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U0100 Diagnostic Trouble Code Discussion for July 2008

Lost Communication With ECM

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Trouble Ticket Help Requests for DTC U0100
Help Request Posted
2004 Cadillac SRX 3.6L No Start VIN: 1GYEE63784
U0100: Lost Communication With Engine Control Module. ... but not come out). When this happends there is no check eng. light on and no communication with the ECM (you can comm. with all other modules). After awhile when it cranks and starts there will be a code P0700 in the ECM...
July 28, 2008