# Service bulletin TSB260079

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: 11034595
- Published by NHTSA: 2026\-07\-07
- Manufacturer's number: TSB260079
- Manufacturer's date: 2026\-06\-23
- NHTSA component: ENGINE

## NHTSA's summary

This Technical Service Bulletin describes the verification and resolution steps for the fault code hander within the Guidanz Diagnostic Took Kit \(DTK\) which may stop working after downloading a new calibration and may either continue to display any fault codes that were present \(both active and inactive\) before the download or fail to display any new fault codes that get triggered after the calibration download, resulting in inactive fault codes remaining even after downloading a new calibration.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11034595-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11034595-9999.pdf)

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

## Components

Engine

## Vehicles listed

- CUMMINS B6.7O

JSON: [/v1/bulletins/11034595](/v1/bulletins/11034595)

[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%20TSB260079&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11034595&vehicle=Service%20bulletin%20TSB260079)