mattsrs

I don't have my car yet (its an order) but asked my Porsche advisor about this issue. He mentioned they have seen an issue with temperature sensor between charger and EV powertrain that had to be replace and was throwing CEL. Not sure if its related but overheating or sensitivity of sensor could be related.

crazycanucck

Just finished charging to full. CEL came back on immediately as I started - same code. Note, I charged it 3/4 full yesterday and drove 60+ miles on it and CEL didn't occur. I will keep documenting my charge cycles to see if there's a pattern here.

Lphiesmacks10

EV Powertrain replacement sounds pretty serious! Wonder if that would be covered under the eight year warranty.

mattsrs

Not power train replacement, just a temperature sensor

daveo4porsche

240 volts * 30 amps = 7,200 watts or 7.2 kW

the external EVSE (EVSE does not "push" power into the vehicle - the vehicle's onboard charger "pulls" voltage/amps into the car) the external charger can NOT overload the vehicle's in car charger…it doesn't work way - the car pulls the power it can handle from the external source…the Cayenne's charger pulls the power it's rated to pull based on what the external EVSE advertises - your Taycan's EVSE is advertising 40 amps - the Cayenne is saying great I only need 30 - so it pulls 30 amps (or 7.2 kW).

the external EVSE is simply an on/off switch that lets power flow - it does not regulate power - the onboard charger in the car is what determines "how much" power flows and tells the external EVSE to "open the taps and let it flow"…

this posting if you're interesting has a deep discussion of what an EVSE actually is…

https://www.taycanforum.com/forum/th...49/#post-71206

daveo4porsche

that would be a separate CEL code - but is unrelated to the U1022 codes I've been tracking with my '21 Cayenne and other's have experienced…

my assessment in owning a '21 Cayenne since April of 2021 and 5100 miles is this is a very very CEL happy vehicle - when in doubt throw up a CEL code so that the owner visits the dealer A LOT - so that Porsche can have maximum opportunity to market to these customers - it throws a lot of CEL's for a lot of different reasons…

the U1022 code is just one that in particular porsche is claiming they may fix in software at some future date.

daveo4porsche

these threads have some reasonably deep treatments and discussions of EVSE's and preparing for the future EV ownership home charging scenarios - they been well received and are also excellent if you're suffering from insomnia…

https://rennlist.com/forums/taycan/1...-charging.html
https://www.taycanforum.com/forum/th...-….2343/
https://www.taycanforum.com/forum/th...64/#post-17005

crazycanucck

Can confirm for me at least repro is in charging. Unplugged from full charge, U0122 CEL thrown on start and I cleared manually with OBD. Drove around for 20 miles, stopped and started car no CEL at all. Came home, plugged in and charged again. Turned vehicle on and CEL.

crazycanucck

scratch. @daveo4porsche is right. CEL comes on randomly. Happening while I was out without charging - same code.

gonna keep it on and take it to dealership next Friday. Will report back what they find.

mattsrs

Is anyone aware of similar CEL problems with Panamera? Given that E-powertrains are very similar, you'd think they should have similar issues. I searched the forum but nothing as serious as this thread is there

Maddie288

Wanted to share an update on the CEL issue we have been experiencing. My Porsche Service Manager called to tell me the '22 MY has been cleared of the issue. He said they have new software which is currently in testing for the '21 MY. He did not give me a date it would be available for updating my car, but he seemed to feel it was close (weeks not months). So, I am keeping my fingers crossed.

mattsrs

Wow that's a relief for MY22 orders. Thanks for sharing

daveo4porsche

thank you for the update @Maddie288 - I’m crossing my fingers that this is all true - and congrats to anyone ordering a MY’22 - this will be a nice fix once it lands.

crazycanucck

Back from service. Oddly enough for me, the CEL went away on its own just before the service appointment so they couldn't real time debug. However, the faults were all stored on the car and they pulled logs from that.

Good and bad news.

Good news is the technician was able to find out where the fault was coming from. It was throwing from the locking mechanism in the charger. I've circled image below where that locking mechanism is. I was told normally it would show a "locking or charging error" but in this case the logs show the component was trying repeatedly to communicate with the HV pack control unit then finally quit and threw a CEL. Hence that "Communication" related code I've been seeing. They tried reproducing the issue multiple times but couldn't. Car was safe to drive otherwise and keep an eye on it if it occurs again.

Bad news. No definitive repro so chances are it could happen again.

Drew_W

U0122 CEL is back along with P0606. My OBDII module shows 279.62 miles since DTC was cleared. Dealer said they are going to reach out to Porsche now...So basically 7 days later, the CEL popped back up.