Complaints over time
Complaints about the 2021 Zero SR/S peaked in 2022, with 1 filed
Owner complaints about this model year, by the year they were filed with NHTSA.
Source: NHTSA ODI complaints file. The lighter column runs through October.
Model year
2021 Zero SR/S
Motorcycle, built in United States. Owner complaints on file from Oct 7, 2022 to Oct 7, 2022.
Recall campaigns covering this model year0No recall campaign lists this model year
Owner complaints1Close to the median 2021 motorcycle
Severity index0.02021 motorcycles average 5.8
First 24 months0Complaints in its first two years
Components
100% of complaints about the 2021 Zero SR/S name electrical system
Owner complaints by component. Hover or focus a bar for the crash, fire, injury or death count.
Source: NHTSA ODI complaints file. A complaint can name more than one component; it is counted under the first.
Recalls
No recall campaign lists the 2021 Zero SR/S
Check a specific vehicle by VIN on NHTSA's site: a campaign may cover only part of a model year's production.
Source: NHTSA ODI recalls file.
Owner complaints
What owners reported about the 2021 Zero SR/S
The full text of every complaint filed with NHTSA about this model year, newest first. Complaints are filed by owners and are not verified by NHTSA; NHTSA removes personal details before publishing.
1 complaint on file, page 1 of 1.
- Filed Oct 7, 2022Failure Jul 7, 20221,000 milesHighlands Ranch, CO12v/24v/48v battery
The contact owns a 2021 Zero SR/S Motorcycle. The contact stated while riding 40 MPH with the motorcycle in Eco Mode, he released the throttle and felt the motorcycle stall and lose power. The contact was able to pull over. The motorcycle was taken to the dealer and the battery and control unit were replaced; however, the motorcycle was not functioning as designed. The manufacturer was contacted and stated that the motorcycle operated as designed. The failure mileage was 1,000. The contact stated that the bike still remains at the shop because it is still malfunctioning. A replacement and a refund have been requested from both the dealer and the manufacturer; all requests were denied.
NHTSA complaint 11488421
Source: NHTSA ODI complaints file.
Investigations
NHTSA has not opened an investigation on this model year
Source: NHTSA ODI investigations file.
Service bulletins
12 manufacturer communications cover this model year
Technical service bulletins and other notices the manufacturer sent to dealers. A bulletin is not a recall.
- ZMDN082026-01 Aug 11, 2026 · Other
We would like to inform you that a new firmware release for the 2020+ Cypher III platform will soon be available. 2020+ SR/F & SR/S + 2022–25 SR + 2023+ DSR/X + 2024+ S, DS & DSR Firmware Versions MBB V46, BMU V22, BMS V28 New Features & Improvements •Th… - Cypher III OTA Firmware Jun 9, 2026 · 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 syst… - ZMDN-052026 May 13, 2026 · 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. - ZMDN-022026 Feb 2, 2026 · Over The Air
Dealer notification announcing new firmware for certain models of Zero Motorcycles. - Dealer News 102925 Oct 29, 2025 · Other
Dealer notification of release of new firmware for specific motorcycles. - Firmware Release Oct 12, 2023 · Service Bulletin/Repair Instructions
Dealer notification of new firmware for motorcycle models. - New Firmware 5-2 May 2, 2023 · Service Bulletin/Repair Instructions
Today, May 2, 2023, Zero Motorcycles has released a new firmware version for all motorcycles utilizing the Cypher III operating system. - Dealer News Nov 22, 2022 · Service Bulletin/Repair Instructions
Zero Motorcycles Dealer News 11.22.22 - New Firmware, Diag4Zero, Holiday Hours - Cypher III FW Oct 25, 2022 · Service Bulletin/Repair Instructions
Zero Motorcycles Firmware Release Notes October 26, 2022 MY20/21/22/23 Cypher III MBB Rev 27/6 BMU Rev 6/4 BMS Rev 21 Fixes an issue in ride mode display. - Cypher III MBB F Sep 27, 2022 · Service Bulletin/Repair Instructions
Zero Motorcycles would like to remind all dealers that a full PDI should be completed prior to any vehicle being displayed on the sales floor or ridden by dealership staff or customers. - Cypher III Firmw Sep 20, 2022 · Service Bulletin/Repair Instructions
Zero Motorcycles will release new firmware for all motorcycles using the Cypher III operating system. This release improves functionality of certain hibernation functions, long term storage and resolves an issue that caused Stability Control faults to fa… - CypherIIIUpdate Jul 19, 2022 · Service Bulletin/Repair Instructions
Zero Motorcycles will be releasing the next version of firmware for motorcycles operating on the Cypher III platform on Wednesday July 20.
Source: NHTSA manufacturer communications files.