[DudeCS]

@CAJack42 highlighted a potential problem for older model year Passport owners due to a weak key fob battery (such as, keyless entry not working well). Key fob battery life is approximately 2 years, dependent on usage...

If your key fob battery is completely dead, this is the emergency procedure for starting your vehicle...

The replacement battery is CR2032. Put an extra battery in your glovebox or center console if you may need to replace soon. Here is the procedure for key fob battery replacement...

 

[Steve324]

Great info for a newbie owner like me! Thank you!

 

[darksky]

Battery in my key fob lasted 2 years and a month (25 months). I've always carried a spare battery for any of my vehicles that use a key fob.

 

[CAJack42]

Battery was down to 2.96V. New is 3.32V. Kind of like my Pilot fob. When it gets below 2.99V it starts needing several presses on buttons to work.

 

[ProdGirl]

mine just turned 2 today, this is helpful to know.
I am getting a CR2032 battery out of my workbox now.

Also for those unaware of this type of battery, do not open the package and let two of these batteries touch each other. They will heat and possibly explode. We use them for particular remotes at work.