How can remotely force my Taycan 4S 2020 to charge the 12V battery?

[exilen94]

@prj has written extensively about how the HV battery charges the 12V battery. Take a look at some of his posts:

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https://www.taycanforum.com/forum/search/368380/?q=12v+battery&c[users]=prj&o=relevance​

Hmmm. Last time I came back, it told that the 12V battery was low

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[Scandinavian]

I volunteer as a test case now!
I had only planned to leave the car for just 3 weeks at home. But a change of plans has now resulted in the car being left for 9 weeks until we return to our home in January. Since the weather forecast when we left, warned for some severe thunderstorms a few days later, I did not plug in the AC in the car, nor connect any12 volt trickle charger. And a mother of thunderstorms occurred and knocked out all electricity for a few hours as predicted.

I know for sure that the car still was online for 2 weeks and a bit, but I had cancelled my Porsche Connect and after that I have had no contact with the car.

So hopefully the updated software in the car will ensure that the 12 volt battery will stay charged. Else I need to follow the procedure with reserve key and booster etc.
Will let you know mid January!

Happy New Year!

DISASTER HAS STRUCK

Now I can report back that the 12 volt battery has died in my car when it was left for 8 weeks. Whatever update the car received to address this issue clearly does nothing for the 12 volt battery.

Came back late last night and tried to open the car by the remote this morning. NADA: Dead! I suspected this to happen and easygoing to try the emergency opening and reset of the 12 volt battery. BUT the Emergency key fits nicely in the key hole but does nothing when turning the key either way. IT WILL NOT UNLOCK the driver side door!!! I have no idea on how to get into my car now.

Porsche Assistance have been called but will not come until tomorrow since the car is parked at home, and only if the service centre has capacity to receive the car. One in a queue of many I understood with my struggling French.

So much for all the talk of the main traction battery recharging the 12 volt battery until 20 SoC etc. My car had about 65% charge when we left. And this time I could not plug in the 12 volt charger. Just was not possible. Since I no longer have any contact with the car without the Porsche Connect subscription, I could not try to preheat to activate the car during this time.

Our BMW i4 had absolutely no problems at all firing up. It did not even give any warning about any low level of charge on the 12 volt battery either. ICE cars were no problem either.

What a nightmare of a car this TRASHCAN is!

 

[eddieterry]

The manual key lock is very, very stiff. When doing for the same reason as you I found I had to turn it really, really hard. It is interesting that so many owners have no problem and yet there is a significant number of us that do get this problem - my local Porsche centre is adamant that it is fixable by a software update, lets hope they are right.
Hope you get yours sorted on Monday.

 

[prj]

So much for all the talk of the main traction battery recharging the 12 volt battery until 20 SoC etc. My car had about 65% charge when we left. And this time I could not plug in the 12 volt charger. Just was not possible. Since I no longer have any contact with the car without the Porsche Connect subscription, I could not try to preheat to activate the car during this time.

So something is faulty on the car, as I said, I (and I am sure many others) have had zero problems leaving the car for a long time.

There is a recall/campaign for 12V battery sensor, but if your car was left for 8 weeks then it does not seem like that could have been applied, since it's newer than that? And it is also not applied OTA, requires a dealer visit.

 

[Scandinavian]

The manual key lock is very, very stiff. When doing for the same reason as you I found I had to turn it really, really hard. It is interesting that so many owners have no problem and yet there is a significant number of us that do get this problem - my local Porsche centre is adamant that it is fixable by a software update, lets hope they are right.
Hope you get yours sorted on Monday.

How far should the key be turned then. I can turn the key 90 degrees but after that it is a stop. I could not turn it any further with my cold hands and did not dare to use any extra aid or tool. I will leave that to the recovery guys so they can pay for it if it all goes belly up!

 

[Scandinavian]

So something is faulty on the car, as I said, I (and I am sure many others) have had zero problems leaving the car for a long time.

There is a recall/campaign for 12V battery sensor, but if your car was left for 8 weeks then it does not seem like that could have been applied, since it's newer than that? And it is also not applied OTA, requires a dealer visit.

Well if you have had no issues with leaving the car there clearly is something wrong. I have repeatedly asked the service guys if all updates have been implemented and that has been confirmed.

Will ask again though.

This Taycan has been in for so many faults, recalls and issues that it has been more than all my other cars together over 55 years of driving modern cars, company cars or private. Worst quality ever and now this plus all the navigation issues etc.

 

[prj]

Well if you have had no issues with leaving the car there clearly is something wrong. I have repeatedly asked the service guys if all updates have been implemented and that has been confirmed.

There is now a recall for the 12V battery sensor, I wonder if that solves the issue?

For the mechanical key not actuating - it worked fine in my heated garage when my OBC blew up, I wonder if it's slightly below freezing, if the lock has just frozen up.
Also I might recall this wrong, but wasn't it counter-intuitive how it opens as well? As in counter-clockwise to lock it and clockwise to unlock? Might be wrong though.

 

[eddieterry]

You are correct - I remember it needing to be turned exactly the opposite way to the expected way.

 

[prj]

You are correct - I remember it needing to be turned exactly the opposite way to the expected way.

That makes two then.

@Scandinavian try turning the key the other way? Exactly the opposite of how you expect it to work?

 

[Scandinavian]

That makes two then.

@Scandinavian try turning the key the other way? Exactly the opposite of how you expect it to work?

Understood, and I tried it both ways. The emergency key has a quite small head and I could just not turn it any further with my by then frozen fingers. As stated here it seems it is quite hard to turn the last bit. I could not do it then and did not want to use any extra tools for fear of damaging anything.

I have contacted Assistance so let’s see what happens. They offered me a rental car, Ford of some kind, which I declined. I am not stuck without the Taycan so I let them handle it now.

’’Will teport back once it has been fixed.

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