Key Fob don't work

BoilardZ

For what it's worth:
I recently experienced the same issue. Key fob suddenly stopped working, and my backup key fob also didn't work. I replaced batteries in both, and cleaned the contacts really well, but no dice. I double-checked the new fob batteries, and they registered 3.3 volts. So I figured the problem must be in the car's receiver.
I was about to take the car to the Stealership when I decided to make a Hail Mary move: I bought another set of new fob batteries from a different store. Now both fobs work!
There are two lessons here:
1. Even if a new battery shows full potential (i.e, voltage), it doesn't mean it has sufficient power. Sometimes batteries sit on store shelves for a long time and degrade before you even get them out of the package.
2. Occam's Razor. The simplest explanation for fobs not working is that you have dead batteries. Make triple-sure your batteries are fresh and good before moving on to other theories.
Good luck!
Steve