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Service bulletin WI21-012

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 id10191048
Published by NHTSA2021-05-01
Manufacturer's numberWI21-012
Manufacturer's date2021-04-26
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

Warranty Information Letter for Detroit Parts Return Guidelines. Service locations are requested to review the letter's notes to ensure onsite parts management practices match to ease the return process for the service.

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

Vehicles listed
FCCC FCCC
FREIGHTLINER FREIGHTLINER
STERLING STERLING
THOMAS BUILT BUSES THOMAS BUILT BUSES
WESTERN STAR WESTERN STAR

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