# Service bulletin C2690

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: 10249561
- Published by NHTSA: 2024\-02\-02
- Manufacturer's number: C2690
- Manufacturer's date: 2024\-01\-30
- NHTSA component: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE; ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\)

## NHTSA's summary

This emission campaign is being issued to recalibrate the Engine Control Module \(ECM\) on certain 2021 B6.7 Hybrid bus engines. The campaign enables authorized repair locations to calibrate the engine control module \(ECM\) to the latest revision. This calibration update may provide improvements to the monitoring frequency of certain on\-board diagnostics in order to meet the in\-use monitor performance ratio \(IUMPR\) requirements.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-10249561-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-10249561-9999.pdf)

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

## Components

Engine, Engine control module

## Vehicles listed

- CUMMINS B6.7

JSON: [/v1/bulletins/10249561](/v1/bulletins/10249561)

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