Key fob not working, any help?

welcome! if it has an uncut key, perhaps it's not the correct fob, or programmed incorrectly.

 

You can fix that with a new fob and the Mini VCI, a cable that plugs into a laptop and gives you full dealership software options, including key programming. Costs about $25. Or you could go to the dealer and have them do it.

Perhaps a locksmith can cut the key if you can get the lock code--traditionally you have to pull a cylinder which means removing door trim. Not sure about the Prius.

 

I doubt this is the OP's problem, but actually would like opinions anyway.
I recently got a new Cell Phone.
I carry my Cell Phone and Fob in the same pocket.

After getting this new cell phone, I got in my Prius-door did unlock-but when I pressed power, I got "Key Not Detected". I was able to remove the fob from my pocket and hold it near the power button and it worked.

Then in the course of the next few days, I noticed the whole system acting a little suspect. I think I got the "Key Not Detected" message one more time, and had a time or two where when approaching the vehicle the system seemed slow to recognize me.

Since I'm approaching 3 years of ownership, I thought I'd try the "easiest" answer first and simply changed the Fob Battery. Actually I did both, the one I use and the back-up. The new battery is in, and it seems to be working fine. BUT...I got into my Prius and once again got the "Key Not Detected" message, waited a few seconds tried powering up again, and was fine.

I've since just gone from carrying my Cell Phone and Fob in the same pocket, to now carrying them in separate pockets and so far everything is fine.

So I'm hoping it's just interference from my new cell phone. That it's not some early signs of a bigger problem.
Kind of sucks if it is the cell phone because I'm committed to it now, and I need to be able to carry both at the same time.

Sorry, I apologize, --probably should of started a separate thread, as I don't think this has anything to do with the OP's issue.

But just wondering if anyone else has experienced Cell Phone/Fob interference issues.

 

i agree, it's the cell phone. especially since you proved it by keeping them apart. just give some thought to the area they are now trying to 'talk' through.

 

The key is probably not the correct key for the car. Most likely the dealer will have to reseed the car to the keyfob, then everything will work properly again. If you choose to reseed, it would be a good opportunity to get a 2nd key programmed.... for no additional charge

 

maybe the stuck button caused some damage.