Join Date: Jan 2012
Location: Central New Jersey
Iím having a similar issue with my one week old GMC terrain Denail. Except the sunshade move a little bit and the sunroof will not open at all I will be sharing your information with my service advisor wish me luck. in my case the sunroof never worked great since I got it, might be the switch or something, never worked as the manual says. The manual states I should be able to push hard on the button and have an open fully the same for the sunscreen shade. You the think they Would have tested all this at the factory.
2018 Terrain Denali 2.0T FWD- Red quartz tincoat -driver safetyII, sunroof, comfort pkg , advance safety pkg ( surround vision )
Formally owned 2012 Terrain SLT-2 Fwd 2.4 Ltr