ANSWERS: 1
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the instument cluster in modern cars is more closely related to a computer monitor than the old fashioned mechanical instument clusters. Your instrument cluster has an electronic controller that runs it. That could have gone out. Or, the engine computer / body control module could be malfunctioning and sending bad codes. Of course it could also be a bad connection or a bad wire. Sadly your best bet is to have the Chevy dealer take a peek.
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