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Service bulletin SC-11150

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 id10040504
Published by NHTSA2011-08-31
Manufacturer's numberSC-11150
Manufacturer's date2011-07-01
NHTSA componentENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE

NHTSA's summary

GM SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. 2008-2009 TRAILBLAZER/ENVOY. THE VEHICLES MAY DEVELOP A CRACK IN THE EXHAUST MANIFOLD. IT COULD RESULT IN INCREASED EXHAUST NOISE. *RM

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, Exhaust manifold, pipes and muffler

Vehicles listed
CHEVROLET TRAILBLAZER2008, 2009
GMC ENVOY2008, 2009

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