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Message: <blockquote data-quote="AuroraGirl" data-source="post: 28702" data-attributes="member: 9417">canbus is not 2003, canbus Canbus is 2001 starting in duramax trucks for engine uses, then in 2006-7 they had Canbus expand to correlate the cluster and the BCM iirc for one of the Duramax engine options iirc.  The other trucks just dont have it.  so for example, my 2005 has no canbusThe gmt400 in the later years has class 2... only in minor specific spots.</blockquote>