2018 Proterra Catalyst problems, complaints & recalls

2018 Proterra Catalyst recalls (9)

• Recall 22V887000Nov 30, 2022300 vehicles
  ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY

  Proterra Operation Company, Inc. (Proterra) is recalling certain 2017-2019 Catalyst transit buses. One or more battery packs may allow liquid to leak into and accumulate in the battery pack enclosure.

  Risk: The accumulation of liquid inside the battery pack enclosure increases the risk of a fire.

  Remedy: Proterra will update software, inspect, and replace the battery pack, free of charge. Owner letters were mailed November 6, 2023. Owners may contact Proterra's customer service at 1-864-438-0000.

• Recall 22V114000Feb 28, 2022724 vehicles
  STEERING:GEAR BOX (OTHER THAN RACK AND PINION)

  Proterra, Inc. (Proterra) is recalling certain 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. The plexus adhesive between the torque limiter plate and the bus body may be insufficient, causing the bolts that secure the steering gearbox to loosen.

  Risk: A loose steering gearbox can cause a loss of steering control, increasing the risk of a crash.

  Remedy: Dealers will install a mechanical fastener and new bolts on the steering gearbox, and install a new torque plate, as necessary, free of charge. Owner notification letters were mailed October 7, 2022. Owners may contact Proterra's customer service at 1-864-438-0000.

• Recall 20V664000Oct 28, 20205 vehicles
  STEERING:GEAR BOX (OTHER THAN RACK AND PINION)

  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.

  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.

  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.

• Recall 19V460000Jun 14, 201921 vehicles
  STRUCTURE:EMERGENCY:ESCAPE/EGRESS/EXIT

  Proterra, Inc. (Proterra) is recalling certain 2018-2019 Catalyst buses equipped with a certain batch of glass roof hatches. Temperature and vibration stresses may cause the tempered glass roof hatch to shatter.

  Risk: If the tempered glass roof hatch shatters, glass fragments may fall onto passengers, increasing the risk of an injury.

  Remedy: Proterra will notify owners, and the glass hatch manufacturer will provide replacement hatch lids, free of charge. The recall began August 13, 2019. Owners may contact Proterra at 1-864-438-0000. Proterra's number for this recall is SC-19-79.

• Recall 19V402000May 30, 2019147 vehicles
  SERVICE BRAKES, AIR:SUPPLY:CHECK VALVE

  Proterra, Inc. (Proterra) is recalling certain 2017-2018 Catalyst buses. The vehicles are equipped with swivel valves that may insufficiently protect the air brake system from an air leak between the service reservoir and the source of air pressure. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 121, "Air Brake Systems."

  Risk: If the swivel valves are unable to protect the air brake system against loss of air pressure, this may lead to service brake failure and the possibility for the uncontrolled application of the safety brake. Either condition increases the risk of crash.

  Remedy: Proterra will notify owners, and will replace the swivel valve with a check valve that is sufficient to protect the air brake system, free of charge. The recall began July 26, 2019. Owners may contact Proterra customer service at 1-864-438-0000.

• Recall 19V283000Apr 9, 201939 vehicles
  SERVICE BRAKES

  Proterra, Inc. (Proterra) is recalling certain 2015-2018 Catalyst 40 buses equipped with an optional tow fitting and airline that allows a tow truck to operate the rear brakes on the vehicle. The mesh cap covering the airline for the tow fitting can be clogged with road debris in inclement weather, possibly resulting in a build up of air pressure in the rear brake system.

  Risk: A build up of air pressure can cause the brakes to drag and possibly overheat, increasing the risk of fire.

  Remedy: Proterra will notify owners, and dealers will install an additional shield to the tow fitting that protects the mesh cap, free of charge. The recall began June 4, 2019. Owners may contact Proterra customer service at 1-864-438-0000.

• Recall 19V062000Jan 30, 2019310 vehicles
  SUSPENSION:FRONT · TIRES

  Proterra Inc., (Proterra) is recalling certain 2015-2018 Catalyst 40 and 35 transit buses. The affected vehicles are equipped with a four point height control system that may cause a load imbalance, overloading the front tires.

  Risk: An overloaded front tire may fail unexpectedly, increasing the risk of crash.

  Remedy: Proterra will notify owners, and dealers will convert the current four point ride height system into a three point system to prevent the front tires from being overloaded, free of charge. The recall began March 26, 2019. Owners may contact Proterra customer service at 1-864-438-0000.

• Recall 19V061000Jan 29, 201955 vehicles
  SERVICE BRAKES, AIR:SUPPLY:RESERVOIR/TANK

  Proterra Inc., (Proterra) is recalling certain 2015-2018 Catalyst 40 transit buses. The affected vehicles lack a Graham White air brake supply reservoir, possibly resulting in long term moisture build up in the air brake system. As a result, these vehicles fail to comply with Federal Motor Vehicle Safety Standard (FMVSS) number 121, "Air Brake Systems."

  Risk: Built-up of moisture in the air brake system may lead to brake failure, increasing the risk of crash.

  Remedy: Proterra will notify owners, and dealers will install a supply reservoir with a drain between the air dryer and the air supply manifold, free of charge. The recall is expected to begin March 28, 2019. Owners may contact Proterra customer service at 1-864-438-0000.

• Recall 19V034000Jan 16, 2019184 vehicles
  EQUIPMENT:OTHER:LABELS

  Proterra, Inc is recalling certain 2015-2018 Catalyst 40, and Catalyst 35 buses. The certification label may list an incorrect gross front axle weight rating and/or incorrect tire pressures. As such, these vehicles fail to comply with the requirements of 49 CFR Part 567, "Certification."

  Risk: If the tire pressure is understated, an underinflated tire may result in an increased risk of tire failure, increasing the risk of a crash.

  Remedy: Proterra will notify owners, and dealers will replace the certification labels with correct information for all affected customers, free of charge. The recall began March 12, 2019. Owners may contact Proterra customer service at 1-864-438-0000.

NHTSA defect investigations

• RQ25001Opened Jun 27, 2025Open

  Remedy Effectiveness of Recall 22V887

  In November 2022, Proterra Operating Company, Inc. (Proterra) filed a safety recall (NHTSA recall 22V887) covering nineteen 2017-2019 Proterra Catalyst transit buses to address the potential of liquid accumulation in the 400-volt battery packs, increasing the risk of a fire. On December 16, 2022, Proterra mailed an interim owner notification letter stating that Proterra would physically inspect and analyze each recalled battery pack.In October 2023, Proterra amended their filing to now cover 300 vehicles, with a final remedy plan of updating the battery monitoring software. According to the fi…

Recent 2018 Proterra Catalyst complaints

Excerpts of the newest owner complaints, lightly cleaned of personal details. Complaints are unverified owner reports.

No narrative complaints on file.

Compare the 2018 Proterra Catalyst with another vehicle →

Source: U.S. National Highway Traffic Safety Administration (NHTSA) Office of Defects Investigation public data, as of Oct 11, 2026. Complaints are submitted by owners and are not verified by NHTSA or by us; a complaint does not prove a defect exists. View this vehicle on NHTSA.gov Methodology