Hyundai service campaign 9B4
Hyundai filed this with NHTSA as a service campaign dated Aug 21, 2025, received Feb 17, 2025, about the electrical system — 5 documents under this number: 25-01-010H-1 9B4 OL, 25-01-010H-1 DN, 25-01-010H-1 TSB, 25-01-010H DN and more. It names 9 model years (2020–2024). 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 communicationCertain Elantra Hybrid (CN7 HEV), Sonata Hybrid (DN8 HEV), and Tucson Hybrid (NX4 HEV) vehicles may exhibit a warning light due to DTC Code P1BB20 (12V Lithium Battery Cell Voltage High). The California Air Resources Board has determined that these vehicles may be releasing air pollutants which exceed Federal and California standards.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 25-01-010H-1 9B4 OL | Service campaign | Aug 21, 2025 | 11022097 | not yet checked |
| 25-01-010H-1 DN | Service campaign | Jul 16, 2025 | 11020799 | not yet checked |
| 25-01-010H-1 TSB | Service campaign | Jul 16, 2025 | 11020798 | not yet checked |
| 25-01-010H DN | Service bulletin | Feb 11, 2025 | 11014286 | not yet checked |
| 25-01-010H TSB | Service campaign | Feb 11, 2025 | 11014285 | 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 Hyundai 9B4 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 9B4 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 9B4 cover?
The manufacturer filed it against 9 model years: 2023 Hyundai Elantra, 2022 Hyundai Elantra, 2021 Hyundai Elantra, 2022 Hyundai Sonata, 2021 Hyundai Sonata, 2020 Hyundai Sonata and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.