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Service bulletin C2746

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 id10252399
Published by NHTSA2024-04-02
Manufacturer's numberC2746
Manufacturer's date2024-03-07
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

This Emissions Campaign enables authorized repair locations to install new DEF header and recalibrate the ECM on certain engines where appropriate. The DEF header calibrations on eligible units will be obsoleted and superseded back to the original calibration, at the latest revision level.

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
CUMMINS ISX
CUMMINS ISX15

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