# Service bulletin TT\-7539EN

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: 10058997
- Published by NHTSA: 2016\-01\-09
- Manufacturer's number: TT\-7539EN
- Manufacturer's date: 2014\-09\-01
- NHTSA component: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ELECTRICAL SYSTEM:SOFTWARE

## NHTSA's summary

ALLISON TRANSMISSION: ON SOME TRUCKS CHASSIS, THE CALIBRATION SETTING FOR 5TH GENERATION CONTROLS LOAD BASED SHIFT SCHEDULING \(LBSS\) IS INCORRECT AND CAUSES POOR DRIVING PERFORMANCE. \*PE

## The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

## Components

Electrical system, Transmission and driveline, Automatic transmission, Software, Transmission control module

## Vehicles listed

- ALLISON TRANSMISSION

JSON: [/v1/bulletins/10058997](/v1/bulletins/10058997)

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