# Service bulletin SC\-20\-138

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: 11013829
- Published by NHTSA: 2025\-02\-06
- Manufacturer's number: SC\-20\-138
- Manufacturer's date: 2021\-05\-20
- Campaign id or software version: SC\-20\-138
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

Transit bus HVAC software upgrade to improve performance of the Eberspaecher unit.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-11013829-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-11013829-9999.pdf)

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

## Components

Electrical system

## Vehicles listed

- 2018 to 2019 PROTERRA CATALYST

JSON: [/v1/bulletins/11013829](/v1/bulletins/11013829)

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