# Service bulletin TT7401EN

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: 10155489
- Published by NHTSA: 2019\-04\-01
- Manufacturer's number: TT7401EN
- Manufacturer's date: 2013\-10\-07
- NHTSA component: POWER TRAIN; ENGINE

## NHTSA's summary

Tech Tip concerning 2013 Cummins ISX12 Causing DTC P2641 in Low Reverse with 5th Generation 4700/4800 Transmission

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2013/MC-10155489-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2013/MC-10155489-9999.pdf)

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

## Components

Engine, Transmission and driveline

## Trouble codes named

P2641

## Vehicles listed

- ALLISON 4000 SERIES TRANSMISSION

JSON: [/v1/bulletins/10155489](/v1/bulletins/10155489)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20TT7401EN&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10155489&vehicle=Service%20bulletin%20TT7401EN)