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Service bulletin TT7606EN

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10156796
Published by NHTSA2019-04-08
Manufacturer's numberTT7606EN
Manufacturer's date2015-02-01
NHTSA componentPOWER TRAIN; EQUIPMENT ADAPTIVE/MOBILITY

NHTSA's summary

Tech Tip explaining that certain TCMs may be mounted in a location that does not conform to specifications

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Equipment and accessories, Transmission and driveline

Vehicles listed
ALLISON 3000 SERIES TRANSMISSION
ALLISON 4000 SERIES TRANSMISSION

Listing a model year does not mean every vehicle of it is concerned: the document says which.