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Service bulletin 99009

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 id606540
Published by NHTSA1999-08-26
Manufacturer's number99009
Manufacturer's date1999-04-30
NHTSA componentENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE)

NHTSA's summary

VOLUNTARY EMISSION CAMPAIGN REGARDING VEHICLES BUILT WITH THE WRONG EXHAUST GAS RECIRCULATION VALVE. *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, Exhaust and emissions, EGR valve

Vehicles listed
CHEVROLET SILVERADO1999
GMC SIERRA1999

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

Other bulletins for the same vehicles and component
990091999-08-26. Service bulletin. SUBJECT REGARDING EXHAUST GAS RECIRCULATION VALVE (EGR) MISBUILDS. *TT
991091999-08-02. Service bulletin. RECALL CAMPAIGN REGARDING EXHAUST GAS RECIRCULATION VALVE MISBUILDS. *TT
990091999-05-18. Service bulletin. VOLUNTARY EMISSION CAMPAIGN INVOLVING VEHICLES WITH A MISBUILT EXHAUST GAS RECIRCULATION VALVE. *TT