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Service bulletin 054A

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 id10018788
Published by NHTSA2006-01-17
Manufacturer's number054A
Manufacturer's date2005-11-08
NHTSA componentENGINE AND ENGINE COOLING:ENGINE:DIESEL

NHTSA's summary

CAMPAIGN 05C-4A - DETROIT DIESEL CORPORATION (DDC) HAS DETERMINED THAT CERTAIN 2003 THROUGH 2004 MODEL YEAR 275 BHP RATED SERIES 50 URBAN BUS ENGINES EQUIPPED WITH DIESEL PARTICULATE FILTERS WILL REQUIRE REPLACEMENT OF THE FILTER. DETROIT DIESEL. *TT

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
DETROIT DIESEL SERIES 502003 to 2004

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