Hello Guys. I'm new to the forum. Just picked up my '19 Stinger GT on Dec. 22nd. I found this thread after taking my Dad for a ride and trying to show him some of the features, including the ISG (Idle Stop and Go) that didn't activate when I wanted it to. After organizing some of the paperwork that came with the car, I found this card from Kia that was banded to the gear lever with some others that has information for the ISG (Idle Stop and Go):
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I don't know if it will be much help with what's already been discussed, but at least it eases my mind that there are some factors that keep it from activating. I still turn it off anyway.
Edit: Added other side