2015–2022 Proterra Catalyst, 2015–2022 Proterra ZX5 Recall: Plexus adhesive between the torque limiter plate and the bus body may be…
NHTSA campaign 22V114000 · Steering · filed Feb 28, 2022 · verified Jul 30, 2026
The defect
Proterra, Inc. (Proterra) is recalling certain 2017-2019 35 foot Catalyst E2, 2017-2019 40 foot E2, 2020-2021 35 foot RR, 2019-2020 40 foot RR, 2019-2022 40 foot ZX5, and 2020-2022 35 foot ZX5 buses. The plexus adhesive between the torque limiter plate and the bus body may be insufficient, causing the bolts that secure the steering gearbox to loosen.
The risk
A loose steering gearbox can cause a loss of steering control, increasing the risk of a crash.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →The fix — what to do
Dealers will install a mechanical fastener and new bolts on the steering gearbox, and install a new torque plate, as necessary, free of charge. Owner notification letters were mailed October 7, 2022. Owners may contact Proterra's customer service at 1-864-438-0000.
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.
Affected vehicles
Related recalls
More Proterra Catalyst recalls
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- 2017–2019 Proterra Catalyst — One or more battery packs may allow liquid to leak into and…
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Other campaigns involving Proterra vehicles
Source: NHTSA recall database, campaign 22V114000 (manufacturer number SC-22-040). Data last verified Jul 30, 2026.