# Service bulletin TSB 491

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: 10121938
- Published by NHTSA: 2017\-11\-03
- Manufacturer's number: TSB 491
- Manufacturer's date: 2017\-09\-28
- NHTSA component: ENGINE; ELECTRICAL SYSTEM

## NHTSA's summary

SilverLeaf has determined that, in some cases, the TM102 Coach Management module \(between version 3.38 and 3.42\) may not communicate with the engine computer using the 500k baud rate. In response, Newmar has issued TSB 491. Issue: During coach startup, the TM102 Coach Management module may crash the 500k data bus.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2017/MC-10121938-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2017/MC-10121938-0001.pdf)

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

## Components

Electrical system, Engine

## Vehicles listed

- 2017 to 2018 NEWMAR ESSEX
- 2017 to 2018 NEWMAR KING AIRE
- 2017 to 2018 NEWMAR LONDON AIRE
- 2017 to 2018 NEWMAR MOUNTAIN AIRE

JSON: [/v1/bulletins/10121938](/v1/bulletins/10121938)

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