Zero over-the-air update MBB-44 / BMU-19
What it saysDealer notification announcing new firmware for certain models of Zero Motorcycles. NHTSA’s full summary ↓
Zero filed this with NHTSA as an 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). An 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 | PDF, 1,116 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 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.
More bulletins about the fuel/propulsion system
Source: same model, same component group1 other manufacturer communication filed against these Zero models under the same component group (fuel/propulsion system), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| SV-RCL-025-021 | Service campaign | Dec 20, 2025 | Initial notice to dealers of the upcoming recall (25V-834). |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Zero, by the number printed on the letter.
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.