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Service bulletin T1612D

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 id10086598
Published by NHTSA2016-12-19
Manufacturer's numberT1612D
Manufacturer's date2016-03-14
NHTSA componentENGINE; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE)

NHTSA's summary

THIS TEMPORARY REPAIR PRACTICE IS BEING ISSUED TO ADDRESS PLUGGING OF THE EGR COOLERS AND EGR VALVES RESULTING IN FC1896 AND/OR FC3382 ON ISL9 CM2350 TRANSIT BUS APPLICATIONS. THIS TRP AUTHORIZES THE REPLACEMENT OF PISTONS AND VALVE STEM SEALS, AND IF REQUIRED, UPDATING THE ECM CALIBRATION. THIS IS A AN UPDATE TO A PREVIOUSLY RELEASED COMMUNICATION.

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, Exhaust and emissions, EGR valve

Vehicles listed
CUMMINS ISL9

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