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Service bulletin sb4256

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 id10141731
Published by NHTSA2018-06-18
Manufacturer's numbersb4256
Manufacturer's date2018-02-26
NHTSA componentENGINE AND ENGINE COOLING:EXHAUST SYSTEM; EXTERIOR LIGHTING:BRAKE LIGHTS; EQUIPMENT

NHTSA's summary

sb4256 Enabling M2 Exhaust Brake Lights

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, Exhaust and emissions, Lighting, Brake lights

Vehicles listed
FREIGHTLINER BUSINESS CLASS M22008 to 2019
FREIGHTLINER BUSINESS CLASS M2 106V2005 to 2007
FREIGHTLINER CENTURY CLASS2002 to 2004

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