I picked up my new 2018 Equinox about a week ago. I’m having the same problem with OnStar voice commands. In particular the “Store” command doesn’t work. It usually gives me the weather, sometimes navigation cancel, sometimes call or dial, but almost never “Store”. Just about every other word and number I’ve tried seem to mostly work (not perfectly). I’ve tried pronouncing it a dozen different way but none have worked. Anyway, “Store” doesn’t work here either. Since I have a lousy memory for numbers, the OnStar calling feature is virtually useless to me as is.
I spent about 45 minutes on the phone with OnStar today and, while he tried to be helpful, he was completely clueless about where the problem might be, or what to do about it. Like others he finally gave up and told me to take it do the dealership. Obviously useless advice. The problem clearly lies with OnStar voice recognition. I don’t need to sit at the dealership for a couple of hours only to be told it ain’t a hardware problem.