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U1000 Diagnostic Trouble Code Discussion for March 2013

Class 2 Communication Malfunction


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Trouble Ticket Help Requests for DTC U1000
Help Request Posted
2006 GMC Sierra 2500 HD SLT 6.6L Stall VIN: 1GTHK23D26
U1000: Class 2 Communication Malfunction. ... the BCM after a very competent shop replaced it. The programming went perfect until I tried to do the 10 minute VATS relearn TIS 2 Web, this is where I got the generic error message, "check connections, don't replace the module yet..." After severa...
March 02, 2013
2003 Chevrolet Silverado 1500 5.3L No Start VIN: 1GCEK13T13
U1000: loss of class 2. ... engagement in transmission, repaired transmission, attempted flash of VCM to update calibrations for fuel system and transmission control system. The rig I was using was a tried and true setup that I have used many times for GM vehicles consisting of Snap ...
March 08, 2013
2003 Chevrolet Silverado 1500 5.3L No Start VIN: 1GCEK13T13
U1000: loss of class 2. ... engagement in transmission, repaired transmission, attempted flash of VCM to update calibrations for fuel system and transmission control system. The rig I was using was a tried and true setup that I have used many times for GM vehicles consisting of Snap ...
March 09, 2013
2006 GMC Sierra 2500 HD SLT 6.6L Stall VIN: 1GTHK23D26
U1000: Class 2 Communication Malfunction. ... the BCM after a very competent shop replaced it. The programming went perfect until I tried to do the 10 minute VATS relearn TIS 2 Web, this is where I got the generic error message, "check connections, don't replace the module yet..." After severa...
March 02, 2013
2003 Chevrolet Silverado 1500 5.3L No Start VIN: 1GCEK13T13
U1000: loss of class 2. ... engagement in transmission, repaired transmission, attempted flash of VCM to update calibrations for fuel system and transmission control system. The rig I was using was a tried and true setup that I have used many times for GM vehicles consisting of Snap ...
March 08, 2013
2003 Chevrolet Silverado 1500 5.3L No Start VIN: 1GCEK13T13
U1000: loss of class 2. ... engagement in transmission, repaired transmission, attempted flash of VCM to update calibrations for fuel system and transmission control system. The rig I was using was a tried and true setup that I have used many times for GM vehicles consisting of Snap ...
March 09, 2013