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I got the code U0073 on my 2008 Cadillac CTS 3.6L, could a bad fuse cause this trouble?

Vehicle: 2008 Cadillac CTS 3.6L

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U0073 Control module communication BUS off

Yes it can be , this type of code set when there is power at the module that is setting the code, it also depends on which module set the code.
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U0073 CADILLAC Code - Control Module Communication Bus OFF
Read more: https://www.autocodes.com/u0073_cadillac.html

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