Very likely a bad FOB is the other FOB works fine.

 

All 3 of my FOBs work, yes i bought more then i need, i had misplaced one of them for a couple months

I have found that any FOB can malfunction
sometimes the dealer has to do a re flash
sometimes the FOBs battery can have a bad contact
other times, like if you park directly in front of some stores, like the 7/11 & certain truck stops, all of the fluorescent lights, automatic doors, & cameras can cause a temporary malfunction. I now try to park further away from the windows & front door of the places that i know that i have had this happen to me in the past.

Other FOB information
Your Ram FOBs can have either Dodge or Ram printed on the outer case, the blank chip & battery are identical in both, mine has the Panic, Unlock, Lock, & Start buttons
The case marked Dodge is cheaper then the case marked Ram, if bought at the dealership
a Starscan tool is needed to program the blank chip to work with your vehicle, IF you have 2 working FOBs, you can program a 3rd FOB yourself

You can save money by buying a NEW blank FOB or a Transponder key online through IKEYLESS, the blank door & tailgate Valet Key that fits into the FOB costs extra
I didn't see a 4 button FOB on that website, so call them & ask about it

i can't confirm the part about ACE hardware in this film
https://www.youtube.com/watch?v=JS-r7vh4X1s

Good Luck

 

I agree FOB might need a flash or bad FOB

 

Having issues with my key fob. The doors would not open remotely but truck would start.
Replaced battery. now doors open remotely but truck will not start.
Is there a time limit on replacing battery. Hate to go to dealer. The spare was lost a long time ago.
Any suggestions?

 

my spare fob did not work, back to the drawing board...

 

bad fuel pump. only 26k on the clock, little disappointing. I bought an extended warranty when I bought the truck, so at least that worked out, I guess.