⚡️ Home Charging Issues after Software Update? (Tracking Thread)

[Bauer83]

I appreciate the testing of my theory which has now been proven false - back to the drawing board as to why Porsche made this change...

thanks!!

Happy to try things. The more we dig at one point I would hope that it leads to a solution for us all.

I was of the view it was tied to voltage and did get a regulator. Will be testing that again when my car fails to initialize on the level 1 charging. A bit disappointed the regulator didn’t work for one member here as I was really hoping for a consistent cause and effect.

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[ColdCase]

Also the car asks for 2As to start and then once the handshake is successful it ramps to 40A. At least that is what my charger tells me. It tries 2A, then 1A, then 0.5A and then just says charging process stopped.

Wonder if the before update behavior is the same.

 

[Bauer83]

Wonder if the before update behavior is the same.

I’m hoping my loaner when I take my car in will be missing the update. But we will see

 

[dgkhn]

I appreciate the testing of my theory which has now been proven false - back to the drawing board as to why Porsche made this change...

thanks!!

I don't think this blows your theory. In fact, my bet is that you are essentially correct, meaning that the reason for whatever change was made with this update was to protect the OBC or some other aspect of the charging system, meaning to restrict the total power going to the car. In that case, it wasn't exactly a mistake, but the effect was more subtle than anticipated. One would think it would be possible for the car to check the voltage, and then limit the amperage to suit, but maybe that's too complicated. It's conceivable, as you implied, that there is an interaction between voltage detection and ambient or battery temperature also which would make the effect that much more difficult to diagnose. Nevertheless, someone wrote the code to do this and presumably it was reviewed and tested. It's conceivable that the testing phase was not comprehensive enough.

Regardless, my sympathies lie with people who feel this is supposed to be a premium brand that we are paying top dollar for and this sort of culture is inconsistent with that perception. IMHO, the even bigger problem, which is fairly consistent at Porsche. Apparently, it's total lack of transparency, which long-term is going to alienate the customer base.

 

[daveo4EV]

I don't think this blows your theory. In fact, my bet is that you are essentially correct, meaning that the reason for whatever change was made with this update was to protect the OBC or some other aspect of the charging system, meaning to restrict the total power going to the car. In that case, it wasn't exactly a mistake, but the effect was more subtle than anticipated. One would think it would be possible for the car to check the voltage, and then limit the amperage to suit, but maybe that's too complicated. It's conceivable, as you implied, that there is an interaction between voltage detection and ambient or battery temperature also which would make the effect that much more difficult to diagnose. Nevertheless, someone wrote the code to do this and presumably it was reviewed and tested. It's conceivable that the testing phase was not comprehensive enough.

Regardless, my sympathies lie with people who feel this is supposed to be a premium brand that we are paying top dollar for and this sort of culture is inconsistent with that perception. IMHO, the even bigger problem, which is fairly consistent at Porsche. Apparently, it's total lack of transparency, which long-term is going to alienate the customer base.

you are too kind and I agree with your analysis - and you hit the nail on the head and a line of reasoning I was thinking about anyways…

why was this code touched in the first place? changes in updates do not happen unless there is a driving factor - what was the factor that caused them to crack open this code base and make changes?

what was the "goal" of changing this code - that was already released, qualified and has been in the field now for almost 2 years…they had a purpose and they were trying to achieve something…what was it?

one wonders…

 

[daveo4EV]

also this is an update to 2024/2025 Macan's - does the MY'2026 Macan EV have the same problem?

 

[Dandar245]

I tried this, followed every step and used the same regulator…to no avail.

Has anyone else done this successfully?

How low are you dropping the voltage and which regulator did you go with. I am able to get this to work 100% of the time

 

[jergans]

How low are you dropping the voltage and which regulator did you go with. I am able to get this to work 100% of the time

I’ve dropped it to as low as possible before getting the low voltage error on the charger. I believe it’s right around 80. I’m using the Vevor auto variable transformer, linked above.

As I mentioned in another post, my home charging worked fine for a month after the update, then suddenly stopped. It’s possible I have another issue. Good luck getting Porsche to diagnose it

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