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Service bulletin C2053D

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 id10190742
Published by NHTSA2021-04-26
Manufacturer's numberC2053D
Manufacturer's date2021-03-11
NHTSA componentEQUIPMENT

NHTSA's summary

This field action authorizes certified repair locations to upfit certain ISX12 CM2350 engines with an improved Selective Catalytic Reduction (SCR) Catalyst. For the MY2013 engines, a calibration update will be required. This is an update to a 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

Equipment and accessories

Vehicles listed
CUMMINS ISX12

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