Suggestions on Getting Plug and Charge Working Again 2022 CT4

[Spyerx]

Hi -

If there is a thread or post where someone has figured this out please point me, tried searching, this forums search is not amazing...

I have a 2022 CT4. Took delivery in Jan 22. Plug and charge on EA worked fine for a year (well as fine as EA works). Then my contract expired (you have to renew annually). So I re-added it to my online services and I am supposed to be good.

Well, since then, plug and charge never works. Ever. But activating in-app does.

What happens: Plug in, it connects to vehicle, the processing payment message comes up, then it says "payment failed"

My My-Porsche App shows a valid charging service date and valid contract
I can activate the charger manually in the my-porsche app, plug in, and it will charge (and I don't get charged a fee)
In the car, it shows a valid charging contract in the services
I tried logging in and out of my ID on the car
The 'enable plug and charge' option IS checked, and I tried checking and unchecking it
I tried deleting my ID and adding it again on the car, the only thing this did was cause transactions in the my porsche app to actually start showing again - are we getting somewhere?? Because I have used the charge service a fair bit and all my transactions after the contract renewed are gone, and no new ones showed up.

So today I was at an EA station, and have a few mins downtime, so I called EA - the lady was very nice, but she could only open a ticket. She saw the payment denied on the station but could not see why.

So then I called porsche. The tech I talked to seemed very knowledgeable and had me delete my ID and add it. He said he believe the ID token in the car is somehow not linking to my account automatically (I guess the charger pulls this) He suggested trying a PCM reset if the other things dont work. But warned I'd have to setup a bunch of stuff again... ugh. He also checked my account, sees it is setup right on their end, he also saw the denied payment...

Anyway, any other suggestions?

he said if the PCM reset doesn't work, call back and they will open up a trouble ticket with the engineers in Germany.

Sponsored

 

[WasserGKuehlt]

Sounds like you’ve done a good bit of debugging. The tech is probably right, there’s a stale token/cert cached in the car, which would need to be flushed out. If Porsche see the denied status at their end, in principle they should know exactly why - is there a mismatch between subscription and car, or there’s an expired ‘object’ being used in the flow..

Note that the car’s “credentials” are renewed over the cellular network, (speculation begins here) and presumably there is a “renewal token” that’s used for signing/issuing access tokens (on demand, for instance when charging). When/if the car is out of coverage long enough, that renewal token will expire, and so any stale/outdated claims will stop being inserted into the access tokens. Bringing the car back online will cause a re-issuance of the renewal token, and everything should be right as rain. (That’s why the tech suggested removing and re-adding your id, but since that hasn’t changed I suspect the renewal token was still considered to be valid.)

How long is long enough is the key question. I’d imagine a day should suffice. My one data point was a 3-day trip to Canada, where the car lost its connection (I suppose it doesn’t do roaming). On the leg up, P&C worked fine - including at Electrify Canada; on the leg down, it no longer worked - on either side of the border. Good luck, and please post back here any additional details you may learn.

 

[AndiL]

Resetting the PCM will remove the Plug & Charge Token from the vehicle allowing a new one to be installed. To install a new token you might need to plug the Taycan into a Plug & Charge compatible DC station and authenticate once with your Porsche charging card. That should then trigger the installation of a new token and association of your Taycan with your charging card.

@WasserGKuehlt Installation of these tokens/credentials on the Taycan are done via the charging station. That's what I had to do. Other vendors associate the charging card to the online account and the install it over the cellular network. But to my knowledge Porsche doesn't do this (yet).

 

[Raphie]

Mail Porsche Online Support, the team will sort you out OTA
[email protected]

 

[Tooney]

None of this should be necessary after renewing your charging contract.
By "reset PCM" do you mean using the PCM option to reset it to factory settings?
If PCNA cannot resolve, other possible options are:
--two finger reboot of PCM
--briefly disconnecting 12v battery
--dealer redoing registration and pairing process as described in TSBs relating to restoring datacomm connection.

edit: My experiences were that after PCNA "opens trouble ticket with Germany", I had to keep calling PCNA to check on status - PCNA did not contact me. It took 1-2 weeks to get responses.

 

[Spyerx]

I'll be doing a PCM factory reset as next step. (this is an option in the PCM)

I have a feeling I got caught in a transition zone, as in mid January (per the tech I talked to at Porsche), Porsche and EA were having all sorts of issues with P&C, and that is exactly when my contract renewed.

Thanks for the email link, I'll reach out there after I try this next step.

The data connection on my car works fine. I have no other issues or data or pcm issues with the car.

This very much seems to be: EA can identify my car, use that identification to tie to a valid pay account, and authorize the charging.

The fact I can start a charge by manually activating the charge session in the my porsche app says one side of this equation is working.

 

[WasserGKuehlt]

I'll be doing a PCM factory reset as next step. (this is an option in the PCM)

This very much seems to be: EA can identify my car, use that identification to tie to a valid pay account, and authorize the charging.

The fact I can start a charge by manually activating the charge session in the my porsche app says one side of this equation is working.

The flow would have to be like this:

- the car (on your behalf) requests the EA station to start a charge; mutual auth here between car id and station
- the EA station authenticates itself to EA backend and verifies the “payment” - ie the station has no concept of PnC itself. This request would have to capture enough of the client’s credentials - it could be a simple reroute or a wrapped token (composite identity of EA station + car/you)
- the EA service would likely call a Porsche backend, so it can attest the car’s identity and to verify the subscription
- Porsche does something and returns Y/N.

now, that’s a lot of authentication and live calls, so it’s likely some of these are “optimized away” with cached tokens, signatures, signing keys (EA could in principle validate the car + sub itself), subscriptions etc. But it always starts with the car, so if it stopped working the car’s creds need to be flushed/renewed.

Porsche is being a bit disingenuous by saying it all looks good on their side - either they’re stonewalling, or they have a gap in diagnostic traces.

(edit) as @AndiL pointed out above, a successful session may also result in a PnC token (after the flow above) being stored in the car. And this is what may be now expired, and the P backend simply rejects the request to authorize.

 

[Spyerx]

Ok. Did factory reset on pcm. Logged in and most settings came back, a few like homelink and gps lift did not.
Ran over to closest ea station and it worked!
So will try at couple others but the reset seems to have fixed the token issue the Porsche tech thought it was.

Sponsored