# Service bulletin TSB170054

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: 11037033
- Published by NHTSA: 2026\-09\-04
- Manufacturer's number: TSB170054
- Manufacturer's date: 2026\-08\-10
- NHTSA component: ENGINE

## NHTSA's summary

This Technical Service Bulletin describes the verification and resolution of fault codes caused by an aftertreatment diesel exhaust fluid \(DEF\) tank heater coolant control valve that is not closing completely. This is an update to a previously submitted communication.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037033-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037033-9999.pdf)

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

## Components

Engine

## Vehicles listed

- CUMMINS B6.7
- CUMMINS ISB6.7
- CUMMINS ISL9
- CUMMINS ISX12
- CUMMINS ISX15
- CUMMINS L9
- CUMMINS X12
- CUMMINS X15

JSON: [/v1/bulletins/11037033](/v1/bulletins/11037033)

[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%20TSB170054&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11037033&vehicle=Service%20bulletin%20TSB170054)