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Service bulletin ATC2672

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 id10233690
Published by NHTSA2023-04-04
Manufacturer's numberATC2672
Manufacturer's date2023-03-09
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

"This field action is being issued to recalibrate the Engine Control Module (ECM) on certain X12 certified engines. A software error may lead to the engine instability issues at specific operation modes causing Engine Speed at Idle fault codes being triggered. This field action enables authorized repair locations to update the ECM calibration to the latest revision that resolves the condition described above."

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

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