# Service bulletin TSB180047\-041320

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: 10136558
- Published by NHTSA: 2018\-05\-14
- Manufacturer's number: TSB180047\-041320
- Manufacturer's date: 2018\-04\-18
- NHTSA component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM

## NHTSA's summary

This Technical Service Bulletin describes the verfication and resolution of Diesel exhaust fluid \(DEF\) dosing unit heater elements becoming discolored caused by chemical reactions between DEF and the aluminum housing. Also the DEF dosing valve inlet screen can become plugged with debris when corrosion on the DEF dosing unit heating element flakes off typically leading to FC1682, FC3574, and/or FC3596.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10136558-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10136558-0001.pdf)

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

## Components

Engine, Exhaust and emissions

## Vehicles listed

- CUMMINS B6.7
- CUMMINS CUMMINS
- CUMMINS L9

JSON: [/v1/bulletins/10136558](/v1/bulletins/10136558)

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