dennishoffmann3
Ioniq 5 additional battery alarm error
Summary of the thread
A 2022 Hyundai Ioniq 5 is experiencing an error related to the additional battery alarm system, likely due to the auxiliary battery being drained from age and high mileage. The error is generic, indicating a malfunction in the alarm system. It is suggested to have a workshop perform a thorough system diagnosis to prevent further electrical issues, which led to the resolution of the problem by replacing the drained battery.
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4 comment(s)
dennishoffmann3 (community.author)
Thanks for the reply. The error is pretty generic, just says 'Additional battery alarm system defective'. Is that what you saw with your BMW?
larskoenig84
Indeed. It started with generic errors too, and got worse over time. Given your Ioniq 5's mileage and the age of the battery, I'd strongly suggest having a workshop run a thorough system diagnosis. Ignoring a faulty battery signal can lead to further electrical issues down the line with these modern vehicles, and the repair cost might be worth it.
dennishoffmann3 (community.author)
Appreciate the advice, I'll take it to a shop. Cost me 330€, the battery was indeed drained.
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HYUNDAI
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IONIQ5
larskoenig84
Hello there! I sympathize with your frustration. It sounds like you're experiencing an issue with your auxiliary battery system! While it may be 'additional' it is an integral part of the alarm system. What you're experiencing may be because the battery itself is discharged, leading to a malfunction reported by the car's diagnostics. I had a similar headache with my old BMW 3 series a while back. The cold was draining the Battery, and everything was going haywire, what type of error messages is the car reporting?