Kia service campaign SC335
Kia filed this with NHTSA as a service campaign dated Jun 26, 2025, received Feb 26, 2025, about the electrical system — 6 documents under this number: SC335_TSB_CLSD, SC335A_OWNR, SC335_TSB, SC335_QA and more. It names 4 model years (2023–2024). A service campaign 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.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationTECHNICAL SERVICE BULLETIN: VOLUNTARY SERVICE CAMPAIGN: BMS S/W LOGIC IMPROVEMENT FOR DTC P1BB2 (SC335) - This bulletin provides information to upgrade the Battery Management System ‘BMS’ software logic on certain 2023-2024MY Sportage HEV (NQ5 HEV) vehicles produced from February 15, 2022 to October 28, 2023, and 2023-2024MY Niro HEV (SG2 HEV) vehicles produced from June 21, 2022 through February 6, 2023. Due to a software issue, the Battery Management System (BMS) may inadvertently overcharge the 12V Lithium battery. If the 12V Lithium battery becomes overcharged, the subject vehicles may experience a reduction in motive power accompanied by the ‘Check Hybrid System, Stop Safely’ warning message, Hybrid system warning lamp, Service warning lamp, Charging system warning lamp, and a rapid beeping sound for approximately ten (10) seconds. (Note: This Voluntary Service Campaign supersedes ELE318/SA553).
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SC335_TSB_CLSD | Service bulletin | Jun 26, 2025 | 11019891 | not yet checked |
| SC335A_OWNR | Service campaign | Feb 18, 2025 | 11014553 | not yet checked |
| SC335_TSB | Service bulletin | Feb 13, 2025 | 11014552 | not yet checked |
| SC335_QA | Service campaign | Feb 13, 2025 | 11014551 | not yet checked |
| SC335_DPSM | Service campaign | Feb 13, 2025 | 11014550 | not yet checked |
| SC335_DP | Service campaign | Feb 13, 2025 | 11014549 | not yet checked |
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.
Common questions
Source: NHTSA, 49 CFR 579.5Is Kia SC335 a recall?
No. A service campaign 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 SC335 repair free?
A service campaign 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 SC335 cover?
The manufacturer filed it against 4 model years: 2024 Kia Niro, 2023 Kia Niro, 2024 Kia Sportage, 2023 Kia Sportage. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.