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Service bulletin TIB-E-056

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 id10044285
Published by NHTSA2012-06-05
Manufacturer's numberTIB-E-056
Manufacturer's date2012-05-17
NHTSA componentENGINE

NHTSA's summary

KENWORTH (PACCAR): ENGINE SOFTWARE UPDATE REQUIRED FOR INSTALLATION OF HC DOSER SHIELDS AND/OR EGR CLEANING FOR CHASSIS. *PE

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
KENWORTH T6602010 to 2012
KENWORTH T7002010 to 2012
KENWORTH T8002010 to 2012
KENWORTH W9002010 to 2012

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