Proterra Catalyst, model years 2018 to 2020. Filed by Proterra Inc. and reported to NHTSA on 28 October 2020. 5 vehicles potentially affected.
What the notice says Proterra Inc. (Proterra) is recalling certain 2018-2020 35 foot and 40 foot Catalyst buses. Lack of plexus adhesive between the torque plate and the vehicle chassis may cause the bolts securing the steering gear box to loosen.
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-20-154. That is the number on the owner letter and on the dealer paperwork. 20V664 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 20V664 cover?
- Proterra Catalyst, model years 2018-2020.
- What is wrong with them?
- Proterra Inc. (Proterra) is recalling certain 2018-2020 35 foot and 40 foot Catalyst buses. Lack of plexus adhesive between the torque plate and the vehicle chassis may cause the bolts securing the steering gear box to loosen.
- What can happen if it is not put right?
- An unsecured steering gear box could cause the driver to lose the ability to steer the vehicle, increasing the risk of crash or injury.
- Is there a fix yet?
- Yes, and it is free. Proterra will notify owners, and dealers will inspect the steering gear mounting bolts and the plexus adhesive layer between the torque plate and the chassis. If the plexus adhesive layer is missing or insufficient, the components will be repaired, free of charge.
- 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-20-154, 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: “An unsecured steering gear box could cause the driver to lose the ability to steer the vehicle, increasing the risk of crash or injury.”
affected
in the notice
caught
| Campaign | 20V664 |
|---|---|
| Filed by | Proterra Inc. |
| System at fault | Steering:Gear Box (Other Than Rack And Pinion) |
| Reported to NHTSA | 28 October 2020 |
| Model years | 2018-2020 |
| Vehicles named | PROTERRA CATALYST |
What the notice says today
The consequence
An unsecured steering gear box could cause the driver to lose the ability to steer the vehicle, increasing the risk of crash or injury.
The remedy
Proterra will notify owners, and dealers will inspect the steering gear mounting bolts and the plexus adhesive layer between the torque plate and the chassis. If the plexus adhesive layer is missing or insufficient, the components will be repaired, free of charge. The recall began December 10, 2020. Owners may contact Proterra customer service at 1-864-438-0000. Proterra's number for this recall is SC-20-154.
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 745 notices in the record whose component field names steering. Across that group the median wait before owners were written to was 39 days.
Last checked . No change has been recorded in the wording.
The models named here, across their whole recall history
How to cite this record
Quoting the wording on this page means quoting a version, so the date belongs in the citation:
CarsMultiverse, recall 20V664, wording as read on 16 September 2026. https://carsmultiverse.com/recall/20v664/
The cross-border matches used on this site are deposited as a citable dataset: doi:10.5281/zenodo.22087136. The recall wording itself is published by the national authority named above and is theirs, not ours.
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
- 22V855: 2020-2021 Catalyst and 2019-2022 ZX5 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
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 20V664 on 23 August 2026, they were:
- Defect summary
883f794f - Consequence
aefcc8e8 - Remedy
be757c8c
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 20V664 · 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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