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You need a data plan. The $25/mo connected vehicle plan from onstar will put the speed limit sign back, as well as the google assistant and the built in navigation. I’ve also heard that you can connect the vehicle to a hotspot from your phone to get these services, but cannot confirm.
Must have active data plan...and download offline map on your Head Unit. If your vehicle is new, it may take a couple days to get the offline map downloaded if you are taking short trips. Force it by connecting your head unit to your at home wifi, then launch google maps, hit the settings gear, select offline maps, and force the download of your home area...your sign will start workin...but, unless you subscribe to a data plan...it won't work...
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