Hi, this thing happened with me and posted all story here:
Hi everyone, I would like to share my findings about why the Forward Collision Warning on my 2023 RAM 1500 Classic never worked. I took her 4 times to dealership, they acknowledge it is not working but the computer says it is, no error codes. To clarity, my pickup came with Full-speed Forward...
www.ramforum.com
In short, the FSFCW+ does not see trees, cardboxes or people, it sees vehicles. To activate, your speed compared to the car in front of you should be high enough a certain value which I don't know, I know that because mine mostly activates when the vehicle in front of me is stopped in a red light or it is braking to turn right on a driveway, and I did not touch the brakes until it is very close, like 15 meters away.
If your speed compared to the vehicle in front is not too much, the FCW will not activate and you will rear the vehicle in front. My truck does not have the front parking sensors and the Adaptive Cruise Control, which I think can mitigate these situations. Your wife's Telluride has, so that's why it reacts to.