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Service bulletin FSB.0023

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 id10227631
Published by NHTSA2022-12-12
Manufacturer's numberFSB.0023
Manufacturer's date2022-11-02
NHTSA componentFUEL SYSTEM, GASOLINE; ELECTRICAL SYSTEM

NHTSA's summary

Instructed users of Peterbilt 520 vehicles equipped with Hexagon® Agility® compressed natural gas (CNG) fuel systems that the secondary ignition switch used for service purposes is not integrated with the Blue iQ? system and cannot be used for vehicle operation and troubleshooting.

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

Electrical system, Fuel system

Vehicles listed
AGILITY FUEL SYSTEMS AGILITY FUEL SYSTEMS

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