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Two years ago, the ICCU failed on my My2022 EV6, which I had for three years. It was a major hassle when it happened. We were stranded in the Heathrow parking lot for hours because the vehicle likewise experienced a 12v failure earlier. Beyond fifty miles per hour, there was a juddering sound that was later determined to be loose tyre foam. (Oh, and it was also taken from my driveway using the notorious "gameboy" approach; the only reason I was able to get it back was because I had hidden an AirTag in the boot).
What a fortunate vehicle, my friend.

About nine months ago, I traded in that vehicle for an EV6 with the MY2025 redesign. I purchased it with just 200 miles on the odometer, but it was pre-registered from March 2025. Everything was OK until...

This very moment. I hopped in the car at the airport upon my return from vacation, but as I turned the key to start the engine, a red battery sign and another caution light illuminated. Even though I found it strange that a brand new AGM 12v battery could drain so rapidly, I attributed it to the previous hot weather and set off on the 1.5 hour drive home.

The throttle became clearly slow thirty minutes after the "stop safely and check power supply warning" message appeared. Fortunately, I was able to pull over to a petrol station while travelling on a fast dual road.
A RAC person arrived approximately half an hour after I contacted Kia Assistance. He confirmed, unsurprisingly, that he couldn't fix it and then summoned a flatbed truck.

Suddenly, he takes off, and the RAC texts me to say it will be here in four to seven hours! I try calling the RAC again, and after waiting 25 minutes on hold, a jobsworth finally promises to return our call in 10 minutes after prioritising it. We wait for him to return our call and continuously checking the RAC tracking, but the estimated time of arrival (ETA) stays the same.

After another 1.5 hours of searching, I finally located a nearby company that sent a flatbed to haul us and the vehicle home. Interestingly, he started the automobile and drove it into his truck using a Noco booster. However, it was £350. Not ideal for a family, especially after a long day of flying home, but we were stuck there for four hours in all.

My day will be filled with yet another round of unnecessary trouble as I arrange to have the vehicle hauled to my dealership tomorrow.

Kia is becoming more and more loathed by me.

By the way, the two ICCU meltdowns happened in the summer, when temperatures were at their highest. Perhaps there's a connection; I don't know.

PS: If you happen to be reading this, Brian (from EV Odessey), I would greatly appreciate any suggestions or thoughts. You are the expert; I've followed your YouTube channel for four years.

I apologise for the news. I am relieved that you reached a safe stop.
So far, I haven't heard anything bad about the newest version of ICCU, so I'm hoping it will replace the old one.
The fact that we are currently experiencing a heat wave probably isn't helping matters.
Did the airport have inside or outdoor parking for the EV6?

It seems unlikely that the ICCU is actively cooled when the car is not in use.
The interior of the vehicle acts as a thermal greenhouse, and the ICCU is located beneath the rear seat.
Possibly yet another issue that Kia should work on.

Cooling has been enhanced in the most recent ICCU over-the-air updates for the majority of devices.
For instance, whether I charge or use V2L, my EV3 keeps its cooling flaps open and the cooling pump running.

I hope a replacement is sent to you quickly.

thanks for the reply.
The car was parked outside at the airport.
Been waiting 6 hours today (so far) at home for the RAC to arrive again. Spoke to the dealership - they said the MY22 ICCUs are easy to get hold of, but he’s not sure if MY25 can use that one. Having said that I’m not even sure I want one of the older ICCUs as I could end up going through this a 3rd time - I’ll try and check it’s a newer version either way.

Some customers are probably going to regret buying from ICCU because of the terrible reputation it has earned due to its many failures, and others are going to just stay away. It appears that in certain countries, Hyundia Kia is providing an extended ICCU warranty on select models. It would be helpful to boost confidence if this was done for all eGMP models worldwide. But when your car breaks down or you're otherwise stranded, a free replacement won't cut it.

Plus, Kia Assistance is terrible; the RAC still hasn't been up after two days of waiting. After two attempts, Kia Customer Service informed me that they are powerless to help and that I would need to continue contacting RAC. I mentioned that I bought a car for £45,000, but it broke down within a year, and no one would fix it. Blank looks were the vocal equivalent of what I got.

They stated it looks like ICCU, but it would take a few of days to check. The car is currently in the garage.

Considering that the "stop safely and check power supply warning" came on before the "battery warning light," is it necessary to replace the 12v?