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.
The remedy
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.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|---|
| Proterra Catalyst | 2020, 2021 |
| Proterra ZX5 | 2019, 2020, 2021, 2022 |
Components: PARKING BRAKE
Model years in this recall
NHTSA complaints and the number of recall campaigns for each model year this recall covers.
| Model | Year | Complaints | Recalls |
|---|---|---|---|
| Proterra Catalyst | 2020 | 0 | 8 |
| Proterra Catalyst | 2021 | 1 | 5 |
| Proterra ZX5 | 2019 | 0 | 3 |
| Proterra ZX5 | 2020 | 0 | 6 |
| Proterra ZX5 | 2021 | 0 | 6 |
| Proterra ZX5 | 2022 | 0 | 6 |
Other parking brake recalls in 2022
10 of the 933 recall campaigns reported to NHTSA in 2022 concerned the parking brake; Proterra Operating Company, Inc. filed 5 campaigns in all.
| 22V790000 20 Oct 2022 | Orange EV |
| 22V776000 14 Oct 2022 | Shyft Group |
| 22V682000 12 Sept 2022 | Spartan Fire, LLC |
| 22V530000 22 Jul 2022 | Lion Electric Company |
| 22V468000 30 Jun 2022 | Daimler Trucks North America, LLC |
| 22V364000 20 May 2022 | General Motors, LLC |
| 22V322000 11 May 2022 | Kia Motors America |
| 22V324000 11 May 2022 | Hyundai Motor America |
NHTSA recalls (public domain) · all recalls of 2022