2021 Zero Sr problems, complaints & recalls
Safety recalls (1)
Electrical System:propulsion System:dc/Dc Converter 2020-10-15 · campaign 20V640000 · 64 vehicles
Defect: Zero Motorcycle Inc. (Zero) is recalling certain 2021 SR, S, DSR, DS, FX, and FXS motorcycles. The DC-DC converter has an insufficient power output margin to operate the anti-lock braking system (ABS), instruments, lights, indicators, and any accessories that are connected to the accessory outlet at once.
Risk: The DC-DC converter can shut off when its power capacity is exceeded, shutting off the ABS, instruments, and lights, increasing the risk of a crash.
Fix: Zero will notify owners, and dealers will replace the DC-DC converter, free of charge. The recall began October 26, 2020. Owners may contact Zero customer service at 1-888-841-8085. Zero's number for this recall is SV-ZMC-021-019.
Service bulletins (6)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Unknown Or Other 2026-06-09 · Cypher III OTA Firmware · Over The Air
cypher 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 m
Unknown Or Other 2026-05-13 · ZMDN-052026 · Other
new diagnostic tool tuner is available for 2017 and newer model.s on may 15th, a new firmware will be released for our fst / cypher iii models, primarily focused on improving cybersecurity.
Equipment 2023-10-24 · Chain Kit Recall · Service Bulletin/Repair Instructions
dealer notification of chain kit recall (23e074).
Electrical System 2022-11-22 · Dealer News · Service Bulletin/Repair Instructions
zero motorcycles dealer news 11.22.22 - new firmware, diag4zero, holiday hours
Electrical System 2022-08-30 · ZMDN 83022 · Service Bulletin/Repair Instructions
cypher ii firmware update notice
Electrical System 2022-06-28 · CypherIIFirmware · Service Bulletin/Repair Instructions
a firmware update will be released tomorrow june 29 at 7am pt for my17-my23 zero motorcycles that operate on the cypher ii platform.
What owners report
No detailed complaint narratives on file.
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.