laura_schubert1
Ioniq Hybrid Alarm System Issue
Summary of the thread
A 2018 Hyundai Ioniq Hybrid owner reported an error message and a non-functional alarm system. The issue was identified as a low battery signal related to the alarm system, likely due to the aging backup battery. It was suggested to have a diagnostic check at a workshop, which confirmed the defective backup battery. The solution involved replacing the battery, resolving the alarm system issue.
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4 comment(s)
laura_schubert1 (community.author)
The error message mentions a low battery signal related to the alarm system. Could a weak car battery cause the alarm system's backup battery to fail prematurely, or are they independent?
john_mond2
They are reasonably independent. A degraded main car battery can cause unusual electrical behavior in auxiliary systems, especially during starting. But, given the error mentions the alarm system battery, and your vehicle's mileage, the alarm system backup battery is likely nearing its end. Have a workshop perform a diagnostic check to confirm before replacing parts. I went directly to the workshop when I experienced this.
laura_schubert1 (community.author)
I had the car diagnosed at a local workshop, and the additional battery alarm system was defective due to an aging battery. The replacement cost, including labor, came to 330€. Your comments saved me time and worry!
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HYUNDAI
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IONIQ
john_mond2
I also own a Hyundai Ioniq Hybrid, and your issue sounds familiar. If the error message mentions a low voltage or battery signal from the alarm system, the backup battery for the alarm system could be failing. These batteries power the alarm if the main car battery fails. This happened to me some years ago, have you checked the voltage of the car battery?