You are correct. ACC was not available until, only on the 2017 Volt Premier, starting in the June 2016 time frame. I purchased my 2017 Volt Premier with ACC at the beginning of July 2016, 2017 Volt Premier vehicles with ACC had only just started to appear at dealerships in June. ACC was never available on the 2016 Volt Premier or LT.Fellow Canuck here!
I'm thinking the 2016 premier does not have ACC. I think ACC came out in 2017. Maybe double check on that with them.