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U1000 Diagnostic Trouble Code Discussion for September 2015

Class 2 Communication Malfunction


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Trouble Ticket Help Requests for DTC U1000
Help Request Posted
2001 Buick Park Avenue 3.8L No Start VIN: 1G4CW54K11
U1000: Class 2 Communication Malfunction. Hello Group, I'm in need of help on this Park Ave; no crank, no flashing security light(with key on), all fuses check good. I've got no communication with the theft module(under the rear deck) so I replaced it with a used one and tried the relearn procedure an...
September 18, 2015
2006 GMC Canyon SLE 2.8L No Start, Cuts out, MIL Lamp on VIN: 1GTCS14826
U1000: class 2 data link malfunction. ... restart at the time, finally got it started and drove it in, had several communication codes in several modules, started it up w no problems , sat over the weekend and yesterday it wouldn't start, The key chime was going off even with the key out, acting f...
September 22, 2015