I get the Active Handling "Warming Up" also sometimes. I only get it at work sometimes when creeping out of the parking lot so I don't scrap. Something to do with getting a baseline reading within first 100 feet of driving. If it goes away next trip it isn't anything to worry about.
Good luck on your coolant leak.
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08 C6 Z51 Coupe with TVS2300, a little more than stock HP/TQ.
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