u2105 code 2005 buick lacrosse

mark78

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2005 buick lacrosse
hello , I have a2005 buick lacrosse 3.6 and the code u2105 came up as loss of communication to the ecm . has anyone else had this code and if so what did it take to fix it ?
 
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MelsRegal

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start by checking for a blown fuse or bad relay. Beyond that it requires a diagnostic tool like a Tech II.
 
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