my data in my vehicle not working

Our team understands how frustrating it can be when your in-vehicle data isn't functioning as it should. We would be glad to connect and learn more about what you've been experiencing. Please send us a private message to OnStar_Support with your VIN or OnStar Account number and full name so we can look into this further. Just select the envelope icon at the top right of your screen to get started. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement. 

yeah bro this issue happen sometimes

maybe first check if your OnStar subscription still active or expired, because if it end then in-vehicle data stop working

also try simple things like:

restart your car system (turn off car for few mins then start again)
check signal/network in your area
go in vehicle settings and see if data is enabled
if still not working then better contact OnStar support, sometimes they need to refresh connection from their side

hope it help