My 2025 Ram 1500 had this issue for the first time yesterday. It's currently in for service after having it towed. Would not unlock the truck, used the key in the fob which set off the alarm. Tried touching it to the start button and got "key fob not detected". No way to shut off the alarm other than wait it out. Had my wife bring my spare key, which also did nothing. Tried disconnecting the battery which also did not stop the alarm. Most frustrating few hours of my life sitting in the Walmart parking lot trying to figure out what to do and waiting for the tow truck. I'll try to remember to update this thread if there's a fix, but I have lost all confidence in this truck and that it wont strand me again.