isabellasilber93
Ioniq auxiliary battery issue
Summary of the thread
A 2021 Hyundai Ioniq hybrid owner experienced an error message on the speedometer and electrical glitches, suspecting an issue with the auxiliary battery. The problem was identified as a weak 12V auxiliary battery that wasn't charging properly. After professional confirmation, replacing the auxiliary battery resolved the issue.
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4 comment(s)
isabellasilber93 (community.author)
Thanks for the reply! I haven't checked the voltage yet, but I probably should. Was it definitely the battery in your case? How did you figure it out exactly?
raphaelthunder7
Yep, turned out it was the battery. I initially thought it was something else, but after testing, the garage confirmed the battery was faulty. Given your symptoms, it might be worth getting it checked professionally. Could save you a headache down the road.
isabellasilber93 (community.author)
Thanks for sharing your experience! I took it to the workshop, and they confirmed it was the auxiliary battery. Replacing it cost me 290€, but at least everything seems to be working fine now. I really appreciate the advice!
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HYUNDAI
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IONIQ
raphaelthunder7
Sounds familiar. I had a similar issue with my old Peugeot 308, although it was a petrol engine, not a hybrid. It started with weird electrical issues and error messages. Eventually, the car wouldn't start at all. Did you check the voltage of your auxiliary battery? That might give you a clue.