2020–2021 Proterra Catalyst, 2019–2022 Proterra ZX5 Recall: Back pressure in the shared air exhaust for the pneumatic ride height…
NHTSA campaign 22V855000 · Parking Brake · filed Nov 18, 2022 · verified Jul 30, 2026
The defect
Proterra Operating Company, Inc. (Proterra) is recalling certain 2020-2021 Catalyst and 2019-2022 ZX5 transit buses. Back pressure in the shared air exhaust for the pneumatic ride height system and parking brake control valve may engage the parking brake while the vehicle is in motion.
The risk
Unintentional engagement of the parking brake increases 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
Proterra will install a redesigned air circuit, free of charge. Owner notification letters were mailed on December 21, 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
- 2019–2021 Proterra Catalyst and 1 other model — Vehicle controller software may allow the electrical…
- 2019–2022 Proterra Catalyst and 1 other model — A transistor inside the inverter may overheat and fail…
- 2020–2022 Proterra Catalyst and 1 other model — Windshield wiper motors may operate intermittently or may…
- 2017–2019 Proterra Catalyst — One or more battery packs may allow liquid to leak into and…
- 2015–2022 Proterra Catalyst and 1 other model — Plexus adhesive between the torque limiter plate and the…
Other campaigns involving Proterra vehicles
Source: NHTSA recall database, campaign 22V855000 (manufacturer number SC-22-158). Data last verified Jul 30, 2026.