Engine control error

[freinando]

This has happened a couple of times in my 3 month ownership of this car (2022 4S). Both times under similar circumstances. Gunning the throttle while in normal mode in second gear. I have to stop the car, it judders, restart and on it goes.

My theory, the transmission is the culprit. I’m guessing when it’s time to downshift to 1st gear due to throttle demand, the transmission doesn’t shift fast enough/locks (see error codes) and the fault occurs. Today I tried in Sport mode to see if I can reproduce it, to no avail. I even tried changing modes between Normal and Sport to have that transmission gear change to see if it triggers it, nothing. Anyway, the transmission has a rough upshift that causes a vibration through the car, and a nasty clunk when downshifting when coming to a stop. I’ll take the car in for a check in 2 weeks, but wondering if someone has come across this error where the transmission was determined as the cause.

Sponsored

 

[udubfl]

https://www.taycanforum.com/forum/threads/explained-wna5-drive-system-control-fault.25777/

Maybe this ^?

 

[Caraholic]

Most likely will need a new inverter both my taycans did this and both needed a new inverter.

 

[prj]

Inverter fault in the front, has to be replaced.

 

[freinando]

Inverter fault in the front, has to be replaced.

What makes you say that? For example, yesterday I did a few hard accelerations, even launched the car, and it performed fine. I would think if the inverter was faulty, any hard acceleration would cause the issue?

 

[freinando]

https://www.taycanforum.com/forum/threads/explained-wna5-drive-system-control-fault.25777/

Maybe this ^?

I had seen this thread. What’s different is the OP mentions that it always happens under heavy acceleration. Also, my error codes don’t say anything regarding “torque” (used MapEV Diag so hopefully it is showing the proper reasons).

 

[Caraholic]

What makes you say that? For example, yesterday I did a few hard accelerations, even launched the car, and it performed fine. I would think if the inverter was faulty, any hard acceleration would cause the issue?

It’s interment doesn’t happen every time you floor it but that is what needs repaired.

 

[prj]

What makes you say that? For example, yesterday I did a few hard accelerations, even launched the car, and it performed fine. I would think if the inverter was faulty, any hard acceleration would cause the issue?

No it would not, because it also depends on the temperature of the electronics.

There is really nothing else to say, take it to the dealer, they will fit a new front inverter, your car will be fixed.

 

[bastaycanturbo]

Most likely will need a new inverter both my taycans did this and both needed a new inverter.

what was the labor and total cost of this? I presume car was under warranty, but maybe you had a glance at the numbers.

 

[prj]

The front one will probably be 4-6k.
Rear one could run you over 10k. It depends on what the labour is billed out as.

 

[bastaycanturbo]

Salty 2,7k€ for the rear part and 7k+ in labor is a hefty bill.

 

[freinando]

This car is a CPO with 3 months of original warranty still left. I have the upcoming appointment with the dealership for the end of next week. However, I’m second guessing whether I should take it in at all.

Reasons: I have been driving the car perfectly fine for the past 3 weeks without issues, albeit always in Sport mode since I still think the issue is somehow related to the downshift that happens when flooring it in Normal.

I will be given a loaner, but pretty sure it’ll be a base macan, and could be having to drive that for quite a while.

Worried this may cause more harm than good, with the lack of training, messing something else, etc…

I’m between a rock and a hard place atm

 

[prj]

This car is a CPO with 3 months of original warranty still left. I have the upcoming appointment with the dealership for the end of next week. However, I’m second guessing whether I should take it in at all.

Reasons: I have been driving the car perfectly fine for the past 3 weeks without issues, albeit always in Sport mode since I still think the issue is somehow related to the downshift that happens when flooring it in Normal.

I will be given a loaner, but pretty sure it’ll be a base macan, and could be having to drive that for quite a while.

Worried this may cause more harm than good, with the lack of training, messing something else, etc…

I’m between a rock and a hard place atm

Sticking your head into the sand is by far the dumbest thing you can do. This fault progresses and it will happen all the time eventually. By that time your CPO is over, and you're going to be left footing the bill.

 

[freinando]

Sticking your head into the sand is by far the dumbest thing you can do. This fault progresses and it will happen all the time eventually. By that time your CPO is over, and you're going to be left footing the bill.

Fair enough

 

[prj]

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.

Sponsored