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2013 GMC Acadia sunroof not closing flush. My sunroof will not close flush or open to vent mode. It opens fully, upon closing does not quick close but stops short about 2inches then have to press the close button again. When in close mode, the sunroof does not close flush at back part. When trying to open to vent mode, sunroof will not pop up. I have read to reset it by holding the vent mode button until sunroof cycles through opening and closing but it has not worked. It sits about 2mm below threashold when in close mode. 

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