Go on Amazon and search “Chevy Colorado fob programmer 2015” and find the one that has the same buttons as your remote (remote start or without). It should be around $60ish. I got one and it worked I’ll get the link for mine in a sec.

Edit: or you could just buy a new shell for $10 on eBay. But if you buy the programmer on Amazon it comes with a new fob and you can program more remotes

Edit2: link