Kia bulletin SC336YZ
What it saysThis bulletin provides information related to the Technical Service Bulletin previously published under SC336 titled “Engine Inspection/Replacement and ECM Logic Improvement”. NHTSA’s full summary ↓
Kia filed this with NHTSA as a service bulletin dated Sep 4, 2025, received Sep 5, 2025, about the engine — 1 document under this number: SC336YZ_TSB. It names 6 model years (2021–2023). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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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.
This bulletin provides information related to the Technical Service Bulletin previously published under SC336 titled “Engine Inspection/Replacement and ECM Logic Improvement”.
Trouble codes it names: P1327 all 1 read from the document itself; NHTSA’s summary names none
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SC336YZ_TSB | Service bulletin | Sep 4, 2025 | 11022843 | PDF, 402 KB |
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 896 complaints with NHTSA since 2015. 630 of them name Engine — 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 2021 Kia Seltos, the 68 owners who gave an odometer reading for Engine reported it at a median of 59,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
The contact owns a 2021 Kia Seltos. The contact stated that when she took her vehicle in for an oil change, she was informed that there was no oil in the engine. The contact stated that the vehicle was leaking oil and there was a loud knocking sound coming from the engine. The contact stated no warning light was illuminated.
2021 Kia Seltos · Engine · filed with NHTSA May 18, 2021 · ODI 11417606
Shortly after purchase (8/2/23) I began noticing a persistent engine rattle between regular oil changes. This escalated to stalling issues, including on the highway and at intersections and around sharp curves. I brought the car in for service multiple times, and although a part was replaced, the symptoms soon returned.
2022 Kia Soul · Engine · filed with NHTSA Apr 9, 2025 · ODI 11653674
I believe my specific vehicle should also be assigned the recall no. 21v259000. My vehicle experienced engine stall, loss of power and leaking oil onto hit components which could have resulted in fire. I was stalled and in traffic and could also have been in hit by another vehicle.
2021 Kia Soul · Engine · filed with NHTSA Oct 10, 2022 · ODI 11488642
In depth: 2021 Kia Seltos engine problems → · 2022 Kia Soul engine problems → · 2021 Kia Soul engine 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 group11 other manufacturer communications filed against these Kia models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Kia list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| TSB_ENG263 | Service bulletin | Aug 5, 2026 | TECHNICAL SERVICE BULLETIN: MISFIRE CONCERN DUE TO OVERRUNNING ALTERNATOR DECOUPLER - This bulletin provides information to address unresolv… |
| PI2107 | Service bulletin | Apr 8, 2026 | PRODUCT IMPROVEMENT CAMPAIGN: NU 2.0L GDI - KNOCK SENSOR DETECTION SYSTEM (KSDS) ECU LOGIC IMPROVEMENT (PI2107) - This bulletin has been rev… |
| SC176Y | Service bulletin | Mar 24, 2026 | TECHNICAL SERVICE BULLETIN: SUBSEQUENT REPAIR ACTION: CATALYTIC CONVERTER REPLACEMENT AND ENGINE INSPECTION/REPLACEMENT (SC176Y) - This bull… |
| PI2002B | Service bulletin | Feb 24, 2026 | TSB - PRODUCT IMPROVEMENT CAMPAIGN (PI2002B) - NU 2.0L GDI - KNOCK SENSOR DETECTION SYSTEM (KSDS) LOGIC IMPROVEMENT - This bulletin provides… |
| DC26 | Service campaign | Feb 10, 2026 | TECHNICAL SERVICE BULLETIN: DATA COLLECTION: EXTRACT CALIFORNIA EMISSIONS DATA FROM ECU (DC26) - This bulletin has been revised to include a… |
| TSB_ENG222_R8 | Service bulletin | Apr 3, 2025 | TECHNICAL SERVICE BULLETIN: EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES - This bulletin has been revised to include additional in… |
| TSB_ENG222_R7 | Service bulletin | Feb 28, 2025 | TECHNICAL SERVICE BULLETIN: EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES - This bulletin has been revised to include additional in… |
| PI2107Y/Z | Service bulletin | Nov 8, 2024 | TECHNICAL SERVICE BULLETIN: PRODUCT IMPROVEMENT CAMPAIGN: SUBSEQUENT REPAIR ACTION: ENGINE REPLACEMENT INSTRUCTIONS FOR DTC P1326… |
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 SC336YZ a recall?
No. A service bulletin 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 SC336YZ repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every Kia warranty extension on file lists the ones Kia has filed.
Which vehicles does SC336YZ cover?
The manufacturer filed it against 6 model years: 2023 Kia Seltos, 2022 Kia Seltos, 2021 Kia Seltos, 2023 Kia Soul, 2022 Kia Soul, 2021 Kia Soul. 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: Soul (SK3): built 2 Jul 2020 – 19 Apr 2022; Seltos (SP2): built 2 Jul 2020 – 1 Jul 2022 — the build date is on the certification label in the driver’s door jamb.