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Service bulletin TSB101120-043020

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 id10193399
Published by NHTSA2021-05-17
Manufacturer's numberTSB101120-043020
Manufacturer's date2021-04-30
NHTSA componentEQUIPMENT

NHTSA's summary

This Technical Service Bulletin describes the verification and resolution of engine surge, usually with high counts of Fault Codes 1861, 2776 and/or 3847. The cause is found to be contamination of the air/fuel mixer and partial or complete blockage of the mixer's fuel ports. 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 ISB5.9 G
CUMMINS WESTPORT ISL G
CUMMINS WESTPORT ISX12 G

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