[March 2026 Update] - Porsche's ONLY OTA update hobbles North American Taycans to max 9.6 kW charge rate…

[Techwizard100]

Is this the 11kW OBC neuter update under the cover of "battery diagnostics" to nip it to 9.6kW.

Is this the 11kW OBC neuter update under the cover of "battery diagnostics" to nip it to 9.6kW.

Hello are you actually saying you see a drop-in charging rate after install?

I have completed the OTA update and have all of the other updates on 24 STGTS. I’m still pulling 10.4. No change whatsoever.

I don’t think this is 100% correct in all cases. Perhaps we should take a poll on how many people are confident that they were before charging at 10.4 and now our reduced strictly because of this update. Before and after photos.

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[daveo4EV]

Hello are you actually saying you see a drop-in charging rate after install?

I have completed the OTA update and have all of the other updates on 24 STGTS. I’m still pulling 10.4. No change whatsoever.

I don’t think this is 100% correct in all cases. Perhaps we should take a poll on how many people are confident that they were before charging at 10.4 and now our reduced strictly because of this update. Before and after photos.

the update may only hobble OBC's in vehicle's that are known to porsche to have a problem - we'll never actually know if/how/why Porsche is limiting the max charge rate since we can't even get them to acknowledge they are doing it…

simple fact is the "in car" charge rate is not the raw power feed rate

if your in car rate shows > 9.x kW you're not limited to 40 amps

if you're limited to 40 amps you should see a value < 9.0 kw - closer to 8.4 or 8.6 kW shown in the vehicle while charging…

the mystery remains and Porsche still has not clarified what the goal maximum charge rate should be or is.

 

[Techwizard100]

the update may only hobble OBC's in vehicle's that are known to porsche to have a problem - we'll never actually know if/how/why Porsche is limiting the max charge rate since we can't even get them to acknowledge they are doing it…

simple fact is the "in car" charge rate is not the raw power feed rate

if your in car rate shows > 9.x kW you're not limited to 40 amps

if you're limited to 40 amps you should see a value < 9.0 kw - closer to 8.4 or 8.6 kW shown in the vehicle while charging…

the mystery remains and Porsche still has not clarified what the goal maximum charge rate should be or is.

“the update may only hobble OBC's in vehicle's that are known to porsche to have a problem” - it absolutely could be the case.
I just used the “tool” and got all green report on my battery. so I know it’s in great shape.

I will be with my contacts in the future, and I will get a direct answer.

 

[refazi]

“the update may only hobble OBC's in vehicle's that are known to porsche to have a problem” - it absolutely could be the case.
I just used the “tool” and got all green report on my battery. so I know it’s in great shape.

I will be with my contacts in the future, and I will get a direct answer.

it's not the case since all J1.2 and Macan EV charge at 40A (9.6kw) while at the time the car first launched they were speced as 48A (11kw)

 

[whitex]

So have we concluded if it is WST2 or WSS4 OTA update that allegedly limits the 11kW OBC to 9.6kW?

 

[whitex]

the update may only hobble OBC's in vehicle's that are known to porsche to have a problem

So that would mean all J1.2 Taycans and all Macan EV's have this problem known to Porsche then?

 

[whitex]

This thread reminds me of Tesla pulling shit like this in the past, causing a number of people to always refuse OTA updates, then Tesla forcing the sneaky ones without owner's permissions, so people going further actually modifying the car so that it couldn't apply updates (one very common way was to unplug one of the seat control motors, which caused the car to throw an error at the beginning of every OTA, which immediately aborted the OTA - Tesla OTA requires the car to have no active faults before applying, which is in fact a good way to avoid bricking cars).

My first sneaky OTA from Tesla was in 2013, barely a month after taking delivery of my Model S. The update was purely to appease crazy irrational media - it disabled my air suspension, disallowing it from lowering, because someone drove over a loose tow hitch on the road, causing the battery to catch on fire (many minutes later, after the car asked the occupants to exit, nobody got hurt).

 

[Techwizard100]

it's not the case since all J1.2 and Macan EV charge at 40A (9.6kw) while at the time the car first launched they were speced as 48A (11kw)

We’re specifically talking about J1.1. The older cars had 48 A. Now the question is have they been hobbled to 40.

 

[SergeyIndy]

We’re specifically talking about J1.1. The older cars had 48 A. Now the question is have they been hobbled to 40.

Given that you reported no impact, I will go ahead and accept the update and let you know if my 2023 gets nipped. My understanding that this update has some other improvements that appear to be material, so I will accept the penalty of 40Amp cap, but will call corporate to rattle them if that happens since we have no letter about it explaining the reasons. I think this is a 50/50 scenario but agree that a poll is needed with car model year and yes/no to 40Amp max cap applied that would be helpful to others.

 

[RED!]

Your definition of "broken" seems to exclude reduced functionality (so only physical parts breakage?). By your definition, a Taycan showing an Electrical Error that prevents the car from driving, is not broken, it's improved, because Porsche is protecting the driver from driving a car with shitty battery, DC2DC converter, or OBC. The car still functions well as a garage or driveway decoration, or a seat in which to sit down and relax, so not broken, right?

Fully agree! That’s why the jaguar is the safest car ever manufactured. It spend so much time sitting in your driveway becuase it wouldn’t start or run, or sitting in the dealership, same reasons, that it protected its owners from the risk of car crashes on the motorway! An example of the finest in automotive engineering!!

I’ve owned all sorts of exotic cars, but never a Ferrari, becuase my buddy who has nine of them explained to me that a critical item to keep in your glovebox is a Churchill cigar… so you can smoke it and enjoy how how beautiful your car looks… while you’re waiting for a flatbed tow.

That’s why I have an NSX and Porsches.

 

[RED!]

Given that you reported no impact, I will go ahead and accept the update and let you know if my 2023 gets nipped. My understanding that this update has some other improvements that appear to be material, so I will accept the penalty of 40Amp cap, but will call corporate to rattle them if that happens since we have no letter about it explaining the reasons. I think this is a 50/50 scenario but agree that a poll is needed with car model year and yes/no to 40Amp max cap applied that would be helpful to others.

Yeah, since I’ve updated I’ve also noticed a drop in projected range. 95% used to give me 300+ kms (322 at 100% is the Canadian advertised number) now I’ve lost 30 kms

 

[RED!]

Hello are you actually saying you see a drop-in charging rate after install?

I have completed the OTA update and have all of the other updates on 24 STGTS. I’m still pulling 10.4. No change whatsoever.

I don’t think this is 100% correct in all cases. Perhaps we should take a poll on how many people are confident that they were before charging at 10.4 and now our reduced strictly because of this update. Before and after photos.

I’d kill for your range!
See my picture? Similar range in Kilometers!!
I’ll admit that I’m in 32 degrees F weather, but it’s actually a 40% drop in range as a result???

 

[whitex]

Fully agree! That’s why the jaguar is the safest car ever manufactured. It spend so much time sitting in your driveway becuase it wouldn’t start or run, or sitting in the dealership, same reasons, that it protected its owners from the risk of car crashes on the motorway! An example of the finest in automotive engineering!!

I’ve owned all sorts of exotic cars, but never a Ferrari, becuase my buddy who has nine of them explained to me that a critical item to keep in your glovebox is a Churchill cigar… so you can smoke it and enjoy how how beautiful your car looks… while you’re waiting for a flatbed tow.

I hope this safety factor is reflected in Jaguar and Ferrari insurance rates. Doesn't bode well for Churchill cigar prices though.

 

[Voltaire]

We’re specifically talking about J1.1. The older cars had 48 A. Now the question is have they been hobbled to 40.

My J1.2 also charged at 48A/10.6KW when it was new. The major update that brought the PCM version to 4360 also reduced the maximum A/C charging speed to 40A/9.6KW. (That update was done at the dealer, not OTA). As others have mentioned, dealers either have no information or aren't allowed to reveal any reasoning behind this new limit.

I'd be fascinated if your contacts at Porsche are willing to reveal anything about this change, but I'd also be very surprised.

 

[Techwizard100]

My J1.2 also charged at 48A/10.6KW when it was new. The major update that brought the PCM version to 4360 also reduced the maximum A/C charging speed to 40A/9.6KW. (That update was done at the dealer, not OTA). As others have mentioned, dealers either have no information or aren't allowed to reveal any reasoning behind this new limit.

I'd be fascinated if your contacts at Porsche are willing to reveal anything about this change, but I'd also be very surprised.

It’s truly a puzzle. So the latest dealer updates did not change my J1.1 to 40A . I’m still charging at 10.5 as you see. I have had all of the latest updates done as of two weeks ago plus the over the air new update that just was done two days ago. My battery is very healthy. We’re trying to figure out if there’s a correlation between people with unhealthy batteries who have a J1.1 and seem to be getting a reduced charge cap.

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