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underpants

(196,539 posts) Fri Mar 6, 2026, 06:33 PM Mar 6

Need help - I changed the battery in my car key fob now it won't start with that key [View all]

2010 Honda.
This is a key fob that locks/unlocks the doors and has a panic button but I still turned the key IN the ignition to start it.

The spare key still works. Starts the car.

The key fob with the new battery unlocks and locks the car. All the lights come on but there’s nothing when I turn the key.

I’ve watched a couple videos but those mainly deal with remote start no key fobs. BTW - many of those I’ve learned do have a physical key and the way to start the car with it usually is in the glovebox.

Ideas?
Do I need to go to a dealership? 🙄💰
A locksmith?

22 replies

= new reply since forum marked as read

Highlight:

Need help - I changed the battery in my car key fob now it won't start with that key [View all] underpants Mar 6 OP

Try asking at Reddit. NT mahatmakanejeeves Mar 6 #1

If you have an "automotive locksmith" in your area... LuckyCharms Mar 6 #2

Try flipping the battery. I had the same problem and i flipped the battery OLDMDDEM Mar 6 #3

This isn't a flat battery underpants Mar 6 #9

Check with a Honda forum online dweller Mar 6 #4

not editing my post dweller Mar 6 #7

I was just going to say something about that! 2naSalit Mar 6 #14

did you ever get it worked out ? dweller Mar 6 #16

I did... 2naSalit Mar 6 #17

YAY !! dweller Mar 6 #18

Take it Ace Hardware Sedona Mar 6 #5

See a locksmith that handles key fobs. Ocelot II Mar 6 #6

Thanks. I'll look it up underpants Mar 6 #12

What model Honda? nt Phoenix61 Mar 6 #8

Insight underpants Mar 6 #10

I think the Honda is the same as my Dodge van (you need a code to deal with the anti-theft system). waterwatcher123 Mar 6 #11

Yes. Great idea. I've had to do that after a battery change and, I think, a tune up underpants Mar 6 #13

This is actually pretty common these days (this is a way to keep you bringing your car to the dealer). waterwatcher123 Mar 6 #20

There's probably a reprogramming sequence... 2naSalit Mar 6 #15

Some suggestions from AI Jim__ Mar 6 #19

Thanks. underpants Mar 7 #21

Did you get this fixed? Marthe48 Mar 7 #22