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18 replies

ShiftCollector423Community StarterCommunity StarterMar 31, 2026permalink
Cleared nothing. I want service to see the alert on the 2023 Hyundai Ioniq 5 first. Cold start is when I can actually reproduce it.
EVGuy113Community StarterCommunity StarterMar 31, 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. Then you'll know the next fork. If it doesn't change the out-the-door or the repair estimate, it's noise. Checking again after work.
OldSchoolNerdCommunity StarterCommunity StarterApr 1, 2026permalink
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. I'd do that before spending real money. On “first used-oil analysis: what matters,” that was the fork that mattered for me. Keep sale price, fees, and rate as three different conversations. I'll update if anything new shows up.
WrenchRoadie234Community StarterCommunity StarterMar 31, 2026permalink
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. Keep sale price, fees, and rate as three different conversations. I've seen both outcomes, which is why I'd test instead of assume. Cold start is when I can actually reproduce it.
OldSchoolNerdCommunity StarterCommunity StarterMar 31, 2026permalink
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. Write the result down so the next test isn't a repeat of the last one. Only after sitting overnight so far.
TrailGeek611Community StarterCommunity StarterMar 31, 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. That's where I'd start. This is from a 2023 Hyundai Ioniq 5 in Miami. If it doesn't change the out-the-door or the repair estimate, it's noise. I already checked the easy fluid levels.
RoadTraveler327Community StarterCommunity StarterMar 31, 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. I'd do that before spending real money. On “first used-oil analysis: what matters,” that was the fork that mattered for me. This is from a 2023 Hyundai Ioniq 5 in Miami. 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.
LongMilesWrench19Community StarterCommunity StarterApr 1, 2026permalink
Not convinced that's the whole story. 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. I'd rather pay for diagnosis than a second guess-repair.
ShiftCollector423Community StarterCommunity StarterMar 31, 2026permalink
OP update: scanned the 2023 Hyundai Ioniq 5 again and still only have the one pending code, no new lights. Happens in gear, not in park, for what that's worth.
BrakeRoadieCommunity StarterCommunity StarterMar 31, 2026permalink
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. Write the result down so the next test isn't a repeat of the last one. Your commute and mine probably aren't the same, but the test still applies. I already checked the easy fluid levels.
HybridMiles528Community StarterCommunity StarterMar 31, 2026permalink
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. If it doesn't change the out-the-door or the repair estimate, it's noise. Wrote this up on my lunch break.
ShopDad397Community StarterCommunity StarterMar 31, 2026permalink
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. Do that first. I'd rather be boring and correct. Trying not to diagnose from the couch.
RoadTraveler327Community StarterCommunity StarterMar 31, 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 “first used-oil analysis: what matters,” that was the fork that mattered for me. A shop burned me once by skipping that step. Video is ugly but it shows the hesitation.
LongMilesWrench19Community StarterCommunity StarterApr 1, 2026permalink
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. Stop there until you know. Not driving it hard until I know more.
ShiftCollector423Community StarterCommunity StarterApr 1, 2026permalink
It did first used-oil analysis: what matters twice this week, both times after sitting. No change in mileage feel. I'm in no rush to be a hero on it.
WeekendNomad775Community StarterCommunity StarterApr 1, 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. Just my two cents from doing this recently. Make the next action something you can finish this week. I'm keeping receipts and dates in one folder.
OldSchoolNerdCommunity StarterCommunity StarterApr 1, 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. That's where I'd start. On “first used-oil analysis: what matters,” that was the fork that mattered for me. Keep sale price, fees, and rate as three different conversations. No warning lights, which is why I'm documenting it.
OldSchoolCommuter670Community StarterCommunity StarterApr 1, 2026permalink
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. If they can't show the line item, I assume it's hiding. I'll poke at it this weekend.
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