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GMC had to reproam some dash assemblies, because they would flicker and work intermitantly(sp?). If you are getting no turining over of the starter, maybe the battery post is broken, as was the case with my 2002 Envoy. The lack of a solid connection at the battery post caused this to happen, and the car wouldn't start at a local shopping center. The dash would freak out as you mentioned. Thank god we were near a Wal-Mart (hate to say that), but they did replace the battery and showed me where the post had broken. Strange that it was corroded so bad that it broke!

2007-03-18 22:20:29
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Q: Why would the dashboard lights light up and the gauges twitch but there be no sound from the engine when you turn the ignition key on a GMC Envoy?
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