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2025 Porsche Macan Electric 4S — low-voltage battery warning after software update

CanyonFan50Community StarterJul 22, 20262025 Porsche Macan Electric 4SPhoenix
2025 Porsche Macan Electric 4S, about 8,200 miles. 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'd rather test this logically than start replacing parts.
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26 replies

PixelTraveler15Community StarterCommunity StarterJul 22, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2025 Porsche Macan, 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 “low-voltage battery warning after software update,” that was the fork that mattered for me. Time, temperature, and whether it's in gear are the notes that actually help a shop. I keep a notes app thread for this now.
PixelTraveler15Community StarterCommunity StarterJul 22, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2025 Porsche Macan, 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 “low-voltage battery warning after software update,” that was the fork that mattered for me. Time, temperature, and whether it's in gear are the notes that actually help a shop. If your situation is the opposite, ignore me. If that fails I'll eat the diagnostic fee.
ColdStartDaily13Community StarterCommunity StarterJul 22, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2025 Porsche Macan — site sharing and pack temp change the curve a lot. I'd do that before spending real money. Run the total, not the monthly, before you commit. No warning lights, which is why I'm documenting it.
EcoBuilder86Community StarterCommunity StarterJul 23, 2026permalink
Asking because it changes the advice: Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. I'd do that before spending real money. This is from a 2025 Porsche Macan in Phoenix with 8,200 miles. If they can't show the line item, I assume it's hiding. Next check is the cheap one I can do in a driveway.
EcoBuilder86Community StarterCommunity StarterJul 22, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2025 Porsche Macan so service can see what you saw. I'd do that before spending real money. I'd want that in writing, not as a promise. If it repeats twice more I'll book time.
EcoBuilder86Community StarterCommunity StarterJul 22, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2025 Porsche Macan, 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 “low-voltage battery warning after software update,” that was the fork that mattered for me. If they can't show the line item, I assume it's hiding. If your situation is the opposite, ignore me. Might be overthinking it, but I'd rather overthink than overspend.
QuattroLearner17Community StarterCommunity StarterJul 22, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2025 Porsche Macan so service can see what you saw. I'd do that before spending real money. If they can't show the line item, I assume it's hiding. Happens in gear, not in park, for what that's worth.
ColdStartDaily13Community StarterCommunity StarterJul 23, 2026permalink
I hear you, though I'd still want a second check. On the 2025 Porsche Macan, 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 “low-voltage battery warning after software update,” that was the fork that mattered for me. If it doesn't change the out-the-door or the repair estimate, it's noise. This is the filter I use when the thread starts repeating itself. Happens in gear, not in park, for what that's worth.
QuattroLearner17Community StarterCommunity StarterJul 24, 2026permalink
I hear you, though I'd still want a second check. Leave the alerts on the 2025 Porsche Macan so service can see what you saw. That's where I'd start. Verbal 'we'll take care of it' is not a plan. I'd rather be boring and correct. Not interested in a five-hour wait for a shrug.
CanyonFan50Community StarterCommunity StarterJul 22, 2026permalink
It did low-voltage battery warning after software update twice this week, both times after sitting. No change in mileage feel. Not interested in a five-hour wait for a shrug.
PixelTraveler15Community StarterCommunity StarterJul 23, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2025 Porsche Macan — site sharing and pack temp change the curve a lot. That's where I'd start. Time, temperature, and whether it's in gear are the notes that actually help a shop. Worth doing even if the car feels fine right now. Only after sitting overnight so far.
ColdStartDaily13Community StarterCommunity StarterJul 23, 2026permalink
That's a good start, but I wouldn't stop there. Try a second charger before blaming the 2025 Porsche Macan — site sharing and pack temp change the curve a lot. Then you'll know the next fork. I'd want a dollar figure or a measured spec, not 'should be fine.' Worth doing even if the car feels fine right now. I'll update if anything new shows up.
PixelTraveler15Community StarterCommunity StarterJul 23, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2025 Porsche Macan, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. Then you'll know the next fork. On “low-voltage battery warning after software update,” that was the fork that mattered for me. Time, temperature, and whether it's in gear are the notes that actually help a shop. Wrote this up on my lunch break.
QuattroLearner17Community StarterCommunity StarterJul 23, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2025 Porsche Macan — site sharing and pack temp change the curve a lot. I'd do that before spending real money. This is from a 2025 Porsche Macan in Phoenix with 8,200 miles. Verbal 'we'll take care of it' is not a plan. I've seen both outcomes, which is why I'd test instead of assume. I'd rather look cautious in this thread than stuck later.
QuattroLearner17Community StarterCommunity StarterJul 23, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. I'd do that before spending real money. If they can't show the line item, I assume it's hiding. Might be overthinking it, but I'd rather overthink than overspend.
EcoBuilder86Community StarterCommunity StarterJul 23, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2025 Porsche Macan — site sharing and pack temp change the curve a lot. I'd do that before spending real money. If they can't show the line item, I assume it's hiding. Worth doing even if the car feels fine right now. I'd rather pay for diagnosis than a second guess-repair.
PixelTraveler15Community StarterCommunity StarterJul 24, 2026permalink
Agree — and I'd add this: On the 2025 Porsche Macan, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. Then you'll know the next fork. On “low-voltage battery warning after software update,” that was the fork that mattered for me. Time, temperature, and whether it's in gear are the notes that actually help a shop. I'll update if anything new shows up.
QuattroLearner17Community StarterCommunity StarterJul 23, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. Then you'll know the next fork. I'd want that in writing, not as a promise. Make the next action something you can finish this week. Checking again after work.
CanyonFan50Community StarterCommunity StarterJul 23, 2026permalink
I went back under the 2025 Porsche Macan and it only happens after a heat soak, not on a cold start. I'll poke at it this weekend.
EcoBuilder86Community StarterCommunity StarterJul 23, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2025 Porsche Macan so service can see what you saw. Then you'll know the next fork. If they can't show the line item, I assume it's hiding. Not trying to scare you — just skip the expensive first guess. I'd rather pay for diagnosis than a second guess-repair.
EcoBuilder86Community StarterCommunity StarterJul 23, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2025 Porsche Macan so service can see what you saw. That's where I'd start. Verbal 'we'll take care of it' is not a plan. I'd rather be boring and correct. Trying not to diagnose from the couch.
ColdStartDaily13Community StarterCommunity StarterJul 23, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2025 Porsche Macan 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.' Wrote this up on my lunch break.
ColdStartDaily13Community StarterCommunity StarterJul 23, 2026permalink
Fair point. Counterpoint: Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. That's where I'd start. Run the total, not the monthly, before you commit. I'm keeping receipts and dates in one folder.
EcoBuilder86Community StarterCommunity StarterJul 23, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. Then you'll know the next fork. Verbal 'we'll take care of it' is not a plan. Next check is the cheap one I can do in a driveway.
ColdStartDaily13Community StarterCommunity StarterJul 23, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2025 Porsche Macan — site sharing and pack temp change the curve a lot. Then you'll know the next fork. This is from a 2025 Porsche Macan in Phoenix with 8,200 miles. I'd want a dollar figure or a measured spec, not 'should be fine.' Checking again after work.
QuattroLearner17Community StarterCommunity StarterJul 23, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. I'd do that before spending real money. This is from a 2025 Porsche Macan in Phoenix with 8,200 miles. If they can't show the line item, I assume it's hiding. Only after sitting overnight so far.
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