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Low-voltage battery warning after software update

CruiseMom94Community StarterDec 2, 20252023 Hyundai Ioniq 5 LimitedPhiladelphia
A software update finished overnight and this morning I got a low-voltage battery warning. Main battery is charged. Before scheduling service, is there anything safe to check in the app/service menu? I'm in Philadelphia. Any data points from owners would help.
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2023 Hyundai Ioniq 5 SEL

$459/mo

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42 replies

RustGarageCommunity StarterCommunity StarterDec 2, 2025permalink
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. Then you'll know the next fork. This is from a 2023 Hyundai Ioniq 5 in Philadelphia. If it doesn't change the out-the-door or the repair estimate, it's noise. Not interested in a five-hour wait for a shrug.
TireGeek70Community StarterCommunity StarterDec 2, 2025permalink
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. I'd do that before spending real money. On “voltage battery warning after software update,” that was the fork that mattered for me. Stop there until you know. I'm in no rush to be a hero on it.
BoostedCollectorCommunity StarterCommunity StarterDec 2, 2025permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Hyundai Ioniq 5 so service can see what you saw. That's where I'd start. This is from a 2023 Hyundai Ioniq 5 in Philadelphia. Post the numbers (or the code) and people can get more specific. I refuse to clear codes until someone else sees them.
RustGarageCommunity StarterCommunity StarterDec 2, 2025permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Hyundai Ioniq 5 so service can see what you saw. Then you'll know the next fork. If it doesn't change the out-the-door or the repair estimate, it's noise. If the story changes I'll post the new data.
BoxerNomadCommunity StarterCommunity StarterDec 2, 2025permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Hyundai Ioniq 5 so service can see what you saw. That's where I'd start. Run the total, not the monthly, before you commit. I'd rather be boring and correct. Doing the boring step first on purpose.
MileageShopper86Community StarterCommunity StarterDec 2, 2025permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Hyundai Ioniq 5 so service can see what you saw. That's where I'd start. This is from a 2023 Hyundai Ioniq 5 in Philadelphia. If you share a photo of the worksheet, easier to sanity-check. I'd rather look cautious in this thread than stuck later.
CruiseMom94Community StarterCommunity StarterDec 2, 2025permalink
Checked the easy stuff on the 2023 Hyundai Ioniq 5 and found one clue worth chasing before I book a shop. Next check is the cheap one I can do in a driveway.
QuattroGuy93Community StarterCommunity StarterDec 2, 2025permalink
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. That's where I'd start. Keep sale price, fees, and rate as three different conversations. I'm keeping receipts and dates in one folder.
TurboTechCommunity StarterCommunity StarterDec 2, 2025permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Hyundai Ioniq 5 so service can see what you saw. Then you'll know the next fork. Verbal 'we'll take care of it' is not a plan. This is the version I'd tell a friend.
V8MechanicishCommunity StarterCommunity StarterDec 2, 2025permalink
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. Stop there until you know. Not driving it hard until I know more.
MileageShopper86Community StarterCommunity StarterDec 3, 2025permalink
Asking because it changes the advice: Try a second charger before blaming the 2023 Hyundai Ioniq 5 — site sharing and pack temp change the curve a lot. That's where I'd start. This is from a 2023 Hyundai Ioniq 5 in Philadelphia. Post the numbers (or the code) and people can get more specific. Your commute and mine probably aren't the same, but the test still applies. Might be overthinking it, but I'd rather overthink than overspend.
TurboTechCommunity StarterCommunity StarterDec 2, 2025permalink
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 “voltage battery warning after software update,” that was the fork that mattered for me. I'd want that in writing, not as a promise. I refuse to clear codes until someone else sees them.
RustGarageCommunity StarterCommunity StarterDec 2, 2025permalink
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. That's where I'd start. I'd want a dollar figure or a measured spec, not 'should be fine.' Heat soak after errands is the other window.
CruiseMom94Community StarterCommunity StarterDec 3, 2025permalink
It did voltage battery warning after software update twice this week, both times after sitting. No change in mileage feel. I'd rather look cautious in this thread than stuck later.
TrackWeekend48Community StarterCommunity StarterDec 2, 2025permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Hyundai Ioniq 5 — site sharing and pack temp change the curve a lot. That's where I'd start. This is from a 2023 Hyundai Ioniq 5 in Philadelphia. Take it or leave it — that's what I'd do. I'll update if anything new shows up.
TrackWeekend48Community StarterCommunity StarterDec 3, 2025permalink
I hear you, though I'd still want a second check. On the 2023 Hyundai Ioniq 5, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. That's where I'd start. On “voltage battery warning after software update,” that was the fork that mattered for me. This is from a 2023 Hyundai Ioniq 5 in Philadelphia. Just my two cents from doing this recently. Video is ugly but it shows the hesitation.
MileageShopper86Community StarterCommunity StarterDec 4, 2025permalink
I'd push back a little: Try a second charger before blaming the 2023 Hyundai Ioniq 5 — site sharing and pack temp change the curve a lot. I'd do that before spending real money. Post the numbers (or the code) and people can get more specific. Your commute and mine probably aren't the same, but the test still applies. Parking it somewhere I can hear it better next time.
TrackWeekend48Community StarterCommunity StarterDec 2, 2025permalink
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. I'd do that before spending real money. On “voltage battery warning after software update,” that was the fork that mattered for me. Just my two cents from doing this recently. I already checked the easy fluid levels.
BoxerNomadCommunity StarterCommunity StarterDec 2, 2025permalink
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. Run the total, not the monthly, before you commit. I'm in no rush to be a hero on it.
CruiseMom94Community StarterCommunity StarterDec 2, 2025permalink
OP update: scanned the 2023 Hyundai Ioniq 5 again and still only have the one pending code, no new lights. I'll update if anything new shows up.
ApexRunnerCommunity StarterCommunity StarterDec 2, 2025permalink
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. I'd do that before spending real money. On “voltage battery warning after software update,” that was the fork that mattered for me. When does it actually happen? This is the filter I use when the thread starts repeating itself. Wrote this up on my lunch break.
ApexRunnerCommunity StarterCommunity StarterDec 2, 2025permalink
Asking because it changes the advice: Try a second charger before blaming the 2023 Hyundai Ioniq 5 — site sharing and pack temp change the curve a lot. That's where I'd start. Did the worksheet show tax yet? I've seen both outcomes, which is why I'd test instead of assume. Video is ugly but it shows the hesitation.
TruckTuner28Community StarterCommunity StarterDec 2, 2025permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Hyundai Ioniq 5 so service can see what you saw. Then you'll know the next fork. Parts cannon is a personality type I try to avoid. Checking again after work.
TireGeek70Community StarterCommunity StarterDec 3, 2025permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Hyundai Ioniq 5 — site sharing and pack temp change the curve a lot. I'd do that before spending real money. That's the whole play. I'd rather pay for diagnosis than a second guess-repair.
BoxerNomadCommunity StarterCommunity StarterDec 3, 2025permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Hyundai Ioniq 5 — site sharing and pack temp change the curve a lot. Then you'll know the next fork. If it doesn't change the out-the-door or the repair estimate, it's noise. I'll poke at it this weekend.
MileageNomad25Community StarterCommunity StarterDec 3, 2025permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Hyundai Ioniq 5 — site sharing and pack temp change the curve a lot. Then you'll know the next fork. Was this after sitting overnight? Happens in gear, not in park, for what that's worth.
TruckTuner28Community StarterCommunity StarterDec 3, 2025permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Hyundai Ioniq 5 — site sharing and pack temp change the curve a lot. That's where I'd start. This is from a 2023 Hyundai Ioniq 5 in Philadelphia. Parts cannon is a personality type I try to avoid. Your commute and mine probably aren't the same, but the test still applies. Not interested in a five-hour wait for a shrug.
BoostedCollectorCommunity StarterCommunity StarterDec 3, 2025permalink
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. Post the numbers (or the code) and people can get more specific. Make the next action something you can finish this week. Not interested in a five-hour wait for a shrug.
MileageShopper86Community StarterCommunity StarterDec 3, 2025permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Hyundai Ioniq 5 so service can see what you saw. That's where I'd start. Post the numbers (or the code) and people can get more specific. If this is nothing, great. I want that in data.
QuattroGuy93Community StarterCommunity StarterDec 3, 2025permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Hyundai Ioniq 5 so service can see what you saw. I'd do that before spending real money. This is from a 2023 Hyundai Ioniq 5 in Philadelphia. Keep sale price, fees, and rate as three different conversations. That's my plan before I call anyone.
RustGarageCommunity StarterCommunity StarterDec 3, 2025permalink
Fair point. Counterpoint: Try a second charger before blaming the 2023 Hyundai Ioniq 5 — site sharing and pack temp change the curve a lot. That's where I'd start. This is from a 2023 Hyundai Ioniq 5 in Philadelphia. I'd want a dollar figure or a measured spec, not 'should be fine.' Worth doing even if the car feels fine right now. Checking again after work.
CruiseMom94Community StarterCommunity StarterDec 3, 2025permalink
Update: the cheap test changed the symptom, so I'm not throwing parts yet. I'll poke at it this weekend.
TruckTuner28Community StarterCommunity StarterDec 3, 2025permalink
I'd push back a little: Match starting SOC and battery temp if you're comparing 2023 Hyundai Ioniq 5 charge sessions. I'd do that before spending real money. Monthly payment math is how wallets disappear. No warning lights, which is why I'm documenting it.
TireGeek70Community StarterCommunity StarterDec 3, 2025permalink
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. Then you'll know the next fork. That's the whole play. Cold start is when I can actually reproduce it.
TrackWeekend48Community StarterCommunity StarterDec 3, 2025permalink
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. Then you'll know the next fork. Take it or leave it — that's what I'd do. A day of patience here is cheaper than a wrong part. I'll update if anything new shows up.
CruiseMom94Community StarterCommunity StarterDec 3, 2025permalink
I went back under the 2023 Hyundai Ioniq 5 and it only happens after a heat soak, not on a cold start. Cold start is when I can actually reproduce it.
QuattroGuy93Community StarterCommunity StarterDec 3, 2025permalink
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. Keep sale price, fees, and rate as three different conversations. No warning lights, which is why I'm documenting it.
TruckTuner28Community StarterCommunity StarterDec 3, 2025permalink
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 “voltage battery warning after software update,” that was the fork that mattered for me. Parts cannon is a personality type I try to avoid. This is the filter I use when the thread starts repeating itself. Not driving it hard until I know more.
TurboTechCommunity StarterCommunity StarterDec 3, 2025permalink
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. I'd do that before spending real money. On “voltage battery warning after software update,” that was the fork that mattered for me. I'd want that in writing, not as a promise. Happens in gear, not in park, for what that's worth.
QuietMom90Community StarterCommunity StarterDec 3, 2025permalink
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 “voltage battery warning after software update,” that was the fork that mattered for me. Happy to compare notes if your setup is different. Wrote this up on my lunch break.
QuattroGuy93Community StarterCommunity StarterDec 3, 2025permalink
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. Then you'll know the next fork. Keep sale price, fees, and rate as three different conversations. I'd rather look cautious in this thread than stuck later.
TrackWeekend48Community StarterCommunity StarterDec 3, 2025permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Hyundai Ioniq 5 — site sharing and pack temp change the curve a lot. That's where I'd start. Take it or leave it — that's what I'd do. Worth doing even if the car feels fine right now. I'd rather look cautious in this thread than stuck later.
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