U0002 = High Speed CAN Communication Bus Performance. This is a generic code.If you leave certain accessories plugged in your 12 volt supply (such as charging certain cell phones) it may set that code. Not all accessories will cause this. Some accessories will back feed the system when the vehicle is shut off, confuse the circuit and set that code.
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Here is a video on how to fix engine code p0449
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The only way to fix the Volvo-503 code is to take it to the dealership and have them fix it for you.
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Diagnose the problem and fix it
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