Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Silverado instrument cluster repair
Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Trailbalazer instrument cluster repair
Either a gauge problem, or you are over charging due to a bad alternator. You will need a volt meter to decide, but...get it checked.
You shouldn't be over 14 volts running.
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