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U1000 Diagnostic Trouble Code Discussion for June 2004

Class 2 Communication Malfunction

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Trouble Ticket Help Requests for DTC U1000
Help Request Posted
2002 Chevrolet Trailblazer LS 4.2L No Start VIN: 1GNDT13552
U1000: Communication problem between modules. Heres the story.First vehicle came in with no tranny shifting(in default).Pulled codes found 5.Checked ATN Historys found common ignition switch problem. So I replaced switch and now codes are gone but now will not turn over or start And has no codes in ecm bu...
June 08, 2004