Does your Macan EV keep SoC stable when left idle for a week or longer?

[dimaa_6abc]

Brought the car to the dealer, the service representative talked at length about the battery SoC, the car maintaining battery integrity, cited the manual, etc. They will do a software upgrade, but will not even contact the manufacturer about the SoC loss issues, and I have no way of making them do that. OK, this is my first and last Porsche then, I'm sure EV should not lose 1% of SoC per day, and I'm sure Porsche (and entire VAG group) knows that, it is just unable to make the EV the right way.

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[ChrisFromUK]

......... I'm sure EV should not lose 1% of SoC per day, and I'm sure Porsche (and entire VAG group) knows that, it is just unable to make the EV the right way.

My car has this 1% /day loss too but it seems from this forum poll that 69% of respondents don't have a SoC loss problem, so it's not something wrong with the design but our individual cars.

I'm going to try out the new major software update (I'm scheduled for 3 weeks time) and then pick it up again with the dealer if the problem remains.

Interestingly, I'm also getting another even newer software patch related to the PCM screen going blank - apparently we (in the UK) will be getting a letter in the post about this soon so it must be serious.

 

[dimaa_6abc]

My car has this 1% /day loss too but it seems from this forum poll that 69% of respondents don't have a SoC loss problem, so it's not something wrong with the design but our individual cars.

I'm going to try out the new major software update (I'm scheduled for 3 weeks time) and then pick it up again with the dealer if the problem remains.

Interestingly, I'm also getting another even newer software patch related to the PCM screen going blank - apparently we (in the UK) will be getting a letter in the post about this soon so it must be serious.

And I would like to know what is wrong, but it does not seem to be possible, at least no case of having this problem and then resolving it is reported in this forum. Maybe you will be the first, then please share the solution.

Regarding black screen - wife reported that she had it once, now car has 11K km, we drove it twice on 2800km trip where I was in the car with my wife, I saw zero issues. Car drives just great, the only grudge is absence of soft-closing doors (A6 e-tron sitting on the same platform has them, but does not have rear steering). But with SoC issue and dealer pushing it away as if everything is fine makes me remove Porsche from the list of future cars.

 

[Paris92]

I lost 1% overnight. Also, My wife started the car up to run an errand two days ago and the screen only had "Porsche" on it. It never moved past that, even after three restarts. Eventually it did after se walked away for a few minutes.

 

[byebye]

Before october 2025: 2/3 weeks idle in underground parking = max 2 or 3 % less
and to me it was a selling point compared to my old Tesla...

now, same conditions: at least 1% PER DAY...

What went wrong?

 

[dimaa_6abc]

Before october 2025: 2/3 weeks idle in underground parking = max 2 or 3 % less
and to me it was a selling point compared to my old Tesla...

now, same conditions: at least 1% PER DAY...

What went wrong?

My current theory is that it either tries to prepare the car for the daily departure, or preserves the battery. To confirm it, can you please answer two questions:

1. Do you have a daily departure configured on charging screen, or have you ever had one, even though now it is disabled or deleted?

2. Have you ever had a long enough trip with few rapid charges in succession?

Our Macan also started to lose SoC not from the very beginning, and it does have those two conditions. Hard to say which caused it.

 

[byebye]

1. Do you have a daily departure configured on charging screen, or have you ever had one, even though now it is disabled or deleted?

2. Have you ever had a long enough trip with few rapid charges in succession?

1. no, never
2. Yes, it’s my standard pattern of use, as I almost not use the Macan as a DD.

My theory is that some module has a problem that disable the deep sleep.

It was an issue on the earlier day of the macan, because of a diode which was not in the soecification range.
They’ve changed the module on all the macans…

to me it’s a new instance of this sort of problem..,

 

[Daniel]

1. no, never
2. Yes, it’s my standard pattern of use, as I almost not use the Macan as a DD.

My theory is that some module has a problem that disable the deep sleep.

It was an issue on the earlier day of the macan, because of a diode which was not in the soecification range.
They’ve changed the module on all the macans…

to me it’s a new instance of this sort of problem..,

Same problem here.
No drop in state of charge (SOC) after 2.5 weeks in Geneva airport parking in April, and suddenly 10% in 13 days in my garage in October.

Furthermore, with 40% SOC displayed today, the range is 116 km!!!
Even more troubling, Carscanner shows me 16975 Wh of "battery energy content", corresponding to 110 km according to my recent consumption , and a "maximum energy content of traction battery" of 49450 Wh!! As if I only had half the battery left (split into two 400-volt sections....?).

As @byebye i think something changed in october .
It is better to have very little confidence in the data from the PCM.

 

[Paris92]

I lost 1% overnight. Also, My wife started the car up to run an errand two days ago and the screen only had "Porsche" on it. It never moved past that, even after three restarts. Eventually it did after se walked away for a few minutes.

Update: This also happened to me yesterday... twice. All I needed to do was back the car out of the garage for a few minutes. The startup screen would not go past the "Porsche" screen... waited for a few minutes, turned car off, then tried again. Same thing. Third time it loaded past that screen. Battery % did not change overnight last night.

 

[dimaa_6abc]

It is better to have very little confidence in the data from the PCM.

With EV and scarcity of charging stations, you need to be confident that you will reach the next one. We were driving our Macan on a long trip, and at the first leg SoC was decreasing unbelievably slow (1% per 10km), then after 40% started falling down 1% per 2-3km. When plugged it at 40% on DC fast charger and reaching 70%, station said it sent ~20kWh. 1% is roughly 1kWh, so it must have been 30. Now tell me what to believe...

 

[Daniel]

With EV and scarcity of charging stations, you need to be confident that you will reach the next one. We were driving our Macan on a long trip, and at the first leg SoC was decreasing unbelievably slow (1% per 10km), then after 40% started falling down 1% per 2-3km. When plugged it at 40% on DC fast charger and reaching 70%, station said it sent ~20kWh. 1% is roughly 1kWh, so it must have been 30. Now tell me what to believe...

My Macan has a specific problem right now.

After three years with a Taycan and one with the Macan, the GPS SOC estimate upon arrival is reliable; you should trust it for your trips.

 

[dimaa_6abc]

OK, dealer just called me and said that on Friday they had difficulty applying software update, but today they succeeded. Among the modules which received the update, there was a high-voltage battery, and the update wiped out all the parameters the car remembered about it. This raises the hope that if my theory about going into protective mode for the battery after using too much rapid charge sessions is correct, the SoC loss will go away.

Next time I will try to use as many AC-charging sessions during the trip as possible (basically slow-charging at night rather than rapid charging and going to sleep assured that the car is ready for the next day, which I'm guilty of doing).

 

[TurboSpain]

Before october 2025: 2/3 weeks idle in underground parking = max 2 or 3 % less
and to me it was a selling point compared to my old Tesla...

now, same conditions: at least 1% PER DAY...

What went wrong?

October?

I'm not sure, but I suspect the drop in temperatures might cause that 1% daily loss. At least I've noticed it in mine. During the summer it was 0%, these days it's 1%.
Of course, the app isn't for checking the SoC; that data doesn't update until you unlock the car.

 

[byebye]

October?

I'm not sure, but I suspect the drop in temperatures might cause that 1% daily loss. At least I've noticed it in mine. During the summer it was 0%, these days it's 1%.
Of course, the app isn't for checking the SoC; that data doesn't update until you unlock the car.

Nop.

Underground parking, flat 18-20c all year.

besides, during last winter, it was 0% even when parked outside.

Something has definitively changed, in a bad way.

my car is at the dealership since 10 days for the red circle of death, and I’ve asked them to check/solve this abnormal idle phantom drain.

 

[dimaa_6abc]

OK, dealer just called me and said that on Friday they had difficulty applying software update, but today they succeeded. Among the modules which received the update, there was a high-voltage battery, and the update wiped out all the parameters the car remembered about it. This raises the hope that if my theory about going into protective mode for the battery after using too much rapid charge sessions is correct, the SoC loss will go away.

Next time I will try to use as many AC-charging sessions during the trip as possible (basically slow-charging at night rather than rapid charging and going to sleep assured that the car is ready for the next day, which I'm guilty of doing).

Dealer just called, in 3 days car lost 1% of SoC. Already better than 1% per day, but still not 0%. Will pick up the car today and check myself.

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