Battery in key fob ?

Can’t say about your truck, but the keyless entry system on my BMW X5 works with a dead fib battery. Both the door lock and the ignition use near field chips, so if the car senses the key within 5 feet of the door, it will unlock when you touch the handle, and as long as the key is inside the car, the engine will start and run. Of course, the fob buttons require the battery to work.

I pretty sure the owners manual has the procedure for a dead fob battery.

Me Again wrote:

mich800 wrote:
If it is push button start you push the button with the key fob and it will start like normal.

Are you saying the truck will sense the presence of the fob even if it's battery is dead? Will keyless entry work with a dead fob battery?

Yes, it will start because it uses RFIF technology.
No it wont remotely open the doors because it needs the battery for that function.

Me Again wrote:

mich800 wrote:
If it is push button start you push the button with the key fob and it will start like normal.

Are you saying the truck will sense the presence of the fob even if it's battery is dead? Will keyless entry work with a dead fob battery?

I can open my F350 without the key or the fob just push the combo to the pad.

mich800 wrote:
If it is push button start you push the button with the key fob and it will start like normal.

Are you saying the truck will sense the presence of the fob even if it's battery is dead? Will keyless entry work with a dead fob battery?

Don't need the fob, just a key and a good battery IN THE TRUCK!

If it is push button start you push the button with the key fob and it will start like normal.

Yes, it would still run. Does not need fob for engine to run.