[FREE] tCAN-Pro - TAYCAN BATTERY DIAGNOSIS FOR THE COMMUNITY

[ct14garage]

I have Chris’s application to perform a battery health check myself, but I didn’t find anything unusual. No real imbalance on a cold battery at 70% SoC. Could you please explain what this recall/repair report item means?

No idea... battery looks healthy!!

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[Bobcat]

I'm sure I'm screwing something up, but I'm getting a "no vehicle found on the network" error. The ENET cable shows green in the app, vehicle is on, cable seems to be plugged in all the way. I'm running the software through VMware Fusion on a Mac if maybe that's the problem, but it seems like the ENET is being seen by the virtual machine.

 

[Gru]

do you have a VPN ? it could be an issue

 

[Leccy61]

I'm sure I'm screwing something up, but I'm getting a "no vehicle found on the network" error. The ENET cable shows green in the app, vehicle is on, cable seems to be plugged in all the way. I'm running the software through VMware Fusion on a Mac if maybe that's the problem, but it seems like the ENET is being seen by the virtual machine.

I used fusion on a MacBook and had this issue. Make sure that the usb port is inactive on the Mac side. From memory its settings > network.

 

[Bobcat]

I used fusion on a MacBook and had this issue. Make sure that the usb port is inactive on the Mac side. From memory its settings > network.

That got the car to connect, but now I'm getting "Error: Sequence Contains No Elements". FWIW, MAPEV Diagnostics was able to run just fine. Anybody know what I'm doing wrong or needs changed?

 

[flyingfish]

Hello. I had same issue here. Using Parallel for Windows 11 on a MacBook Air M1. I was able to work around it by not using the shared network mode but the bridge mode for networking from the virtual machine.

 

[flyingfish]

And here my results. Delta = 0.159 Volts AFTER a rebalancing attempt that ended just yesterday. It looks like the repair from 3 months ago (2 modules) did not work too well. What do you think of battery isolation values? Am I driving a time bomb?

 

[Dee]

Thx @Administrator for the quick response.

 

[Dee]

And here my results. Delta = 0.159 Volts AFTER a rebalancing attempt that ended just yesterday. It looks like the repair from 3 months ago (2 modules) did not work too well. What do you think of battery isolation values? Am I driving a time bomb?

∆V = 0,02V average between the red cells, that's perfectly ok.
These cells are red cuz of the comparison to the green ones (which are also ok), that's why they are red.
So there's nothing dramatically wrong with your battery, they just put too good modules in.
Your isolation values are fine too.
Maybe @ct14garage can give a more educated opinion on this as I'm just a hobbyist.

 

[ct14garage]

And here my results. Delta = 0.159 Volts AFTER a rebalancing attempt that ended just yesterday. It looks like the repair from 3 months ago (2 modules) did not work too well. What do you think of battery isolation values? Am I driving a time bomb?

It's not as bad as it looks but also not good.

The old modules are balanced within themselves, which is good. And the new modules are also balanced within themselves, which is also good.

According to Porsche at least.

According to any other EV battery manufacturer Tesla, CATL, BYD, when replacing cells they should always be capacity matched to the current ones.... But hey....

 

[flyingfish]

Thanks to both of you. I do not understand the isolation values being OK. seem very low to me?

 

[Dee]

Thanks to both of you. I do not understand the isolation values being OK. seem very low to me?

What do you mean by "low"?
10.000Ω isn't low.
Most important one (Isolation Resistance Battery on the positive terminal) is ok
I recall it should be >8KΩ.
This is mine:

They're all like that in this topic (at least the good ones).

 

[Taycan4S_UK]

Looks healthy? MY21 - last summer dealer did SOH and it was reported 92%.

I did not see SoH in this program.

 

[flyingfish]

It's not as bad as it looks but also not good.

The old modules are balanced within themselves, which is good. And the new modules are also balanced within themselves, which is also good.

According to Porsche at least.

According to any other EV battery manufacturer Tesla, CATL, BYD, when replacing cells they should always be capacity matched to the current ones.... But hey....

Thank you Dee & ct14 Garage. I just redid the test with 100% SoC.
Notably, while the car and the Porsche app are both showing SoC =100%, TcanPro says less. According to my AI advisor (Gemini), this is the telltale of Porsche's software capping charge while displaying "battery full". Next is to test at very low SoC to see how much capacity the software is hiding at the "empty" end. Makes sense?

 

[Manni55TaycanRWDplus]

Ich beobachte, dass das BMS des Taycans nicht so gut funktioniert wie ein Tesla BMS.
Ich fahre schon seit 2019 Tesla Model S, 2023 Model Y und seit April 2025 Porsche Taycan RWD. Bei meinem Taycan wurde im März 2025 ein Batteriemodul erneuert. Anfangs hatte das BMS die Spannung des neuen Moduls ein paar Mal abgesenkt, aber dann nicht mehr!!!
Nach 30 T Km hat das Modul immer noch dauerhaft zu viel Spannung.
SOC 100 % +10 mV SOC 2 % +150 mV.
Auch ein langer Prozess um sich komplett anzugleichen.
Tesla BMS hat immer das ein Modul mit mehr Spannung abgesenkt.
Nach 30 TKm hat sich das neue Modul perfekt eingefügt.
Ich weiß nicht, dass es so kompliziert sein soll, eine perfekte BMS-Software zu programmieren.
BMS gibt es nicht seit Gestern.
Ein Armutszeugnis für Porsche.
LG Manni

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