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Service bulletin TIB-43-031

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 id10052560
Published by NHTSA2013-08-16
Manufacturer's numberTIB-43-031
Manufacturer's date2013-06-17
NHTSA componentENGINE AND ENGINE COOLING:EXHAUST SYSTEM

NHTSA's summary

KENWORTH: SEE DOCUMENT SEARCH BUTTON SEARCH BUTTON FOR OWNER LETTER. DUE TO DEF DOSER NOT RESPONDING OR IS OUT OF FAULT ADJUSTMENT, THE COOLANT LINES (CROSSOVER EXHAUSTS) ARE ROUTED INCORRECTLY, IN SOME CHASSIS, AND MAY CAUSE ERROR CODES (P3859, P3569). NO MODELS OR MODEL YEARS LISTED. *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, Exhaust and emissions

Trouble codes named

P3569, P3859

Vehicles listed
KENWORTH KENWORTH

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