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Service bulletin 231000

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 id617234
Published by NHTSA2001-03-14
Manufacturer's number231000
Manufacturer's date2000-10-23
NHTSA componentENGINE AND ENGINE COOLING:ENGINE

NHTSA's summary

INFORMATION PERTAINING TO THE WINTER COVER FOR THE ALL-NEW 6.6 DURAMAX DIESEL ENGINE. *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
CHEVROLET CHEVROLET TRUCK
GMC GMC

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