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I think my Ariya knows it’s going back on Tuesday.
I had another 12 volt battery failure yesterday, so a new battery fitted by the RAC, its the third one since I’ve had it and this morning I’ve had got a load warnings on the dashboard which Ive managed to reset but it’s funny how right at the end of my lease I’ve started to get niggles again, it’s been alright for the last 12 months.
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Surely there must be an underlying fault somewhere that’s causing the 12v battery to fall over? Trouble is nobody in the chain is interested in diagnosis these days, it’s all just replace the failed bit and move along. Somebody is going to buy that car and will still be suffering the same issues.
what are you changing to fastbike1000
I’m picking up a Hyundai Ioniq 5 N line S mitch. I just hope Hyundai have sorted the ICCU issues because I really don’t want another lemon😂.
Surely there must be an underlying fault somewhere that’s causing the 12v battery to fall over? Trouble is nobody in the chain is interested in diagnosis these days, it’s all just replace the failed bit and move along. Somebody is going to buy that car and will still be suffering the same issues.
I really don’t know mate, for the first 12 months it was in and out of the dealers Nissan Telford (bloody useless) then I changed dealers to the one in Shrewsbury and they seemed to get to grips with it with one little niggle which was sorted really well and quickly and it’s been fine until yesterday.
Got a very similar problem with our dreaded Mazda CX60 PHEV. On paper lovely car, in reality absolute lemon without the benefits that an actual lemon would bestow!!
Don’t use it much but deliberately took it to Burnley and drove in petrol mode to ensure alternator was charging the battery for the following day. Or so I thought!
Plugged in overnight and drove to my daughters physio session in Morley. 2 and a half hours later, not a thing working. RAC man tested 12v battery and it indicated 4.7v!!!
Cannot for the life of me work out what could drain the battery so quickly?
Eventually got home and RAC coming Monday to put another battery in at the cost of £311 to Motability. Which will probably end up lasting weeks, by which time I can only hope the thing has gone back. I’m seriously considering just doing without it’s just such a pathetic excuse of a vehicle. Worst car ever. Best car ever – £150 20 year old VW Polo Bread Van. Difference in price ~£55K!!!!
I had this issue when i had a Kia soul EV went through 2 batteries in a month but on the third visit the guy from RAC fitted a leisure battery because he detected a constant drain from the car and that cured it. Never had the issue again until i swapped it lease end 2 years later. The Kia garage tried telling me it was my fault as i was constantly pinging the car from the app but as i tried to explain to them the app was crap so i never used it and took it off my phone within a week of picking it up. All this happened even though i had battery save enabled in the car setting which is supposed to detect a drain and charge it from the high voltage battery but obviously that never worked never had this issue with my Ioniq 6 which has been flawless from day 1.
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Hyundai Ioniq 6 Ultimate trim
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Loves 3D printing & Plastic model kits
----------------------------I think its common for BEV’s have some kind of internal software problems that prevent the 12V battery from being monitored properly, leading to charging issues.
I think the problem with mine is it was one of the first into the country, so a lot the faults wasn’t ironed out.
You could be right Kezo. If you look at most of the different manufacturers forums/facebook their seems to be a general consensus of 12 volt battery problems.
I think there are, on some cars, phantom drain issues. That, plus they do fit very small and crappy 12v batteries as the cranking amps/big power not needed. I don’t understand why they don’t just fit a lithium battery – well, I do understand, it’ll probably be 50p more expensive!
Kia /Hyundai had problems early 2021 with their charging regime for the 12v, it basically didn’t allow for it to be charged often enough and, when on charge, it was for a short period only, so loads went flat. They updated the software and included a lot more 12v charging sessions which solved the issue (unless you had a component causing 12v drain – see phantom drain above).
I’ve had a Kia Soul since mid 2021 then an Ioniq 5 since Jan 2025. Neither has had any issues with the 12v. But I do spend a fair bit of time in Utility mode – and that defaults to charging the 12v when on, so I may be helping the battery cope with any suboptimal conditions.
No ICCU issues for me so far – 11,500 miles…touch wood…avoid black cats etc…
In life, it's not who you know that's important, it's how your wife found out.
I think there are, on some cars, phantom drain issues. That, plus they do fit very small and crappy 12v batteries as the cranking amps/big power not needed. I don’t understand why they don’t just fit a lithium battery – well, I do understand, it’ll probably be 50p more expensive! Kia /Hyundai had problems early 2021 with their charging regime for the 12v, it basically didn’t allow for it to be charged often enough and, when on charge, it was for a short period only, so loads went flat. They updated the software and included a lot more 12v charging sessions which solved the issue (unless you had a component causing 12v drain – see phantom drain above). I’ve had a Kia Soul since mid 2021 then an Ioniq 5 since Jan 2025. Neither has had any issues with the 12v. But I do spend a fair bit of time in Utility mode – and that defaults to charging the 12v when on, so I may be helping the battery cope with any suboptimal conditions. No ICCU issues for me so far – 11,500 miles…touch wood…avoid black cats etc…
That’s good to hear about the ICCU mate. All I seem to read about the Ioniq 5 at the moment is ICCU problems.
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