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Message: <blockquote data-quote="ORVietVet" data-source="post: 26355" data-attributes="member: 9438">Codes found, U1026-Lost class 2 communications.U1000-Class 2 data link malfunction.C0550-ECU malfunctionThen found at GMTNation Forum, that the TrailBlazer TCCM-Transfer Case Control Module that was installed in all the 2002 TB's typically do fail. The problem was corrected in 2003 and newer TB's. I bought a 2003 TCCM from a seller at ebay and he is programming it to match with the 2002 TB and I will install and should be fixed.</blockquote>