Proterra Catalyst, Proterra Zx5, model years 2019 to 2022. Filed by Proterra Operating Company, Inc. and reported to NHTSA on 18 November 2022. 386 vehicles potentially affected.
What the notice says 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.
Is your vehicle included? Check with your VIN at NHTSA, or ask a dealer. This page is an independent copy of the notice, kept so you can see what changed after it was published. It is not the authority, and the authority’s own text is the one to act on.
Proterra's own number for this recall: SC-22-158. That is the number on the owner letter and on the dealer paperwork. 22V855 is the number NHTSA gave the same campaign, and the number this page is filed under. They are one recall, written two ways.
What owners ask about this recall
- Which vehicles does recall 22V855 cover?
- Proterra Catalyst, Proterra ZX5, model years 2019-2022.
- What is wrong with them?
- 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.
- What can happen if it is not put right?
- Unintentional engagement of the parking brake increases the risk of a crash.
- Is there a fix yet?
- Yes, and it is free. 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.
- What should I do now?
- Check your own vehicle by its VIN with NHTSA, which is the record to act on. Proterra calls this recall SC-22-158, which is the number on the owner letter and the dealer paperwork.
Answered from the register this site holds. NHTSA is the record to act on.
What the authority says can happen if this is not fixed: “Unintentional engagement of the parking brake increases the risk of a crash.”
affected
in the notice
caught
| Campaign | 22V855 |
|---|---|
| Filed by | Proterra Operating Company, Inc. |
| System at fault | Parking Brake |
| Reported to NHTSA | 18 November 2022 |
| Model years | 2019-2022 |
| Vehicles named | PROTERRA CATALYST, PROTERRA ZX5 |
What the notice says today
The consequence
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.
What it said before
This campaign is in the register but not yet in the dated wording archive, so we cannot yet say whether its text has moved. It enters the archive on the next pass.
This is one of 175 notices in the record whose component field names parking brake. Across that group the median wait before owners were written to was 49 days.
The models named here, across their whole recall history
The recall record and its wording are published by the US National Highway Traffic Safety Administration and are US Government public domain. The dated archive, the comparison and any before-and-after above are CarsMultiverse. How fresh every engine behind this page is, is public on the status page. To check a specific vehicle, use NHTSA’s own VIN lookup.
Other Proterra notices we hold
- 23V697: 2019-2022 40' and 35' Catalyst 800V transit buses equipped with ProDrive 1
- 23V078: 2020-2022 35" Catalyst, 35" ZX5, and 40" ZX5
- 22V887: 2017-2019 Catalyst transit buses
- 22V829: 2022 ZX5 transit buses
- 22V114: 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
- 22E065: battery packs, model number S1-15, with part numbers 129-6202, 139-6181, and 163-3642
- 22E052: High Voltage Junction Box (HVJB) DC Links, with part number 051071
- 21V268: 2019-2020 Catalyst 40 foot buses
All 20 Proterra campaigns we hold · Every manufacturer in the record
The fingerprint of this notice
We take a SHA-256 of each of the three blocks of text the authority publishes and keep the first eight characters. As we last read campaign 22V855 on 23 August 2026, they were:
- Defect summary
cba0ce0d - Consequence
e5221899 - Remedy
8b0ac132
We first read this notice on 21 August 2026. It has not moved since. If it ever does, these characters will not match, and the change will be dated here.
The wording we hold for 22V855 · how the whole register is watched
This notice names one vehicle among several registers that have written about it. Every notice this site holds for the Proterra Catalyst, in all seven, is kept on that vehicle's own page, with the newest in each.
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Owners of these cars
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