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Service bulletin TT7674EN

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 id10156694
Published by NHTSA2019-04-08
Manufacturer's numberTT7674EN
Manufacturer's date2015-06-10
NHTSA componentEQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ENGINE AND ENGINE COOLING

NHTSA's summary

Tech Tip concerning Potential Loss of Throttle Response on Specific MCI Coaches

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

Engine, Equipment and accessories, Labels and manuals

Vehicles listed
ALLISON B SERIES

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