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Service bulletin D23M1REV

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 id10246188
Published by NHTSA2023-12-07
Manufacturer's numberD23M1REV
Manufacturer's date2023-11-30
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

Revised Detroit Field Service Campaign for Drilled Exhaust Rocker Arm Installation. REVSION: Parts disposition is now SCRAP. Please follow normal part return procedures.

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
DETROIT DIESEL DETROIT DIESEL

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