# Service bulletin SC\-21\-002

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11013673
- Published by NHTSA: 2025\-02\-05
- Manufacturer's number: SC\-21\-002
- Manufacturer's date: 2021\-01\-27
- Campaign id or software version: SC\-21\-002
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

Transit bus hvac software update as the vendor found a bug inwhich the heater could run with out running the fan tripping the heating safety switch fault.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-11013673-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-11013673-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system

## Vehicles listed

- 2019 to 2020 PROTERRA CATALYST
- 2019 to 2020 PROTERRA ZX5

JSON: [/v1/bulletins/11013673](/v1/bulletins/11013673)

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