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U0100 Diagnostic Trouble Code Discussion for April 2017

Lost Communication With ECM


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Trouble Ticket Help Requests for DTC U0100
Help Request Posted
2004 Cadillac CTS 3.6L No Start VIN: 1G6DM57724
U0100: Lost Communication With Engine Control Module. Customer stated that the vehicle sat over the winter and when they went to start it the battery was dead. Vehicle started and ran fine before winter. After new battery install the vehicle started and ran normal. Next day, no crank. They disconnected the batter...
April 27, 2017