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Instrument cluster too? Anything plugged into the on-board diagnostic port?
 

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2009 G8 GT
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Have you changed any electrical components on it, like Alternator? If you go into Engineering mode look at your voltage, what's it doing when it happens? Any codes stored?
 

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You are going to have to get a scanner that reads (B)body codes and U codes for data faults first, you will find either communication problems with module/s or a VIN mismatch
 
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