Engine control error

[freinando]

Checked in the car to the dealership yesterday. Was told it would take about 2 weeks for a tech to even look at the car, apparently they have a backlog of cars to go through (ICE and EVs alike). I’m getting ready for this to be a multi-month ordeal. Not fun.
Was given a Macan S as a loaner which feels jerky in comparison to my Taycan. At least it has the sport exhaust and sounds nice…

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[joowon213]

Had same issues with 2020 Taycan Turbo. You need to replace the front inverter. Changing front inverter is pretty simple but Porsche always have to follow thier manual so it will take about 38 hrs with $275 hourly rate, labor alone will cost over 10k. It's not the transmission it's the inverter. If you do hard acceleration or do launch control you will experience the same issues again and again until your replace your front inverter.

 

[bastaycanturbo]

Had same issues with 2020 Taycan Turbo. You need to replace the front inverter. Changing front inverter is pretty simple but Porsche always have to follow thier manual so it will take about 38 hrs with $275 hourly rate, labor alone will cost over 10k. It's not the transmission it's the inverter. If you do hard acceleration or do launch control you will experience the same issues again and again until your replace your front inverter.

38h of labor? Thats a lot, can’t imagine how much the rear would be …

 

[freinando]

Reason it happens on gear change is that the ASG is limiting the total torque.
So during gearchange the torque is cut to the rear motor and the front motor goes to max output, and that is exactly when the fault happens.

An alternative way of more reliably triggering it would be putting the rear tyres on sand or gravel, front tyres on tarmac and then launching it.

I’m now coming back circle to this. So, when the downshift happens, all of the sudden the rear motor got more torque, causing the rear axle to spin faster, therefore causing the front tires to also spin faster, and the front motor is not ready for that sudden change. Did I get that right?

 

[prj]

I’m now coming back circle to this. So, when the downshift happens, all of the sudden the rear motor got more torque, causing the rear axle to spin faster, therefore causing the front tires to also spin faster, and the front motor is not ready for that sudden change. Did I get that right?

No.

During downshift the power is cut (significantly reduced) to the rear motor to allow the gearbox to shift.

The ASG is limiting total output. Since the rear motor is now unable to provide much output the front motor is ramped to 100% during the shift in an attempt to maintain the target system torque.

The error happens at full load (at first, then progressively starts happening at lower load), so this triggers the fault as during the shift the front motor is operating at 100% output.

If you had a tuned ASG this would happen every time you'd floor the accelerator, since both motors run at 100%.

 

[freinando]

Update. Technicians have been driving the car for the past 2 days, they haven’t been able to replicate the issue. I guess if they can’t replicate it, nothing can be done, even though I have photos/video evidence and codes are stored in the PCM?

They will keep trying for a couple of more days and revert with next steps. A bit frustrating.

 

[prj]

Update. Technicians have been driving the car for the past 2 days, they haven’t been able to replicate the issue. I guess if they can’t replicate it, nothing can be done, even though I have photos/video evidence and codes are stored in the PCM?

They will keep trying for a couple of more days and revert with next steps. A bit frustrating.

They don't need to replicate anything, the codes are stored in there, they can see them. Replication instructions are also in this thread. Those codes + photo is enough to open ticket at Porsche.

Your dealer is incompetent.

 

[Caraholic]

They don't need to replicate anything, the codes are stored in there, they can see them. Replication instructions are also in this thread. Those codes + photo is enough to open ticket at Porsche.

Your dealer is incompetent.

agreed

 

[freinando]

They don't need to replicate anything, the codes are stored in there, they can see them. Replication instructions are also in this thread. Those codes + photo is enough to open ticket at Porsche.

Your dealer is incompetent.

Apparently if they cannot replicate it, they cannot ask Porsche to pay for the repair in this case, given that this type of fault can be caused by many things. This os what the SA told me.

 

[Wivenhoe]

As you near the end of the warranty I guess the repair will be far more profitable to the dealer when you are paying versus what Porsche will pay them. I would ask the dealer to provide a copy of the codes they have that confirms no issue and then compare them with yours ?

 

[prj]

Apparently if they cannot replicate it, they cannot ask Porsche to pay for the repair in this case, given that this type of fault can be caused by many things. This os what the SA told me.

The fault on the display can be caused by many things, but the codes were stored in the controller - the list of faults + a photo of the display is sufficient to open a ticket.

 

[freinando]

As you near the end of the warranty I guess the repair will be far more profitable to the dealer when you are paying versus what Porsche will pay them. I would ask the dealer to provide a copy of the codes they have that confirms no issue and then compare them with yours ?

Still have 2+ years of warranty left, but needless to say I won’t own this car without a warranty.

 

[freinando]

Got the car back. No repairs done. They cleared the codes. Was told by the SA the moment it happens again to bring it in without an appointment.

 

[DerekS]

Got the car back. No repairs done. They cleared the codes. Was told by the SA the moment it happens again to bring it in without an appointment.

The lack of EV experience at repair centers is making me so disgusted with this whole experience.

If you can repro on demand can you have a tech do a ride-along? I had to do that to get them to take my fast-charging issue seriously. That has yet to result in an actual repair though.

 

[prj]

Just set it to normal mode and floor it at low speed. It goes into 2nd gear at 8km/h (5mph), you should be able to reproduce it if you let it kick down the gear at a low speed...

Or launch it so that the rear tyres have bad grip, that should reproduce it every time - spray them wet or something and keep the fronts dry.

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