new OLMS maintenance reminder feature be enabled on all applicable 2023MY and later vehicles. The OLMS monitors deterioration data factors such as engine rpm, engine load, engine oil temperature and evaluates conditions such as short distance driving in cold weather, high-temperature uphill driving, and long-term idle. The 'Service Interval' (Time and Mileage) option in the Cluster settings may still be available on vehicles equipped with the new OLMS feature for customer use. During vehicle PDI, OLMS is set (100%) from the factory and not required to be reset.
TSB_ENG219_R12022-09-30. Service bulletin. TECHNICAL SERVICE BULLETIN: MAINTENANCE REMINDER FEATURE - 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 on setting the "Service Interval Reminder" feature available on most 2014-2023MY Kia vehicles (refer to model list on page 2). If the service interval reminder is set, the customer will be informed to have the next maintenance service performed, which can positively affect vehicle longevity and performance. Refer to TSB ENG241 for 2023MY~ vehicles equipped with the Oil Life Management System (OLMS) feature not included in table on page 2.
TSB_ENG227_R22022-08-03. Service bulletin. TECHNICAL SERVICE BULLETIN: SERVICE ACTION: MIL ON DTC P0605 AND/OR P2181 ECM LOGIC IMPROVEMENT (SA463) - 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 the procedure to improve the logic of the Engine Control Module (ECM) on some 2020-2021MY Soul (SK3) vehicles and 2021MY Seltos (SP2) vehicles produced in the date ranges shown below, equipped with NU 2.0L ATK engines, which may exhibit engine starting related DTC P0605 and/or thermostat related DTC P2181.