# Service bulletin Cummins 9L Gas

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: 10134778
- Published by NHTSA: 2018\-04\-23
- Manufacturer's number: Cummins 9L Gas
- Manufacturer's date: 2018\-03\-08
- NHTSA component: ENGINE

## NHTSA's summary

Mack Trucks has identified a condition with 2018 L9N Cummins Westport, Inc. \(CWI\) natural gas engines when installed in a bare Mack chassis which may cause an increase in engine speed when the truck decelerates close to idle speed.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10134778-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10134778-0001.pdf)

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

## Components

Engine

## Vehicles listed

- MACK MACK

JSON: [/v1/bulletins/10134778](/v1/bulletins/10134778)

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