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I had my 05 C6 into the dealer for the check engine light remaining on and they fixed that but now my clock display is blank and Yhe buttons for setting the clock manually do not respond to the touch.  My Caravan bud took his 06 C6 in this week for shock replacement, and his clock display is now blank with inop controls also!  The dealer told him several others have had the same problem after service-mainly removing and reinstalling the battery-and they have no idea what is causing it!  I had a reauthorizing signal sent by Sirius/XM, no help.  I also have had the red line through the GPS when it would normally not be there...curious and frustrating.