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Service bulletin TSB210187-032020

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 id10233702
Published by NHTSA2023-04-05
Manufacturer's numberTSB210187-032020
Manufacturer's date2023-03-20
NHTSA componentENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM

NHTSA's summary

This Technical Service Bulletin describes the verification and resolution of the issue of combination of one or all DEF header fault code(s) 3868, 4572 and/or 4677 getting logged. This is an update to the previously submitted communication.

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, Exhaust and emissions

Vehicles listed
CUMMINS ISB6.7
CUMMINS ISL 9
CUMMINS ISX12
CUMMINS ISX15
CUMMINS L9
CUMMINS X12
CUMMINS X15

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