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Service bulletin 98T1937

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 id603501
Published by NHTSA1999-02-23
Manufacturer's number98T1937
Manufacturer's date1998-09-01
NHTSA componentENGINE AND ENGINE COOLING:ENGINE

NHTSA's summary

SUBJECT ON SIGNATURE AND ISM FAULT CODE UPDATES. *YC

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine

Vehicles listed
CUMMINS ISM
CUMMINS ISX

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