# Service bulletin TSB110181\-012720

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: 10171583
- Published by NHTSA: 2020\-02\-24
- Manufacturer's number: TSB110181\-012720
- Manufacturer's date: 2020\-01\-27
- NHTSA component: EQUIPMENT ADAPTIVE/MOBILITY; ENGINE

## NHTSA's summary

This Technical Service Bulletin describes the verification and resolution of engine speed instability related to truck vacuum blower or pump engagement. Some units with transfer cases have exhibited engine speed instability when the vacuum blower or pump is engaged. New engine control module software can address most of these issues. This is an update to a previously submitted communication.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10171583-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10171583-9999.pdf)

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

## Components

Engine, Equipment and accessories

## Vehicles listed

- CUMMINS ISX12
- CUMMINS ISX15
- CUMMINS L9
- CUMMINS L9N
- CUMMINS X12

JSON: [/v1/bulletins/10171583](/v1/bulletins/10171583)

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