AI DamageProterra Catalyst: problems, complaints, bulletins
Summary for the Proterra Catalyst across 6 model years: 0 owner complaints and 174 NHTSA service bulletins, plus repair videos. Pick a year for details.
Model years
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 0 | 0 | 158 |
| Structure | 0 | 0 | 114 |
| Service brakes | 0 | 0 | 49 |
| Powertrain | 0 | 0 | 46 |
| Fuel/propulsion system | 0 | 0 | 29 |
| Steering | 0 | 0 | 24 |
| Equipment | 0 | 0 | 13 |
| Suspension | 0 | 0 | 13 |
| Engine | 0 | 0 | 8 |
| Engine and cooling | 0 | 0 | 7 |
| Exterior lighting | 0 | 0 | 5 |
| Visibility | 0 | 0 | 5 |
| Seats | 0 | 0 | 4 |
| Parking brake | 0 | 0 | 1 |
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Structure. Rails, pillars, panel gaps, signs of pulling or welding.
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- Pin location change on an ECU to properly assign both doors open signal and the horn relay signal
- Transit bus repair to upgrade the ABS controller to communicate with clever ITS ABS monitoring
- Transit bus software update to the HVAC provided by the vendor due to the ability to heat with no cabin…
- Transit bus repair to modify the plumbing of the hill hold solenoid to see slightly more pressure
- Transit bus repair to reduce or eliminate power steering noise on the 35' buses
- Transit bus repair to the coolant reservoir to prevent damage to the expansion tanks on the roof
- Transit bus software upgrade to the body, vehicle and dash controllers to improve diagnostic fault…
- Transit bus repair to the aux heater drain plug for sizing and material appears the bill of materials…
- Transit bus repair to the defroster unit to add an additional temp sensor to have a back up for…
- Transit bus repair to the ADA ramp as the ramp was not deploying to ground level
- Transit bus repair to replace a fitting on the fire suppression system that has potential to chaff against…
- Transit bus repair to specific high mirrors and replacing their mounting hardware to robust hardware
Other models of this make
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-04.