# Service bulletin SB\_406.12

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: 10240751
- Published by NHTSA: 2023\-08\-17
- Manufacturer's number: SB\_406.12
- Manufacturer's date: 2023\-07\-21
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

Identify options for dealing with multiple failure mode codes on various versions of DEF headers for 2016 and newer Cummins engines. This latest revision is to address production and service change from optical header 3539748 to ultrasonic header 3584091.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10240751-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10240751-9999.pdf)

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

## Components

Engine

## Vehicles listed

- CUMMINS CUMMINS

JSON: [/v1/bulletins/10240751](/v1/bulletins/10240751)

[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%20SB_406.12&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10240751&vehicle=Service%20bulletin%20SB_406.12)