Kia bulletin SC325
What it saysVOLUNTARY EMISSIONS SERVICE CAMPAIGN: AEWP INSPECTION AND REPLACEMENT (SC325) - This bulletin has been revised to include additional information. NHTSA’s full summary ↓
Kia filed this with NHTSA as an emissions communication dated Feb 20, 2026, received Feb 5, 2025, about the engine — 10 documents under this number: SC325_TSB_R1, SC325_TSB, SC325_STKR, SC325_POC and 6 more. It names 5 model years (2022–2023). 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: AEWP INSPECTION AND REPLACEMENT (SC325) - 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 to inspect and, if necessary, replace the Auxiliary Electric Water Pump (AEWP), control harness wiring, and/or engine room junction box for coolant intrusion and/or corrosion on certain 2022-2023MY Kia Hybrid and Plug-in Hybrid vehicles listed in the table below. The AEWP in the subject vehicles may crack internally and allow coolant to intrude into the AEWP circuitry. If coolant enters the AEWP circuitry, the Check Engine Light (CEL) may be illuminated with one or more DTCs listed on page 2. If the vehicle continues to be driven in this condition, the Active Air Flap (AAF) warning message can also activate, and coolant may eventually migrate through the wiring harness to the engine room junction block. This may result in a reduction of motive power and may cause the vehicle to release air pollutants which exceeds Federal and California standards. These standards were established to protect the public health and welfare from the dangers of air pollution.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SC325_TSB_R1 | Service bulletin | Feb 20, 2026 | 11029043 | PDF, 1,063 KB |
| SC325_TSB | Service bulletin | Feb 7, 2025 | 11014236 | PDF, 935 KB |
| SC325_STKR | Emissions | Feb 6, 2025 | 11013791 | PDF, 274 KB |
| SC325_POC | Emissions | Feb 6, 2025 | 11013786 | PDF, 152 KB |
| SC325_OWNR_SG2 | Emissions | Feb 6, 2025 | 11013785 | PDF, 186 KB |
| SC325_OWNR_NQ5 | Emissions | Feb 6, 2025 | 11013780 | PDF, 186 KB |
| SC325_OWNR_MQ4 | Emissions | Feb 6, 2025 | 11013779 | PDF, 186 KB |
| SC325_QA | Emissions | Feb 4, 2025 | 11013789 | PDF, 113 KB |
| SC325_DPSM | Emissions | Feb 4, 2025 | 11013772 | PDF, 113 KB |
| SC325_DP | Emissions | Feb 4, 2025 | 11013770 | PDF, 137 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 5 model years this bulletin names have filed 846 complaints with NHTSA since 2015. 416 of them name Electrical System, 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 2023 Kia Sportage, the 12 owners who gave an odometer reading for Engine reported it at a median of 47,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
Problem 1, Check Engine Light: I purchased the used car on Jan 9 2025, around 23,400 miles from Kia Dealership, capitol Expy in San Jose. Today 05/27/2026, the odometer reads 26, 407 miles. My car is used only twice a week - 20 miles on Fridays, 12 miles on Wednesdays. My car has less than minimum wear and tear and is barely used.
2022 Kia Niro · Engine · filed with NHTSA May 27, 2026 · ODI 11740374
I am experiencing the same issues as the individual who documented incident #11685147. When I turn the shifter to drive and let my foot off the brake, with auto-hold on, the will still roll backwards, even on flat ground, and not respond to me pushing the gas pedal. I have to put the vehicle back into park, and try again.
2023 Kia Niro · Engine · filed with NHTSA Nov 5, 2025 · ODI 11697775
Critical Issue: Gasoline leaks into engine. That causes increasing engine oil level significantly and mixed with engine oil. I dropped off me car (mileage: 11731) at Kia Pro in Glendale, CA on 5/1/2025 as soon as I confirmed that engine oil level exceeds the maximum (twice of max) and smelled Gasoline from the dipstick.
2023 Kia Sorento · Engine · filed with NHTSA May 2, 2025 · ODI 11658457
In depth: 2022 Kia Sorento engine problems → · 2023 Kia Sportage electrical problems → · 2023 Kia Sportage 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 group25 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 |
|---|---|---|---|
| SC365 | Emissions | Sep 10, 2026 | TECHNICAL SERVICE BULLETIN: VOLUNTARY EMISSIONS SERVICE CAMPAIGN: This bulletin provides the procedure to update the emissions‑related logic… |
| SC340 | Emissions | Apr 4, 2026 | VOLUNTARY EMISSIONS SERVICE CAMPAIGN: THETA II 2.4L GDI EMISSIONS: ECM LOGIC IMPROVEMENT (SC340 REVISION 5) - This bulletin has been revised… |
| CA2516 | Service bulletin | Apr 1, 2026 | TECHNICAL SERVICE BULLETIN: CUSTOMER ACTION: ECU LOGIC IMPROVEMENT FOR DTC P2B59F0 (CA2516) - This bulletin provides information to upgrade… |
| WTY026_QA | Service bulletin | Mar 18, 2026 | TECHNICAL SERVICE BULLETIN: OIL PRESSURE SWITCH (OPS) REPLACEMENT - This bulletin has been revised to include additional information. New/re… |
| 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… |
| CA2508 | Service bulletin | Dec 8, 2025 | TECHNICAL SERVICE BULLETIN: ITM REPLACEMENT AND ECM & TCM LOGIC IMPROVEMENT (CA2508) - This bulletin provides information to replace the Int… |
| SC320 | Emissions | Nov 20, 2025 | TECHNICAL SERVICE BULLETIN: VOLUNTARY EMISSIONS SERVICE CAMPAIGN: EGR VALVE ASSEMBLY REPLACEMENT (SC320) - This bulletin has been revised to… |
| SC353 | Service campaign | Nov 13, 2025 | TECHNICAL SERVICE BULLETIN: VOLUNTARY SERVICE CAMPAIGN: ENGINE REPLACEMENT FOR COOLANT LEAK (SC353) - This bulletin provides information to… |
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 SC325 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 SC325 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 SC325 cover?
The manufacturer filed it against 5 model years: 2023 Kia Niro, 2022 Kia Niro, 2023 Kia Sorento, 2022 Kia Sorento, 2023 Kia Sportage. 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: 2022-2023 Sorento HEV, PHEV (MQ4 P/HEV): built 2 Mar 2022 – 27 Dec 2022; 2023 Sportage HEV, PHEV (NQ5 P/HEV): built 2 Mar 2022 – 4 Jan 2023; 2023 Niro HEV, PHEV (SG2 P/HEV) Kappa: built 21 Jun 2022 – 26 Apr 2023 — the build date is on the certification label in the driver’s door jamb.