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Service bulletin ATC1685

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 id10086002
Published by NHTSA2016-12-13
Manufacturer's numberATC1685
Manufacturer's date2015-07-21
NHTSA componentENGINE

NHTSA's summary

THIS ACCOUNT TEAM COVERAGE ADDRESSES CERTAIN ENGINES THA HAVE EXPERIENCED INTERNALLY LEAKING DEF PUMPS CAUSED BY FREEZING DEF DUE TO INCOMPLETE PURGES ON SHUT DOWN. CERTIFIED REPAIR LOCATIONS ARE AUTHORIZED TO REPLACE THE BACK FLOW CONNECTOR ON BOSCH DENOX 2.2 SUPPLY MODULES. REPLACEMENT OF THE CONNECTOR WILL IMPROVE POST SHUT DOWN PURGE EFFECTIVENESS.

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 ISB6.7
CUMMINS ISL9
CUMMINS ISX12
CUMMINS ISX15

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