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Service bulletin C2223A

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 id10170441
Published by NHTSA2020-01-21
Manufacturer's numberC2223A
Manufacturer's date2019-12-03
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

This field action is being issued to address potential concerns with coolant level sensors installed in certain L9 CM2350 L123B and B6.7 CM2350 B121B MY17 and MY18 engines. This Campaign authorizes certified repair locations to replace the coolant level sensors. 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 B6.7
CUMMINS L9

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