# Service bulletin TSB543A

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: 10125502
- Published by NHTSA: 2017\-12\-14
- Manufacturer's number: TSB543A
- Manufacturer's date: 2017\-02\-01
- NHTSA component: ELECTRICAL SYSTEM:SOFTWARE

## NHTSA's summary

Updated firmware has been released for the APU and DCP for APU's with serial number ETD22220943 or after. Follow the instructions in TSB\-543 when replacing a DPC or APU controller as the replacement controller may require a firmware update.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2017/MC-10125502-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2017/MC-10125502-0001.pdf)

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

## Components

Electrical system, Software

## Vehicles listed

- CARRIER TRANSICOLD CARRIER TRANSICOLD

JSON: [/v1/bulletins/10125502](/v1/bulletins/10125502)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20TSB543A&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10125502&vehicle=Service%20bulletin%20TSB543A)