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U1300 Diagnostic Trouble Code Discussion for August 2009

Class 2 Data Line Short To Ground

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Trouble Ticket Help Requests for DTC U1300
Help Request Posted
2002 Buick Rendezvous CX 3.4L im monitors VIN: 3G5DB03E92
U1300: class 2 short to ground. here we go...this vehicle will not set the im monitors on the heated o2,catalyst,and evap...no pcm codes /did the drive cycles 5 times by the book... i highley suspect ignition switch because of previos Rendevous nightmares...thank you all in advance...ps the ...
August 03, 2009