# Service bulletin SC\-21\-056

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: 11013580
- Published by NHTSA: 2025\-02\-04
- Manufacturer's number: SC\-21\-056
- Manufacturer's date: 2021\-05\-20
- Campaign id or software version: SC\-21\-056
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-11013580-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-11013580-9999.pdf)

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

## Components

Electrical system

## Vehicles listed

- 2017 to 2021 PROTERRA CATALYST
- 2019 to 2022 PROTERRA ZX5

JSON: [/v1/bulletins/11013580](/v1/bulletins/11013580)

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