Problems with your Fiat 500x key not detected? We can help.

Today we’re looking at the new style of Fiat key. Its’s a smart proximity key which means it doesn’t have a key blade or an ignition lock. Instead, to start the car you simply need to press a button.

The button has been placed where the lock used to be so it’s easy to find and use. However, this week we saw our first problem car, a 2016 Fiat 500x.

Fiat 500x key not detected

Fiat 500x Key Not Detected Problems

Our customer visited our workshop because although the buttons worked to lock and unlock her car, it wouldn’t start reliably. When she pressed the button to start the engine, some of the time she would see the following warning message on the dashboard.

Fiat 500x key not detected


Are you getting the message telling you ‘Key Not Detected’?


Is it your Fiat Car Key Battery?

There’s a big problem with cheap car key batteries. When we see any smart proximity key that is giving problems, the first thing we do is put a good quality car key battery into it. To read about all about the problems with cheap batteries click here

If you have a cheap car key battery fitted, then you’ll end up with problems.

Our customer with the Fiat 500x was a typical case. She was sitting for up to twenty minutes pressing the start button, locking and unlocking the car and wondering what to do. Once we changed the batteries, the ‘Fiat 500x key not detected’ problem vanished and both her keys worked perfectly.

How Do I Change my Fiat 500x Key Battery?

These keys are exactly the same as the Jeep and Chrysler smart keys, except for the Fiat badge. Changing the car key battery is very easy. You’ll need a good key battery and a HOW TO video.

Here’s our video, don’t worry that it’s aimed at the Jeep and Chrysler market because it will still help you.

If you don’t have a new battery, and you’re stranded somewhere don’t panic. Click Here to find out how to carry out the Emergency Start

Thanks for reading and we hope this helps you. Any questions, please ask below in the comments.


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5 replies
  1. Ken Paterson
    Ken Paterson says:

    Hi, 2016 Fiat 500X. Remote keyless key fob will not open the doors and is not recognised by the ignition system. I have fitted new Duracell batteries to both remotes but neither remote will work. I now have to open the door with the manual key and press the “Start Button” using the body of the remote key fob. This is the only way I Am able to start the car. Any suggestions would be appreciated. Thankyou

    • Steve Bulleyment
      Steve Bulleyment says:

      Hi Ken, that’s very odd. Do the lights flash when you press the buttons. Silly question, but have you removed the safety sticker on the battery?

  2. Jessica
    Jessica says:

    I have the same issues as mention above. Replaced batteries in both fobs, can only unlock car manually (no flashing light) and start the car by using the fob instead of finger! Any ideas before I spend a fortune no doubt with fiat ?


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