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Service bulletin 139

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 id10019746
Published by NHTSA2006-04-25
Manufacturer's number139
Manufacturer's date2006-03-21
Replaces139R
NHTSA componentENGINE AND ENGINE COOLING:ENGINE

NHTSA's summary

GS500F ENGINE KNOCK AT IDLE / A MILD BUT ANNOYING KNOCKING NOISE FROM THE CYLINDER HEAD AREA. *AK

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
SUZUKI GS5001994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
SUZUKI GS5002004, 2005
SUZUKI GS500F2006 (the catalog's model; the bulletin names a series or trim of it)

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