Kona unresponsive - Strange flashing drive modes - Dead 12V or Immobilized?

Got up this morning to the Kona behaving very strangely. It seemed to be unlocked when I got to the car. Not sure now if it responded to my unlock press but it doesn't respond to the key fob now.

When I got in, the drive mode indicator lights were flashing and the key light was on on the dash. Otherwise, completely dark and no response from the power button.

When I got out the right front turn signal was partially on and the left back turn signal was on. They went off after a time.

The car was plugged in. I started it to charge last night before going to bed. It was at 80% at 2AM according to blue link. But it is now unresponsive on there as well.

There were no lights on on the vehicle or anything and it has been driven regularly so I can't see why the 12V battery would be dead so I don't want to jump it if it's not dead.

At a loss... feels like it needs a reboot... going to phone the dealer once they're open this morning.

 

I just checked Bluelink and its last report indicates all doors closed and locked when it completed the charging cycle at 2AM. I tried both my and my wifes fob so it can't possibly be both at the same time. I'll try the reset with the 12V...

 

Q on disconnecting the negative terminal. Is it sufficient to disconnect just the small plug that runs to the terminal or should I remove the entire ground cable from the negative post?

 

that's the answer I needed. thanks.

 

Yes, I keep a small screwdriver with socket but it doesn't have the 10mm socket required. Will definitely add...

After its initial modest flashing I mentioned at the start, the disconnect of the battery has had no impact. The car is completely dark. I don't have a voltmeter so can't test the battery. Doesn't make sense that it would be dead considering it would have been charging when the car was charging right to 2AM and I got in at 5:30AM.

Dealer will be open soon... will call them for advice and report back.

 

Here's a video of just after I first got into the car. You can see the drive mode lights flashing and hear the relays in the car (and me clicking the key fob) as well as the ding of the car system, but that's all I've got from it. After this it has been completely silent and dark.



The attached picture shows the dimly light right front turn signal. The left rear signal was in a similar state. Both lasted for a couple minutes before going dark. You can also see the EV Battery is green. (80%)

 

Got it jumped and it's fine now. Hyundai dealer recommended that since the battery is (just) out of warranty, to grab one from Lordco. So I've done that and I'll replace it. Boo. 2 year lifespan for a 12V battery? Terrible. Thanks all for the advice. That has to be the weirdest behaviour from a car I've ever seen. Chalk one up to the ICE camp, at least it's easy to know what's wrong if the engine doesn't crank.

 

Hahaha! Thank you for this informative list!

Clearly! I went to Lordco. They didn't have anything recommended for the Kona Electric in their system. So he looked at the battery and you could tell he had never seen one quite like that. lol. Anyway, we got one of similar spec. Maybe 1/4" taller and no recessed posts so the connections are a little tight, but otherwise fine. Nowhere for the plastic cap for the negative post to be secured to unfortunately so it is exposed. Might have to think of a way to protect that.