MY26 software update (week 36) for MY24-25

[Bolt1323]

Did you get an error message about checking your charging infrastructure?

Yes

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[lukine]

Yes

Did you ever have an electrician come to your house to check your voltage coming into the house? I suspect yours is also above 240v.

May be worth looking into. I think the update changed the handshake parameters and anything above or below 240v exactly, will fail the initial handshake process.

 

[daveo4EV]

Did you ever have an electrician come to your house to check your voltage coming into the house? I suspect yours is also above 240v.

May be worth looking into. I think the update changed the handshake parameters and anything above or below 240v exactly, will fail the initial handshake process.

this is not true - my Macan (and other EV's) have successfully charged any where ins the range of 215V to 250V and anywhere in-between…

I've even charged successfully @ 208V which is pretty common North American "commercial" voltage and nearly ubiquitous at public ChargePoint L2 EVSE's…

voltage varies during the day based on grid conditions and quality of the electrical circuits - acceptable range is typically 200-250V for "220/240" circuits - and 105-125 volts for "110/120" volt circuits

designing a product that would fail to operate unless voltage is "exact" will fail to operate in 99% of commercial and residential installations and lack the necessary tolerance for normal and expected variation because the nationwide electrical grid is not a prices instrument.

 

[lukine]

this is not true - my Macan (and other EV's) have successfully charged any where ins the range of 215V to 250V and anywhere in-between…

I've even charged successfully @ 208V which is pretty common North American "commercial" voltage and nearly ubiquitous at public ChargePoint L2 EVSE's…

voltage varies during the day based on grid conditions and quality of the electrical circuits - acceptable range is typically 200-250V for "220/240" circuits - and 105-125 volts for "110/120" volt circuits

designing a product that would fail to operate unless voltage is "exact" will fail to operate in 99% of commercial and residential installations and lack the necessary tolerance for normal and expected variation because the nationwide electrical grid is not a prices instrument.

Okay, then how would you explain what’s happening with my car at my house? It stopped charging immediately after the update.

 

[daveo4EV]

Okay, then how would you explain what’s happening with my car at my house? It stopped charging immediately after the update.

well if the updates is rejecting charging because voltage variation then Porsche has a serious bug in their update

software changed and then your car can't charge - that's a fact - tying it to voltage is pure speculation…

porsche needs to diagnose and resolve the issue.

the update has introduced a regression with charging - the car no longer operates - Porsche nees to resolve this under warranty.

 

[daveo4EV]

well if the updates is rejecting charging because voltage variation then Porsche has a serious bug in their update

software changed and then your car can't charge - that's a fact - tying it to voltage is pure speculation…

porsche needs to diagnose and resolve the issue.

the update has introduced a regression with charging - the car no longer operates - Porsche nees to resolve this under warranty.

my voltage right now is 246 volts

my 2024 Macan Charges fine
my 2021 Cayenne eHybrid charges fine
my son's 2022 Tesla Model Y charges fine
my neighbor's Range Rover hybrid charges fine
my other neighbor's Audi Q5 hybrid charges fine
my friends Audi Teton charages fine
etc

if Porsche has updated their software to have strict voltage regulations they are going to brick _MOST_ (all?) of their fleet…and they will have to back out that change and release new software

although I highly doubt that voltage is the root cause here as to why your Macan is not charging - but hey it's software it could be anything

there is simple fact here: car is broken, it used to work, software update is the change - Porsche must fix it under warranty or buy the car back as defective and non-functional.

all of my equipment and vehicles work just fine at 246 volts - and I've seen my meter as low as 218 volts on a hot day in august in California when the grid is under extreme duress…

charging now…

 

[Bolt1323]

my voltage right now is 246 volts

my 2024 Macan Charges fine
my 2021 Cayenne eHybrid charges fine
my son's 2022 Tesla Model Y charges fine
my neighbor's Range Rover hybrid charges fine
my other neighbor's Audi Q5 hybrid charges fine
my friends Audi Teton charages fine
etc

if Porsche has updated their software to have strict voltage regulations they are going to brick _MOST_ (all?) of their fleet…and they will have to back out that change and release new software

although I highly doubt that voltage is the root cause here as to why your Macan is not charging - but hey it's software it could be anything

there is simple fact here: car is broken, it used to work, software update is the change - Porsche must fix it under warranty or buy the car back as defective and non-functional.

all of my equipment and vehicles work just fine at 246 volts - and I've seen my meter as low as 218 volts on a hot day in august in California when the grid is under extreme duress…

I was able to charge my 2025 Macan 4 with 252v and now I can’t ac charge my car at all including different houses it’s something with the software that mess up either the threshold or bricked some hardware in the car. But Porsche still blaming the house’s voltage as the problem.

 

[daveo4EV]

I was able to charge my 2025 Macan 4 with 252v and now I can’t ac charge my car at all including different houses it’s something with the software that mess up either the threshold or bricked some hardware in the car. But Porsche still blaming the house’s voltage as the problem.

yeah they are wrong - voltage can vary if voltage variation bricks the charging system or software well then we all need to get different cars…voltage from public grids power stations is never that precise - they are grasping at straws and trying to avoid warranty costs…

they can say what ever they want and they can choose not diagnose the problem - but they are still wrong, and if the car is that fragile none of us should own it.

good luck!!!

 

[daveo4EV]

I was able to charge my 2025 Macan 4 with 252v and now I can’t ac charge my car at all including different houses it’s something with the software that mess up either the threshold or bricked some hardware in the car. But Porsche still blaming the house’s voltage as the problem.

I'll betcha the dealer ship's voltage is "out of spec" also - they have no special power generators that deliver "perfect" voltage…

 

[daveo4EV]

I was able to charge my 2025 Macan 4 with 252v and now I can’t ac charge my car at all including different houses it’s something with the software that mess up either the threshold or bricked some hardware in the car. But Porsche still blaming the house’s voltage as the problem.

For 240 V residential service in North America (split-phase 120/240 V), the voltage variation follows the same ANSI C84.1 standard as 120 V—it’s just scaled to the higher nominal voltage.

Acceptable Voltage Variation for 240 V Service
Normal / Preferred Operating Range (ANSI C84.1 – Range A)
±5% of nominal

• 228 V to 252 V
• This is where utilities aim to keep voltage under normal conditions
• Most appliances and HVAC equipment are designed to operate continuously in this range

Extended / Short-Duration Range (ANSI C84.1 – Range B)
Used only infrequently (heavy load, switching events, abnormal conditions)

• 216 V to ~254 V
• Equipment should tolerate this briefly, but not continuously

Split-Phase Reality Check
Because 240 V service is made of two 120 V legs:

• Each leg should still be within 114–126 V
• Imbalance between legs should be small (usually <2–3 V)

If one leg is low or high while the other is normal, that points to a neutral or utility issue, not just normal variation.

Quick Summary

Category	240 V Range
Preferred (±5%)	228 V – 252 V
Extended (infrequent)	216 V – ~254 V
Typical utility target	~235–245 V

When to Call the Utility

• Sustained voltage below ~228 V or above ~252 V
• Large swings during normal usage
• One 120 V leg consistently higher/lower than the other

 

[Bolt1323]

yeah they are wrong - voltage can vary if voltage variation bricks the charging system or software well then we all need to get different cars…voltage from public grids power stations is never that precise - they are grasping at straws and trying to avoid warranty costs…

they can say what ever they want and they can choose not diagnose the problem - but they are still wrong, and if the car is that fragile none of us should own it.

good luck!!!

I probably been to the dealership 8+ times trying to get them to understand the issue they even came to my house and saw it for themselves yet still don’t want to do anything about. They took the car for two week let it sit outside in the cold, refused to let me take the car back as apparently “Germany techs might need data logs” which was untrue because when I pick up the car they accidentally told me they will NOW reach out to Germany. That’s when I lost it.

 

[daveo4EV]

I probably been to the dealership 8+ times trying to get them to understand the issue they even came to my house and saw it for themselves yet still don’t want to do anything about. They took the car for two week let it sit outside in the cold, refused to let me take the car back as apparently “Germany techs might need data logs” which was untrue because when I pick up the car they accidentally told me they will NOW reach out to Germany. That’s when I lost it.

you are right to be frustrated and need to continue to demand resolution - it's unacceptable for the vehicle not to charge - if Porsche can not resolve the issue then I would be looking for another vendor for my vehicle needs and getting legal help to sell the car back to Porsche or get the issue resolved.

voltage is is not the issue and if they are claiming it is they need to _PROVE_ it - not just say it's that's way.

good luck!!

I'd be deeply frustrated by now and looking elsewhere - another dealer/service or an entirely different vehicle.

you have every right to be pissed off - but they don't know what they are talking about and it's pure BS that voltage is the issue - now getting them to agree with that - yeah probably not going to happen

may be time to give up the vehicle and exit the situation if they can not resolve the issue.

 

[daveo4EV]

have them bring another Macan or any other EV to your home and have them show you that vehicle can not charge…

 

[Bolt1323]

you are right to be frustrated and need to continue to demand resolution - it's unacceptable for the vehicle not to charge - if Porsche can not resolve the issue then I would be looking for another vendor for my vehicle needs and getting legal help to sell the car back to Porsche or get the issue resolved.

voltage is is not the issue and if they are claiming it is they need to _PROVE_ it - not just say it's that's way.

good luck!!

I'd be deeply frustrated by now and looking elsewhere - another dealer/service or an entirely different vehicle.

you have every right to be pissed off - but they don't know what they are talking about and it's pure BS that voltage is the issue - now getting them to agree with that - yeah probably not going to happen

may be time to give up the vehicle and exit the situation if they can not resolve the issue.

Mostly likely will call Porsche NA on Monday explain the situation and see what they say. At this point I just want a buy back and rather go with another brand. I haven’t had one good experience with Porsche customer service, or dealership either as they were either rude or haven’t ever returned my calls when asking for updates on my car.

 

[Bolt1323]

have them bring another Macan or any other EV to your home and have them show you that vehicle can not charge…

They have already came to my house with a 2024 Macan turbo and was able to charge using my charger and their charger but couldn’t get my macan to charge. They are coming again on Monday to see it not charging, feels like they still don’t believe it which is also annoying because it seems like they haven’t even started on trying to resolve the issue and it’s been almost 3 months now.

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