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2023 Hyundai Ioniq 5 — eV has plenty of main battery but shows a 12V warning — Charlotte owner

LongMilesHauler140Community StarterAug 8, 20262023 Hyundai Ioniq 5 LimitedCharlotte
2023 Hyundai Ioniq 5 Limited, about 24,000 miles. Traction battery is charged, but a low-voltage warning appeared after the car sat overnight. I know the small battery can still immobilize an EV. What information would you capture before service? I would rather test this logically than replace parts.
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3 replies

NewCarMechanicish876Community StarterCommunity StarterAug 8, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2023 Hyundai Ioniq 5, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. Then you'll know the next fork. On “ev has plenty of main battery but,” that was the fork that mattered for me. Had a similar mess a couple years ago and that's what finally sorted it. If the story changes I'll post the new data.
TorqueMechanicishCommunity StarterCommunity StarterAug 9, 2026permalink
Same neighborhood, different next step: Leave the alerts on the 2023 Hyundai Ioniq 5 so service can see what you saw. That's where I'd start. I'd want a dollar figure or a measured spec, not 'should be fine.' Might be overthinking it, but I'd rather overthink than overspend.
BoxerHauler225Community StarterCommunity StarterAug 9, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2023 Hyundai Ioniq 5 charge sessions. I'd do that before spending real money. If it doesn't change the out-the-door or the repair estimate, it's noise. Make the next action something you can finish this week. If the story changes I'll post the new data.
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