My remote start works from about 40' away
Thinking maybe the battery in your key fob requires replacement? (For my Nissan Murano, it's a service manual scheduled maintenance item.) I have a two-car wide driveway, from inside my house through front window (about 30') remote start works fine. If on the far side of driveway (about 40'), I just hold it outside my front door. Works great either way, and I like heated driver's seat and heated steering wheel coming on at same time when it's cold.