# Service bulletin C2550

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: 10253764
- Published by NHTSA: 2024\-05\-01
- Manufacturer's number: C2550
- Manufacturer's date: 2024\-04\-18
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

This campaign is being issued to recalibrate the Engine Control Module \(ECM\) and update the ECM Code on certain MY2013 \- 2016 ISL9 engines in True Series Hybrid bus applications with BAE Transmission systems. This campaign enables authorized repair locations to update the ECM Code and calibrate the engine control modules 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-10253764-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-10253764-9999.pdf)

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

## Components

Engine

## Vehicles listed

- CUMMINS ISL 9

JSON: [/v1/bulletins/10253764](/v1/bulletins/10253764)

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