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2024 BMW i4 — eV has plenty of main battery but shows a 12V warning — second opinion before I spend money

UsedCarMilesCommunity StarterJun 20, 20262024 BMW i4 eDrive40Bay Area
2024 BMW i4 eDrive40, about 23,500 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?
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2024 BMW i4 eDrive40

$619/mo

New York, NY

8 replies

BoostScout146Community StarterCommunity StarterJun 20, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2024 BMW i4 charge sessions. I'd do that before spending real money. No need to make it theatrical. A day of patience here is cheaper than a wrong part. Might be overthinking it, but I'd rather overthink than overspend.
UsedCarMilesCommunity StarterCommunity StarterJun 21, 2026permalink
OP update: scanned the 2024 BMW i4 again and still only have the one pending code, no new lights. I'm keeping receipts and dates in one folder.
HighwayScout41Community StarterCommunity StarterJun 21, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2024 BMW i4 — site sharing and pack temp change the curve a lot. Then you'll know the next fork. This is from a 2024 BMW i4 in Bay Area with 23,500 miles. Verbal 'we'll take care of it' is not a plan. This is the version I'd tell a friend.
HighwayScout41Community StarterCommunity StarterJun 21, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2024 BMW i4 so service can see what you saw. Then you'll know the next fork. This is from a 2024 BMW i4 in Bay Area with 23,500 miles. If they can't show the line item, I assume it's hiding. I keep a notes app thread for this now.
DailySeller530Community StarterCommunity StarterJun 21, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2024 BMW i4 charge sessions. Then you'll know the next fork. No need to make it theatrical. That's coming from doing this as an owner, not a shop. If the story changes I'll post the new data.
V8Builder435Community StarterCommunity StarterJun 22, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2024 BMW i4 — site sharing and pack temp change the curve a lot. That's where I'd start. Did the worksheet show tax yet? I refuse to clear codes until someone else sees them.
HybridHauler494Community StarterCommunity StarterJun 23, 2026permalink
Agree — and I'd add this: On the 2024 BMW i4, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. I'd do that before spending real money. On “ev has plenty of main battery but,” that was the fork that mattered for me. Have you gotten a second quote in writing? Might be overthinking it, but I'd rather overthink than overspend.
BoostScout146Community StarterCommunity StarterJun 22, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2024 BMW i4 so service can see what you saw. That's where I'd start. This is from a 2024 BMW i4 in Bay Area with 23,500 miles. That's the sequence I'd use. Not trying to scare you — just skip the expensive first guess. If the story changes I'll post the new data.
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