I recently had a Mobile Locksmith make a 2nd Passive FOB for me.
Actually the mobile locksmiths were out, but they also have a store front.
I handed the gal in the store my Primary working FOB,
I also handed her the FOB that i had not been using, believe it or not, it some how shorted out, as it sat on the Entertainment Center shelf. When it shorted out, it caused my Ram's horn to start beeping, right up until i removed the battery.
30 minutes later, i had a new FOB
she had a programmer in a suitcase, that she plugged into the OBD2 port
By the way, for a new FOB, the programming & a brand new Valet Key, she charged me $145.98
IF, you brought in a NEW FOB, they will program it for $49.95
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unfortunately, the dealerships prices are not as kindly