Question about the grill shutters on the ATS... When the car is parked, should the grill shutters be opened or closed? I have a 2013 ATS. My check engine light turned on earlier driving in upstate NY towards VT, thinking maybe it's grill shutter related. Passed someone on a single lane road, accelerated up to ~70 mph then coasted to ~55 after the pass. Maybe ~15 min later the check engine light came on. Had a similar situation last year and ended up being the motor for the grill shutter was burned out. Doing a little shade tree diagnosis before calling the dealership Tuesday.
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