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Discussion Starter · #1 ·
Had my ev6 for one week exactly and had to be rescued by the RAC. 12volt battery only had 7% charge. Dealership had no explanation and weren't much help. RAC disconnected battery gave it a boost and it then started. Further investigation tomorrow. Very, very disappointed.
 

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Interesting. I just saw a video a couple days ago showing that the system only charges the 12v battery during regen for efficiency. I wonder if this system is too aggressive, or if you just have a fault?
 

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2022 Kia EV6 First Edition Steel Gray Matte
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12 volt batteries are regular lead/acid batteries. It is actually very common for them to have a cell die at random which renders them almost useless.
 

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Discussion Starter · #4 ·
12 volt batteries are regular lead/acid batteries. It is actually very common for them to have a cell die at random which renders them almost useless.
RAC report states that battery is in good condition and "serviceable" but requires a full recharge. No mention of dead cells. I hope other customers have better luck with their cars and much better customer care service.
 

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I think it’s an unfortunate one-off. Many EV6’s in customers hands in other countries for a while now without any reported similar issues. I’m sure Kia will take care of it satisfactorily.
 

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Interesting. I just saw a video a couple days ago showing that the system only charges the 12v battery during regen for efficiency. I wonder if this system is too aggressive, or if you just have a fault?
That's actually a terrible design IMO. You could drive a long time on the highway in the US and barely use regen.

Both the first-gen EVs like ID.4 and Mach-E have had folks report 12V batteries failures and VW is now replacing the lead-acid battery with a lithium one to all ID.4 owners. The ID.4 uses a DC-DC converter that charges the 12V using the HV battery. That's a smart design IMO.

I suspect Kia won't fix this until more folks report it.
 

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That's actually a terrible design IMO. You could drive a long time on the highway in the US and barely use regen.

Both the first-gen EVs like ID.4 and Mach-E have had folks report 12V batteries failures and VW is now replacing the lead-acid battery with a lithium one to all ID.4 owners. The ID.4 uses a DC-DC converter that charges the 12V using the HV battery. That's a smart design IMO.

I suspect Kia won't fix this until more folks report it.
Well, we need more data at this point to draw many conclusions that the video seems to show. I can't imagine they would only recharge the 12V on regen, I think maybe it does while the battery voltage is above a certain point and once it drops below a set point it will charge the 12V from the HV battery. Hopefully we get more videos with ODB looking in.
 

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EV6 GT-line S AWD with heatpump in Yacht Blue on order
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The dealership came and collected my ev6 this morning and are going to do a full investigation. They did say that the 12volt battery is recharged by the main battery and will look to see if this is the problem.
Can't wait for your report back.

While I was sitting in the EV6 Electric Experience presentation car on Monday at my local dealer, it went clunk and everything went dark - 12V battery had given up throwing the HV contactors out. The Kia presentation team quickly switched 12V batteries (they had a spare round the back), but given that the car was in utility mode at the time I wouldn't have expected the 12V battery to have died.

John
 
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12v battery problems are not uncommon with electric cars in general. I had some serious issues with my iPace early on. The car would just slowly shut down flagging up a range of errors until it was dead. The common error was always "Traction battery fault", which threw Jaguar for a while. They updated a few control modules, changed a coolant valve and finally changed the 12v battery, which has fixed everything. I wonder if there is some common protocol around where the 12v battery takes it power from depending on the setting it is in. You would expect it to fill it’s boots from the main battery whenever required.
 

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Ford did a OTA software "fix" for the Mach-e a few months ago and it seemed to take care of their problem which looks to be the same as you are reporting. Those owner's issue was complicated by the fact that the Mach-e requires a good 12 volt battery to open the frunk to be able to recharge the 12 volt battery. One thing to know is that most flooded acid batteries will degrade quickly if they suffer full discharge too many times.
 

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Ford did a OTA software "fix" for the Mach-e a few months ago and it seemed to take care of their problem which looks to be the same as you are reporting. Those owner's issue was complicated by the fact that the Mach-e requires a good 12 volt battery to open the frunk to be able to recharge the 12 volt battery. One thing to know is that most flooded acid batteries will degrade quickly if they suffer full discharge too many times.
Wait... Ford has released zero OTAs for the Mach-E. What I've heard is the new Mach-Es have the latest software installed (BlueCruise, etc) that doesn't exist on pre-summer builds and dealers can update the software manually when the car is in the shop.
 

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Wait... Ford has released zero OTAs for the Mach-E. What I've heard is the new Mach-Es have the latest software installed (BlueCruise, etc) that doesn't exist on pre-summer builds and dealers can update the software manually when the car is in the shop.
There have been several OTA updates for the Mach-e, but I misspoke about a dead battery OTA. I should have said that Ford dealers will download the fix and update the affected modules.
 

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Discussion Starter · #15 ·
Report for faulty battery:
"The fault was identified as an intermittent cell failure in the 12 volt battery causing power drain and preventing the vehicle from starting.

A current draw test showed 0.03amp with all circuits switched off indicating there is no issue with parasitic drain causing a battery failure."

The dealership tells me they had the same incident in an EV6 over the weekend.
 

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Report for faulty battery:
"The fault was identified as an intermittent cell failure in the 12 volt battery causing power drain and preventing the vehicle from starting.

A current draw test showed 0.03amp with all circuits switched off indicating there is no issue with parasitic drain causing a battery failure."

The dealership tells me they had the same incident in an EV6 over the weekend.
So basically you got a bum 12v battery? Has a new 12v battery been installed and confirmed that your problem no longer persists?
 

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Report for faulty battery:
"The fault was identified as an intermittent cell failure in the 12 volt battery causing power drain and preventing the vehicle from starting.

A current draw test showed 0.03amp with all circuits switched off indicating there is no issue with parasitic drain causing a battery failure."

The dealership tells me they had the same incident in an EV6 over the weekend.
Can't even say I'm surprised. Wife and I were doing a 1000 mile unpaved road dual sport motorcycle route here. Middle of no where West Virginia we stopped to take a break. Go to get going again and the wife's bike wouldn't start. Dead battery signs. Sigh.. And that battery was only a year old and lives on a high quality tender.
 

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Interesting. I just saw a video a couple days ago showing that the system only charges the 12v battery during regen for efficiency. I wonder if this system is too aggressive, or if you just have a fault?
There is a separate 12v DC to DC inverter that kicks in to charge the 12v. This has to be coincidental or possibly boosting the 12v system in preparation for increase in disc braking?
 
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