Charging is not possible - Grounding device error

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Hi Scott, did you meanwhile get the grounding error problem fixed and - if so - what did you do? Thanks. I am experiencing the same problem.
I ended up bringing my charger to the dealership and I haven’t had the issue since. The car also got a software update at that time so I can’t be certain that the charger itself was fixed and it wasn’t fixed by the software update.
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I ended up bringing my charger to the dealership and I haven’t had the issue since. The car also got a software update at that time so I can’t be certain that the charger itself was fixed and it wasn’t fixed by the software update.
I ended up bringing my charger to the dealership and I haven’t had the issue since. The car also got a software update at that time so I can’t be certain that the charger itself was fixed and it wasn’t fixed by the software update.
So they changed your charger PMCC for a brand new one ?

Because I’ve experienced the same issue once so far, about a week ago(Have the car since end of August)
No explanation at all as to why it occurred. It gave me the error message when initiating the charging session.
I just ended up un plugging the PMCC from the 14-50 socket and replugging it. Has worked fine since then...
 

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Hi Scott, did you meanwhile get the grounding error problem fixed and - if so - what did you do? Thanks. I am experiencing the same problem.
I am also experiencing this problem with the PMCC going into a "grounding device error" condition. I have a timer and the general profile set. The timer is set to charge to 80% by 7am each day. The charge does succeed and initially it shows success and then within about an hour (the charger is still connected to the car) it faults. To resolve it I power the charger down and then back up. I've emailed Porsche but thought I'd see if anyone here has any bright ideas. The charger hardware version number is H13 (lucky 13!) and software 2914.

Does anyone not have this problem? If so, are you using a Profile or do you have that turned off? There is an option in the Profile for "Optimized Charging" that was on by default. I'm wondering if that is trying to be too clever so I've turned that off to see what happens. Thanks!
 
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So they changed your charger PMCC for a brand new one ?

Because I’ve experienced the same issue once so far, about a week ago(Have the car since end of August)
No explanation at all as to why it occurred. It gave me the error message when initiating the charging session.
I just ended up un plugging the PMCC from the 14-50 socket and replugging it. Has worked fine since then...
I don't think they gave me a new one. I believe they either updated the firmware on it or modified the software somehow. Either way, I have not had the issue since I got it back.
 

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I am also experiencing this problem with the PMCC going into a "grounding device error" condition. I have a timer and the general profile set. The timer is set to charge to 80% by 7am each day. The charge does succeed and initially it shows success and then within about an hour (the charger is still connected to the car) it faults. To resolve it I power the charger down and then back up. I've emailed Porsche but thought I'd see if anyone here has any bright ideas. The charger hardware version number is H13 (lucky 13!) and software 2914.

Does anyone not have this problem? If so, are you using a Profile or do you have that turned off? There is an option in the Profile for "Optimized Charging" that was on by default. I'm wondering if that is trying to be too clever so I've turned that off to see what happens. Thanks!
I am still struggling with that Grounding Error on my PMCC and have not been able to successfully charge from the 240V outlet yet. The PMCC does work when using a regular 110V outlet and the same 240V outlet works fine with my Mustart mobile charger (at 32A) which I bought to keep in the trunk of my Taycan. Does anyone know whether the PMCC uses/needs the fourth neutral wire of a NEMA 14-50 outlet?
 


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the PMCC has no way to ‘read’ the neutral wire - there is _NO_ conductor/connection in the NEMA 14-50 supply cable - the neutral isn’t even wired up!

see the picture below:

Porsche Taycan Charging is not possible - Grounding device error IMG_1985
 

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Does anyone know whether the PMCC uses/needs the fourth neutral wire of a NEMA 14-50 outlet?
the neutral is not used - and it’s not used in a physical sense in that it’s not even wired up!

personally between the overheating problems and the phantom ground problems - I’m finding the PMCC not even worth the time to mess with it - there are far better and cheaper alternatives - see my picture above and you can see there is not even a conductor for the neutral wire in the Porsche NEMA 14-50 supply cable.
 

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the PMCC has no way to ‘read’ the neutral wire - there is _NO_ conductor/connection in the NEMA 14-50 supply cable - the neutral isn’t even wired up!

see the picture below:

IMG_1985.jpg
Dave, thanks! That is what I figured as well. I am going to have the electrician come back tomorrow morning for one last check of the proper grounding. If that does not work, I will bring the PMCC back to the dealer for - ideally - a refund (unlikely) or another PMCC that hopefully works. The simple and inexpensive Mustart will carry me over meanwhile. Looks like there is a reason for the PMCC to now being a $0 option for model year 2020 Taycans...
 


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OP is the continuity of all the conductors in the extension cord OK?
 

r553

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Will check. Thanks!
If possible flex the cable while measuring continuity. You will need three hands..... Also if possible can you plug PMCC directly into 14-50 outlet?
 

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If possible flex the cable while measuring continuity. You will need three hands..... Also if possible can you plug PMCC directly into 14-50 outlet?
Thank you for this suggestion. I will check with my electrician tomorrow.
 

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This happened to me for the first time today. No way it could be outlet. I used the same outlet for 7 years to charge a Tesla Model S without any issues. I had it on timer last night. Going to try direct charging when I get home tonight and see it is a real issue or just a glitch.
 

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This happened to me for the first time today. No way it could be outlet. I used the same outlet for 7 years to charge a Tesla Model S without any issues. I had it on timer last night. Going to try direct charging when I get home tonight and see it is a real issue or just a glitch.
I'm having the same issue. Are you also using a profile and if so are you using "optimized charging"? I'm going to try turning the profile off tonight on the logic that maybe "optimized charging" is trying to be too clever, but will use the timer (to be able to stop charging at 85%) to see what happens.

Porsche Taycan Charging is not possible - Grounding device error 1603402656719
 

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Dave, thanks! That is what I figured as well. I am going to have the electrician come back tomorrow morning for one last check of the proper grounding. If that does not work, I will bring the PMCC back to the dealer for - ideally - a refund (unlikely) or another PMCC that hopefully works. The simple and inexpensive Mustart will carry me over meanwhile. Looks like there is a reason for the PMCC to now being a $0 option for model year 2020 Taycans...
(Hopefully) final update. The electrician came back for the third time to only then discover that the 100A 240V garage line’s ground in the main panel in the basement was not properly connected. The PMCC worked as advertised after fixing this. Couple of conclusions:
1) the PMCC - like other EV chargers - does not need or use the 4th neutral wire in a NEMA 14-50 outlet (Dave was right again),
2) the Mustart mobile charger happily charged along at 32A before the ground was fixed. I am not sure that is a good thing...
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