This post seems to sum up the changes for 2017 vs. 2016.
https://cleantechnica.com/2015/12/28/2017-chevy-volt-brings-minor-tech-updates-vs-2016-volt/
Overall not too many changes, just some technology updates/upgrades as well as 50-state availability.
https://cleantechnica.com/2015/12/28/2017-chevy-volt-brings-minor-tech-updates-vs-2016-volt/
Overall not too many changes, just some technology updates/upgrades as well as 50-state availability.