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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
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