# Service bulletin TSB210187

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: 10238655
- Published by NHTSA: 2023\-07\-05
- Manufacturer's number: TSB210187
- Manufacturer's date: 2023\-06\-16
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

This Technical Service Bulletin describes the verification and resolution of issue of Fault Codes 3868, 4572 and 4677 Caused by Diesel Exhaust Fluid \(DEF\) Header Malfunction. This is an update to the previously submitted communication.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10238655-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10238655-9999.pdf)

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

## Components

Engine

## Vehicles listed

- CUMMINS B6.7
- CUMMINS ISB6.7
- CUMMINS ISL 9
- CUMMINS ISX12
- CUMMINS ISX15
- CUMMINS L9
- CUMMINS X12
- CUMMINS X15

JSON: [/v1/bulletins/10238655](/v1/bulletins/10238655)

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