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

[EVowner]

What I learned: I will never order a Cayenne EV without it being on a market for at least a year, and thorough perusal of forums to look for similar issues. Only when it is absolutely trouble-free will I order one.

To be honest I don't think you will have much better luck with any of the recently released EVs. Before getting my Macan I was actually seriously looking at Polestar 3 and Lotus Eletre.
Looking at their forums before pulling a trigger on Porsche I learned that both of them have their own plethora of SW and HW problems.

I did similar check on Macan and at the time of ordering back in May 2025 which was more than 12 months after car was released. At that time other than few outliers with really big if not catastrophic problems (which I believe were down to individual units which you will find in any brand and should be outright replaced) I have not seen any widespread big issue. Porsche to me based on what I saw seemed at the time as pretty safe bet as I hoped that their approach of not having flashy SW with OTA would mean that their SW will be pretty stable (main culprit of many problems in those other two or any other EV). I also hoped that they learned their lesson with Taycan architecture with way too many modules which are apparently nightmare to diagnose even today, as Macan should be much simpler in these terms. Also their brand is supposed to be quality oriented when it comes to hardware part of the car. Lastly I considered them as brand that will stand behind their product and do the right thing when something is not working as supposed to.

All that said if there was this particular thread back in May I would probably not have bought Macan and rather waited for something else. Battery issues on any EV is the biggest possible red flag to avoid certain model or brand similarly like engine problems on any ICE car. Owning mine Macan I also learned that many of mine assumptions about their brand were, at least based on my experience so far (I am still hoping that they will either fix my car or offer some sort of way to move to another car), not correct and other than very premium price tag and driving feel when everything actually works there is nothing special about it. Their cars in terms of quality seems to be on same downward trend of buggy SW (not having OTA does not mean that they are not releasing hotfixes it is just you wont get them unless you will visit dealer on monthly basis), cheap materials (cost savings on their end) and excuses for everything (again mainly cost savings on technicians who don't have time to be trained or properly diagnose something) that are present in any new car today. But that is just the world that we seem to live in today for some reason.

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[platypus]

I also hoped that they learned their lesson with Taycan architecture

It was my hope as well, and based on this thread (which is, in all fairness, a small group of self-selecting owners) it doesn't seem like they've this technology under control just yet.

Their cars in terms of quality seems to be on same downward trend of buggy SW

I see it as growing pains of a manufacturer that has been doing gas engines for the last 70 years, and is – like most other historical manufacturers – pretty bad at building software.

Despite these issues (which in my case aren't as bad as others in this thread), I still feel like the Macan was the best EV I was ready to buy.

 

[Daniel]

I will never order a Cayenne EV without it being on a market for at least a year, and thorough perusal of forums to look for similar issues. Only when it is absolutely trouble-free will I order one.

The drawback is that in my case, all these issues arose after 13 months without any problems.

A BMS "reset" and cell balancing resolved the sudden drop in SOC (and even SOH), drop confirmed by measuring the kWh count, with all due caution, using Carscanner.
Only a PCM reset resolved the route planner bug (better SOC at departure than at arrival).
All of this is quite disappointing....

 

[EVowner]

A BMS "reset" and cell balancing resolved the sudden drop in SOC (and even SOH), drop confirmed by measuring the kWh count, with all due caution, using Carscanner.

I find your post very interesting. Could you by any chance explain this BMS reset? Also which dongle/app is capable of displaying correctly data from Macan EV? From what I heard my understanding was currently there is no app that can make sense of its data in some meaningful way.

 

[Daniel]

I find your post very interesting. Could you by any chance explain this BMS reset? Also which dongle/app is capable of displaying correctly data from Macan EV? From what I heard my understanding was currently there is no app that can make sense of its data in some meaningful way.

The BMS reset was performed by my dealership on the same day as the "big update." I don't have any further details, except that I fully charged the battery before leaving the dealership.

This is my dongle, bought for my Taycan :https://www.amazon.fr/dp/B08NFLL3NT?ref_=ppx_hzod_title_dt_b_fed_asin_title_0_0
The Carscanner and Eflow app haven't been updated for the Macan, most likely due to Porsche's refusal. The Macan manual warns users about these on-board diagnostics.
The only potentially useful information is on the lower of this this screen , with a SCO of 37% :

 

[EVowner]

For the record:

29/1: 67%

3/2: 65%

6/2: 56%

One thing that I noticed recently when mine SoC drops while stationary started being bigger (although still not so drastic as yours) and it seems to be shown also on your photos is fact that during these bigger drops battery temperature is raising. Mine went from 11C to 15C while outside temp in garage barely changed.

This at least to me tells that either:
SW has no idea what battery is doing (meaning both SoC and battery temp number mean nothing) - I find this unlikely as car happily accepts charge when lover SoC than limit with measurable kWh going in so the drop in battery charge is real.

Car is actually in background during sleep really doing something for some reason which consumes energy - This option seems also weird to me, because mine even if plugged in to charger and set to direct charging seems to be unaware about any drop in SoC until the moment I unlock the car at which it realizes that it needs to charge again.

There is probably also third option with battery chemistry causing lose of charge on its own and that proces is generating heat - Since I am no battery expert I have no idea how likely is this or even if possible. But it would technically be in line with the fact that car is unaware about the drop in SoC until is woken up and is happy to accept charge once woken up. It would also explain why only some owners are seeing this behaviour while all of us are running same SW as it would point to some HW problem either in battery or some portion of BMS.

 

[platypus]

Well, the battery drain may have gone away (!) I charged the car to 90% for a road trip on Wednesday morning, and when I took it today (two days later), it was still at 90%. This has not happened since July. That said, it’s a bit early to call this a fix, so I’ll report back soon.

The two possible reasons, if this is actually fixed:
1. I disconnected the external battery for the dashcam, which the dealership had indeed forgotten to disconnect.
2. The latest software updates were installed by the dealership a week ago.

 

[Bustergordon]

I recently left my Macan for close to 6 weeks - the car went from 82% to 53% in that time.

 

[joeev]

Good news
I just left my car for 7 days and it didn't lose any charge (first time for my car). I don't know if it's because the v28.13 update or if the stars magically aligned with the moon, but hopefully it keeps up.

 

[FirstEV]

If you want to maintain the most SoC while you're away you do NOT want to check the car's status in the app frequently because this prevents the car from going into a deep sleep. You also want to make sure none of the keys are nearby.

This has also been confirmed by the head of service at my dealership. Since my car was in service for months without being driven, he specifically told me not to use the app so the car could stay “asleep.” He also made sure to switch it to “private mode” so I wouldn’t be able to check it in the app anyway.

It was obviously the right decision(I knew they chose to do that when the car disappeared from the app )

 

[Fly4ever]

I was almost certain that the app was triggering something in the car therefore was "responsible" for the drainage.While I was away several weeks ago,during the first 12 days I used the app once and the SoC went down.During the next 12 days the app was accidentally used once and again the SoC reduced.The last 15 days I didn't use the app at all, guess what...SoC remained stable.It doesn't seems as just a coincidence to me...!

 

[M324]

I personally can not confirm that the app is responsible for this. There are times where I do not use the app at all (for example during the night while the car is charging in the garage), but next time I drive the car the SoC decreased.

 

[EVowner]

Same here. I even removed app from phone and it had zero impact. Interestingly even when I do check the app it claims higher SoC than what car tells when I open the door most of the time.

Also for people claiming drain is caused by app. You know that 1% is 0.95kWh so computer in the car would need to stay on for several hours if not days to consume this amount of power.

 

[Fly4ever]

Interestingly even when I do check the app it claims higher SoC than what car tells when I open the door most of the time.

Also for people claiming drain is caused by app. You know that 1% is 0.95kWh so computer in the car would need to stay on for several hours if not days to consume this amount of power.

Always the app shows different SoC, almost every time shows higher and when I get back to the car and unlock it the app synchronize and shows the updated lower value.Same happens most of the times during charging processes,with the car locked the app shows a SoC from quite some time earlier but again when I get back to the car and unlock it, the data are suncronized with the car higher values.It's like the app has massive delays updating data either way.

In regards to what is triggered by the app and leads to a possible HV battery 1%/day drainage,it would be possible to be involved several car systems and modules besides just the car computer. Most likely there are systems in our cars which we don't have the adequate knowledge to know in which way they work.There might be some modules waking up when the app is used.There might be also modules/systems waking up on their own even without the use of the app.Didn't you ever heard your car making a bunch of strange electrical - and not only - sounds when switched off?Some are clicking, others are buzzing... sign there are certainly several things happening "in the background" all of which are consuming energy.

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