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U1000 Diagnostic Trouble Code Discussion for March 2007

Class 2 Communication Malfunction


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Trouble Ticket Help Requests for DTC U1000
Help Request Posted
2001 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J91
U1000: Class 2 Communication Malfunction. ... pressure switch short out the bus line and not start the vehicle.The vehicle returned after we repaired the fuel pump for a no start condition on Jan. 24. found fuel pump bad and replaced. Customer has returned vehicle and still complaines of sometime not ...
March 01, 2007
2000 Oldsmobile Silhouette GLS 3.4L No Start VIN: 1GHDX03E8Y
U1000: Class 2 communication malfunction. ... unplugged modules on data line to see if one was shorting. Cannot communicate with theft detterant system. Retrieve code from PCM - U1000 and P1626 - run test for P1626 - replace PCM - no difference - check ohms and voltage from PCM to BCM and to starter r...
March 15, 2007