I published an unofficial HondaLink custom integration for Home Assistant.
It can expose supported HondaLink vehicle data like fuel level, range, odometer, oil life, tire pressure, door/window/light states, GPS location, remote engine status, and 12V battery status when returned by the HondaLink API. It also includes remote actions like lock/unlock, engine start/stop, horn/lights, and refresh for compatible vehicles.
Repo: https://github.com/daviddelahoz/ha-hondalink
It’s early work and depends on Honda’s private cloud API, so behavior may vary by vehicle. Feedback and testing are welcome.