What is "AutoAuth Access", why I need it?
AutoAuth is a service that gives technicians the ability to use their aftermarket diagnostic tools to perform secured functions on vehicles through the OBD port that would otherwise be locked by the Auto OEM.
Starting with most 2018 models, FCA implemented a Secure Gateway Module (SGW), similar to a "firewall", to protect the vehicle network. Only certified diagnostic tools with Wi-Fi access are compliant to properly unlock the gateway's tester authentication process to perform these diagnostic functions.
Reference Link: