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Service bulletin C2052D

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 id10170327
Published by NHTSA2020-01-21
Manufacturer's numberC2052D
Manufacturer's date2019-12-10
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

This field action authorizes certified repair locations to upfit certain ISX15 CM2250 engines rated at 525hp-600hp and All ISX12 CM2250 engines (regardless of HP Rating) with an improved Selective Catalytic Reduction (SCR) Catalyst. 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

Engine

Vehicles listed
CUMMINS ISX12
CUMMINS ISX15

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