Zero bulletin MBB V45, BMU V21, BMS V27
Zero filed this with NHTSA as a over-the-air update dated Jun 9, 2026, received Jul 6, 2026, about the fuel/propulsion system — 1 document under this number: Cypher III OTA Firmware. It names 44 model years (2020–2026). 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 communicationCYPHER III OTA FIRMWARE RELEASE Coming Soon The latest firmware release (MBB V45, BMU V21, BMS V27) for 2020+ Cypher III motorcycles will be available Over The Air to customers on June 17. This release includes: Bug fixes Security improvements General system stability enhancements While customers may simply see an update notification, dealers should be aware that this release marks an important transition toward the Tuner diagnostic tool. For motorcycles running the latest Cypher III firmware, Tuner will become the primary tool for many service and maintenance functions moving forward. If your dealership hasn't explored Tuner yet, now is the perfect time to get started.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| Cypher III OTA Firmware | Over-the-air update | Jun 9, 2026 | 11034503 | PDF, 3,445 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: 2020 Zero DS; 2021 Zero DS; 2023 Zero DS; 2024 Zero DS; 2025 Zero DS; 2026 Zero DS; 2020 Zero DSR; 2021 Zero DSR; 2023 Zero DSR; 2024 Zero DSR; 2025 Zero DSR; 2026 Zero DSR; 2023 Zero Dsr/x; 2024 Zero Dsr/x; 2025 Zero Dsr/x; 2026 Zero Dsr/x; 2023 Zero Dsrp; 2024 Zero Dsrp; 2025 Zero Dsrp; 2020 Zero S; 2021 Zero S; 2023 Zero S; 2024 Zero S; 2025 Zero S; 2026 Zero S; 2020 Zero SR; 2021 Zero SR; 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; 2026 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; 2026 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 V45, BMU V21, BMS V27 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 V45, BMU V21, BMS V27 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 V45, BMU V21, BMS V27 cover?
The manufacturer filed it against 44 model years: 2020 Zero DS, 2021 Zero DS, 2023 Zero DS, 2024 Zero DS, 2025 Zero DS, 2026 Zero DS and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.