# Service bulletin T2549

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: 10224319
- Published by NHTSA: 2022\-10\-17
- Manufacturer's number: T2549
- Manufacturer's date: 2022\-09\-22
- NHTSA component: POWER TRAIN

## NHTSA's summary

This Temporary Repair Practice is being issued to address failures related to fault codes 124 and/or 3342 on certain L9 CM2350 Hybrid Bus engines with Allison Transmission Systems only. This TRP authorizes certified repair locations to repair failures due to the listed fault codes where troubleshooting leads to a confirmed failure of the components related to the listed fault codes.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10224319-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10224319-9999.pdf)

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

## Components

Transmission and driveline

## Vehicles listed

- ALLISON TRANSMISSION
- CUMMINS L9

JSON: [/v1/bulletins/10224319](/v1/bulletins/10224319)

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