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Service bulletin D20M1

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 id10172743
Published by NHTSA2020-03-25
Manufacturer's numberD20M1
Manufacturer's date2020-03-25
NHTSA componentENGINE; ELECTRICAL SYSTEM:SOFTWARE

NHTSA's summary

DDC Field Service Campaign for GHG14 DETROIT DD13 with Two-Box Aftertreatment Software Reprogramming.Certain Detroit Model Year 2013 to 2015 GHG14 DD13 engines that are registered in California will require reprogramming to a minimum of the MCM software version and fuel map version listed below: MCM Software Version 4.7.0.0 ZGS 005

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, Engine, Software

Vehicles listed
DETROIT DIESEL DD13

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