# Service bulletin T7276

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: 11037914
- Published by NHTSA: 2026\-10\-05
- Manufacturer's number: T7276
- Manufacturer's date: 2026\-09\-25
- NHTSA component: ENGINE

## NHTSA's summary

This Temporary Repair Practice is being issued to recalibrate the engine control module \(ECM\) on certain B6.7, L9, X12 and X15 engines that have fault codes 3749 and/or 6463 that cannot be cleared with a service tool. This field action authorizes certified service locations to update the ECM calibration.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037914-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037914-9999.pdf)

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

## Components

Engine

## Vehicles listed

- CUMMINS B6.7
- CUMMINS L9
- CUMMINS X12
- CUMMINS X15

JSON: [/v1/bulletins/11037914](/v1/bulletins/11037914)

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