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Service bulletin TB EN-49 Rev

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 id10116859
Published by NHTSA2017-08-31
Manufacturer's numberTB EN-49 Rev
Manufacturer's date2016-07-22
NHTSA componentENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE

NHTSA's summary

To advise dealers there are two AHI Manifolds available. Installation of the incorrect AHI Manifold may result in subsequent failure and progressive damage to the SCR assembly.

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

Engine, Exhaust and emissions, Exhaust manifold, pipes and muffler

Vehicles listed
UD TRUCKS UD TRUCKS

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