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just want to throw this one out there/// i just picked up a 2007 c6 with a z51 package love the car since the last 2 of my vetts where c3.s this is a higher tech machine no more old school now you need a degree to fix this bad boy anyways i was getting service active handling messages ,brake lights on with no brake applied cruise control no work so i started to see if i could find the problem since i work on electric forklifts for a living and battery voltage is a major factor in most of the problems we see in systems failing. So i started with the battery and you wouldnt believe that both terminals came off by hand. Ok i thougt maybe this could be my problem cleaned battery and terms put back nice and tight . started to rain good time to test traction control cruise control came back and no service active traction control brakes felt better dont know what to say if this can help someone thats a good thing later mike