2018–2020 Proterra Catalyst Recall: Lack of plexus adhesive between the torque plate and the vehicle chassis…
NHTSA campaign 20V664000 · Steering · filed Oct 28, 2020 · verified Jul 30, 2026
The defect
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.
The risk
An unsecured steering gear box could cause the driver to lose the ability to steer the vehicle, increasing the risk of crash or injury.
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 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.
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.safercar.gov.
Affected vehicles
Related recalls
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Other campaigns involving Proterra vehicles
Source: NHTSA recall database, campaign 20V664000 (manufacturer number SC-20-154). Data last verified Jul 30, 2026.