# Service bulletin TT7478EN

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: 10156685
- Published by NHTSA: 2019\-04\-08
- Manufacturer's number: TT7478EN
- Manufacturer's date: 2014\-04\-25
- NHTSA component: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; POWER TRAIN

## NHTSA's summary

Tech Tip concerning Navistar Required 5th Gen Transmission Control Module \(TCM\) Reprogram to address a low power/poor performance concern

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2014/MC-10156685-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2014/MC-10156685-9999.pdf)

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

## Components

Equipment and accessories, Labels and manuals, Transmission and driveline

## Vehicles listed

- ALLISON 2000 SERIES TRANSMISSION

JSON: [/v1/bulletins/10156685](/v1/bulletins/10156685)

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