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Service bulletin D21R5

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 id10189349
Published by NHTSA2021-03-31
Manufacturer's numberD21R5
Manufacturer's date2021-03-05
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

Detroit Emission Recall for Certain Detroit DD5 quick launch engines that are registered in the state of California will require reprogramming to a minimum of the MCM and ACM software versions.

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
FREIGHTLINER BUSINESS CLASS M22017 to 2019

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