# Service bulletin SC\-20\-147

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: 11013823
- Published by NHTSA: 2025\-02\-06
- Manufacturer's number: SC\-20\-147
- Manufacturer's date: 2020\-10\-21
- Campaign id or software version: SC\-20\-147
- NHTSA component: POWER TRAIN; ELECTRICAL SYSTEM

## NHTSA's summary

Transit bus software update to support the quarterly cadence of software upgrades. This release updates a timer to the drivers seat to reduce false alarms of no driver in the seat over bouncy roads, mapped new output for horn relay. For the vehicle controller fixed issue around the ambient and coolant temp sensor. And many other fixes seen in the documentation

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-11013823-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-11013823-9999.pdf)

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

## Components

Electrical system, Transmission and driveline

## Vehicles listed

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

JSON: [/v1/bulletins/11013823](/v1/bulletins/11013823)

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