As I understand it, The State of Massachusetts passed this State Law by referendum (i.e. direct yes/no vote by voters and not law makers) in 2020, but Coalition for Safe and Secure Data (a.k.a. Alliance For Automotive Innovation, reported to be an auto manufacturers funded group) filed an injunction (likely associated with a law suit against this Law) stopping it from being enforced during the legal process. The injunction was lifted by a judge and the AG (top law enforcement for the State) will being enforcing the law 6/1/2023.
My understand is:
the 2020 law forces auto-manufacturers to make it accessible to owner and third party repair shops the wireless data collected by the car that is currently only accessible by dealer repair shops. As I understand it,
an earlier 2012 law only addressed accessibility of wired-data. This law was to "close the loop hole" as more of the car data is now available by wireless means only and thus not available to third party repair shops prior to this 2020 law.
Not being a lawyer, above are my understanding of facts from a layman's perspective.
Reference:
https://www.cbsnews.com/boston/news/massachusetts-ballot-question-1-right-to-repair-vehicle-data/