Zero bulletin MBB-44 / BMU-19
Zero filed this with NHTSA as a over-the-air update dated Feb 2, 2026, received Mar 18, 2026, about the fuel/propulsion system — 1 document under this number: ZMDN-022026. It names 24 model years (2020–2025). A over-the-air update 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 communicationDealer notification announcing new firmware for certain models of Zero Motorcycles.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| ZMDN-022026 | Over-the-air update | Feb 2, 2026 | 11030156 | 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 themAlso filed against: 2024 Zero DS; 2025 Zero DS; 2024 Zero DSR; 2025 Zero DSR; 2023 Zero Dsr/x; 2024 Zero Dsr/x; 2025 Zero Dsr/x; 2024 Zero S; 2025 Zero S; 2022 Zero SR; 2023 Zero SR; 2024 Zero SR; 2020 Zero Sr/f; 2021 Zero Sr/f; 2022 Zero Sr/f; 2023 Zero Sr/f; 2024 Zero Sr/f; 2025 Zero Sr/f; 2020 Zero Sr/s; 2021 Zero Sr/s; 2022 Zero Sr/s; 2023 Zero Sr/s; 2024 Zero Sr/s; 2025 Zero Sr/s.
None of these model years has a page on this site (it covers EPA-certified cars, trucks and SUVs from 2016), so the bulletin is listed here on its own.
Common questions
Source: NHTSA, 49 CFR 579.5Is Zero MBB-44 / BMU-19 a recall?
No. A over-the-air update 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.
Is the MBB-44 / BMU-19 repair free?
A over-the-air update 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 MBB-44 / BMU-19 cover?
The manufacturer filed it against 24 model years: 2024 Zero DS, 2025 Zero DS, 2024 Zero DSR, 2025 Zero DSR, 2023 Zero Dsr/x, 2024 Zero Dsr/x and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.