AutoStatsIQ
Data through Oct 2026
Model year

2021 Proterra Catalyst

Bus, electric, built in United States. Owner complaints on file from Sep 25, 2024 to Sep 25, 2024.

Recalls (5)Complaints (1)Investigations (0)Bulletins (55)
Recall campaigns covering this model year52,083 vehicles or units across those campaigns
Owner complaints1Not enough peers on file
Severity index0.02021 buss average 0.0
First 24 months0Complaints in its first two years
Complaints over time

Complaints about the 2021 Proterra Catalyst peaked in 2024, with 1 filed

Owner complaints about this model year, by the year they were filed with NHTSA.

00.250.50.7512024120252026
Source: NHTSA ODI complaints file. The lighter column runs through October.
Components

100% of complaints about the 2021 Proterra Catalyst name electrical system

Owner complaints by component. Hover or focus a bar for the crash, fire, injury or death count.

Electrical system
1
Source: NHTSA ODI complaints file. A complaint can name more than one component; it is counted under the first.
Recalls

5 recall campaigns cover the 2021 Proterra Catalyst

Check a specific vehicle by VIN on NHTSA's site: a campaign may cover only part of a model year's production.

Recall campaigns for the 2021 Proterra Catalyst
CampaignFiledSubjectComponentVehiclesRemedy
24V-655Sep 6, 2024Vehicle controller software may allow the electrical circuit for the radiator fan to overheatElectrical system483Software update
23V-697Oct 17, 2023Transistor inside the inverter may overheat and fail, which can result in a loss of power steering and drive powerElectrical system238Part replacement
23V-078Feb 13, 2023Windshield wiper motors may operate intermittently or may fail to operateVisibility and wipers252Part replacement
22V-855Nov 18, 2022Back pressure in the shared air exhaust for the pneumatic ride height system and parking brake control valve may engage the parking brake while…Brakes386Repair or modification
22V-114Feb 28, 2022Plexus adhesive between the torque limiter plate and the bus body may be insufficient, causing the bolts that secure the steering gearbox to loosenSteering724Repair or modification
Source: NHTSA ODI recalls file.
Look up a VIN at NHTSA
Owner complaints

What owners reported about the 2021 Proterra Catalyst

The full text of every complaint filed with NHTSA about this model year, newest first. Complaints are filed by owners and are not verified by NHTSA; NHTSA removes personal details before publishing.

1 complaint on file, page 1 of 1.

  1. Filed Sep 25, 2024Failure Jan 2, 202415,000 milesDurham, NCElectrical system

    The contact called on behalf of the University that owns several 2021 Proterra Catalyst Transit Bus. The University received notification of NHTSA Campaign Number: 23V697000 (Electrical System); however, the part to do the recall repair was unavailable. The local dealer was contacted, and it was confirmed that the part was not available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact stated that there was an unstated electrical failure with one of the buses, rendering the bus inoperable. The cause of the failure was not yet determined. The vehicle was not repaired. The contact stated that there were seven additional buses included in the fleet. The failure mileage was 15,000. Parts distribution disconnect.

    NHTSA complaint 11616330
Source: NHTSA ODI complaints file.
Investigations

NHTSA has not opened an investigation on this model year

Source: NHTSA ODI investigations file.
All investigations
Service bulletins

55 manufacturer communications cover this model year

Technical service bulletins and other notices the manufacturer sent to dealers. A bulletin is not a recall.

  • SC-20-140 Jun 1, 2021 · Service Bulletin/Repair Instructions
    Transit bus repair for the rear door VIP sensors. This repair provides a clip to go behind the sensor to keep it from falling down.
  • SC-20-148 Sep 1, 2021 · Service Bulletin/Repair Instructions
    Transit bus steering column maintenance document to supplement maintenance and repair manual.
  • SC-20-159 Mar 11, 2021 · Service Bulletin/Repair Instructions
    Transit bus repair to the side windows to include a larger sealing gasket to prevent water from entering cabin.
  • SC-21-001 Nov 12, 2021 · Service Bulletin/Repair Instructions
    Transit bus repair to the wheel well compartment hinge. The compartment lid was previously bonded on, this repair instructions updates the vehicle to use fasteners as well.
  • SC-21-034 Sep 21, 2021 · Service Bulletin/Repair Instructions
    Transit bus repair to the air compressor, the previous banjo fitting was prone to leaking, the solid drain plug prevents compressor from losing oil.
  • SC-21-045 Mar 18, 2021 · Service Bulletin/Repair Instructions
    Transit bus torque verification on the intermediate steering shaft.
  • SC-21-048 Aug 30, 2021 · Service Bulletin/Repair Instructions
    Transit bus fleet check to inspect the steering gearboxes and replace hardware.
  • SC-21-056 May 20, 2021 · Service Bulletin/Repair Instructions
    Transit bus repair to the HVAC, the supply air temperature sensor is being replaced to improved sealed sensor provided by our HVAC OEM. The sensor failure prevents the HVAC from running.
  • SC-21-077 Jun 4, 2021 · Service Bulletin/Repair Instructions
    Transit bus software update to the batteries, charge controller and vehicle controller. Fixes coolant level LEDs, ESM updated specific parameters around temperatures and auto pack configuration, BMS SW resolves brick imbalance, min/max humidity levels.
  • SC-21-083 Jan 7, 2022 · Service Bulletin/Repair Instructions
    Transit bus repair to horn, the horn relay is retrofitted in this document with a improved relay design.
  • SC-21-086 Aug 17, 2021 · Service Bulletin/Repair Instructions
    Transit bus software update to the batteries, charge controller and vehicle controller. Fixes coolant level LEDs, ESM updated specific parameters around temperatures and auto pack configuration.
  • SC-21-097 Sep 8, 2021 · Service Bulletin/Repair Instructions
    Transit bus torque verification on the 3 phase power junction box for the air compressor.
  • SC-21-106 Sep 22, 2021 · Service Bulletin/Repair Instructions
    Transit bus software to fix bugs and reduce nuisance faults. Creates new EEPROMs for specific customer requests also updates logic for vehicles exterior lights to have cornering lights while in night mode.
  • SC-21-110 Dec 3, 2021 · Service Bulletin/Repair Instructions
    Transit bus repair to the Dash wiring in which it was missing illumination on the dash when Hazards, Stop Request, and pedal adjustment when pressed. Adds power to splice pack BD050.
  • SC-21-119 Jan 4, 2022 · Service Bulletin/Repair Instructions
    Transit bus repair at the front charge port compartment to update the hardware used on the hinges to be corrosion protected.
  • SC-21-139 Dec 1, 2021 · Service Bulletin/Repair Instructions
    Transit bus software update the HVAC controllers from our supplier. Adds additional protection from over current and logic for the heater safety switch faults that can occur on shutdown and restart.
  • SC-21-147 Oct 13, 2022 · Service Bulletin/Repair Instructions
    Transit bus repair for rear modesty panel to replace wall bracket that is prone to cracking.
  • SC-21-158 Apr 22, 2022 · Service Bulletin/Repair Instructions
    Transit bus repair for the ADA ramp closeout bracket on the exterior of the bus. The replacement part is made from stainless steel reducing the previous mild steel that was corroding.
  • SC-21-159 Jan 22, 2022 · Service Bulletin/Repair Instructions
    Transit bus bulletin to install snorkel to air compressor to prevent water and road grim from entering the intake.
  • SC-21-161 Aug 16, 2022 · Service Bulletin/Repair Instructions
    Transit bus repair at the rear doors, door seal is screw into the body. This repair procedure includes installing inserts into the body to keep seal from coming loose.
  • SC-21-170 Feb 2, 2022 · Service Bulletin/Repair Instructions
    Transit bus repair instruction for compartment for an extended latch catch.
  • SC-21-174 Jan 5, 2022 · Service Bulletin/Repair Instructions
    Transit bus repair on the high voltage batteries. An improper ground screw might have been installed causing the battery to go offline and reduce range of the vehicle.
  • SC-21-181 Mar 22, 2022 · Service Bulletin/Repair Instructions
    Transit bus inspections for shipping blocks installed in egress windows to ensure proper closing/latching.
  • SC-21-183 Jan 27, 2022 · Service Bulletin/Repair Instructions
    Transit bus repair instructions to install a drain in the cavity where the ADA ramp sits.
  • SC-22-003 Feb 26, 2022 · Service Bulletin/Repair Instructions
    Transit bus procedure to inspect torque strips on the steering gearbox and record breakaway values then replacing the hardware and using blue loctite to reinstall.
  • SC-21-027 Mar 12, 2021 · Service Bulletin/Repair Instructions
    Transit bus repair to the rear doors, instruction provided require a new bolt to be added to the mechanism.
  • SC-21-176 Nov 8, 2022 · Service Bulletin/Repair Instructions
    Transit bus torque update to HVJB in the rear trunk of the bus.
  • SC-21-103 May 24, 2022 · Service Bulletin/Repair Instructions
    Repair instructions for rooftop passthrough if wires have heat damage. Related to 24V-655, prior to remedy.
  • SC-21-149 Dec 8, 2022 · Service Bulletin/Repair Instructions
    On the transit battery electric buses it was found that some of the HV batteries had a configuration improperly set causing the battery to not balance correctly reducing the vehicles range.
  • SC-21-019 Feb 13, 2021 · Service Bulletin/Repair Instructions
    Transit vehicle repair instructions for replacing a ride height manifold due to EMI sensor failures.
  • FC-22-157 Oct 12, 2022 · Service Bulletin/Repair Instructions
    Fleet check repair instruction for heavy duty transit buses to inspect for connector between interlock and ATC being installed in the wrong location.
  • FC-23-006 Nov 29, 2022 · Service Bulletin/Repair Instructions
    Repair instructions for the telemetry system on the heavy duty transit buses if the system is not reporting.
  • IB-23-032 Oct 6, 2022 · Service Bulletin/Repair Instructions
    Service Bulletin for an alternative coolant temp sensor for transit buses as the original sensor installed is challenging to purchase due to supply constraints.
  • SC-22-001 Feb 28, 2023 · Service Bulletin/Repair Instructions
    Service Bulletin Instructions for a torque verification due to a supplier issue on the steering gearbox housing.
  • SC-22-017 Apr 19, 2022 · Service Bulletin/Repair Instructions
    Service Bulletin for select transit buses to incorporate an overlay harness bus buses with high CAN noise.
  • SC-22-027 Mar 3, 2022 · Service Bulletin/Repair Instructions
    Bulletin Instruction for upgrading the body and vehicle controllers software on transit buses. Update to fault thresholds and additional parameters added from customer requests.
  • SC-22-044 Aug 8, 2023 · Service Bulletin/Repair Instructions
    Bulletin instructions for rotating the ambient temp sensor 180deg on transit buses to reduce road debris from accumulating on the temp sensor.
  • SC-22-058 Jun 1, 2022 · Service Bulletin/Repair Instructions
    Bulletin to update Transit bus body controllers for improved diagnostics and two new parameters to accommodate customer requests.
  • SC-22-073 Jun 28, 2022 · Service Bulletin/Repair Instructions
    Bulletin Instructions to switch out stanchion fittings that attach the vertical rails to ceiling system on transit buses.
  • SC-22-078 Jul 5, 2022 · Service Bulletin/Repair Instructions
    Instructions updating the Powertrain Controller on select Transit buses for improved powertrain performance.
  • SC-22-079 Jul 5, 2022 · Service Bulletin/Repair Instructions
    Instructions for a vehicle controller update on the transit buses to fix bugs and protect components, specifically overhead charging, compressor and inverter. Improving diagnostics of these units.
  • SC-22-084 Sep 28, 2022 · Service Bulletin/Repair Instructions
    Service Bulletin Instructions for battery ancillary bay to add an external ground strap to the battery pack.
  • SC-22-085 Jul 19, 2022 · Service Bulletin/Repair Instructions
    Service Bulletin Instructions to update the vehicle controller software, bug fixes ands improvements to the vehicle.
  • SC-22-088 Sep 27, 2022 · Service Bulletin/Repair Instructions
    Replacement connectors and upgraded heat shrink to prevent UV damage to the wiring.
  • SC-22-094 Aug 17, 2022 · Service Bulletin/Repair Instructions
    This Procedure describes the addition of a fitting to the fire suppression system to better secure the discharge hose.
  • SC-22-097 Oct 22, 2022 · Service Bulletin/Repair Instructions
    Repair instructions for ADA ramp brackets that have come debonded due to water intrusion.
  • SC-22-150 Apr 4, 2023 · Service Bulletin/Repair Instructions
    Bulletin to add shim under the steering TLP due to build variances of the bodies and bond gaps.
  • SC-23-054 Dec 11, 2023 · Service Bulletin/Repair Instructions
    Relocation of the air compressors intake as well as adding a preliminary filter at the top of the air intake.
  • SC-23-055 Jul 11, 2023 · Service Bulletin/Repair Instructions
    Relocation of the air compressors intake as well as adding a preliminary filter at the top of the air intake..
  • SC-23-062 Nov 27, 2023 · Service Bulletin/Repair Instructions
    The procedure describes the process of updating the Customer CAN Gateway to improve data retrieval on specific customer ITS equipment on ZX5 vehicles.
  • SC-23-082 Nov 18, 2023 · Service Bulletin/Repair Instructions
    This procedure adds improved caps to the coolant system for 800V buses.
  • SC-23-121 Aug 23, 2023 · Service Bulletin/Repair Instructions
    This procedure describes the process for updating the Vehicle and Body Controller software to the latest version on 800v RR Prodrive buses.
  • SC-23-135 Oct 14, 2023 · Service Bulletin/Repair Instructions
    This procedure describes the process for updating the 800VRR Prodrive Vehicle, Powertrain, Body Controller, ESM and Charge Controller software to BuSCoM 2.0.
  • SC-24-009 May 16, 2024 · Service Bulletin/Repair Instructions
    Software update for the 800vRRs Vehicle and Body Software to reduce the radiator fan current draw to 80%. Additionally corrects a bug to properly route ESM faults away from the coolant light icon.
  • SC-23-176 Jan 23, 2024 · Service Bulletin/Repair Instructions
    BMS software update to the latest version. It improves current sensors performance and adjusts the isolation fault threshold value.
Source: NHTSA manufacturer communications files.
About service bulletins