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U1000 Diagnostic Trouble Code Discussion for August 2005

Class 2 Communication Malfunction

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Trouble Ticket Help Requests for DTC U1000
Help Request Posted
1999 Pontiac Grand Am SE 2.4L No Start, Stall VIN: 1G2NE52TXX
U1000: Class 2 Communication Malfunction. Here we go...this is a wild one. The Grand Am while driving down the road the ABS, security, MIL, Traction off lights all come on. Upon inspection I found U codes in all modules that say loss of comminucations basically. This thing does not do it all the time ...
August 01, 2005