Just got a Transmission fault warning. Anybody know what it is?

[f1eng]

Just got this:

It happened first yesterday evening on my way home from dropping off my daughter after driving a mile or two.

I drove it again this morning to see if it had had a miraculous reset and again after a mile to so the alarm came up, and on the way home it came on almost straight away.

It seems to be related to the regenerative braking since it happened from “cold” at about the distance regenerative braking usually starts and on the second run today as soon as I touched the brakes and regenerative braking seems disabled, though the liftoff slowing like a ICE car simulation stays as normal, so related to brake pedal itself.

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[Tooney]

Here are two old TSBs mentioning transmission faults. Only TSBs with that in the title.

https://static.nhtsa.gov/odi/tsbs/2020/MC-10177949-0001.pdf
https://static.nhtsa.gov/odi/tsbs/2020/MC-10180485-0001.pdf

 

[f1eng]

Here are two old TSBs mentioning transmission faults. Only TSBs with that in the title.

https://static.nhtsa.gov/odi/tsbs/2020/MC-10177949-0001.pdf
https://static.nhtsa.gov/odi/tsbs/2020/MC-10180485-0001.pdf

Thanks, yes, I saw the first but it doesn’t seem to match what I have, the second is a stop driving one too..

 

[TXSchnee]

I found this thread by googling your error, it is older, apparently related to rodents chewing on wire harnesses. Looks like a visit to the service department is in order. Edit: apparently the other forum is a banned site it was Taycan EV Forum dot com that I found, pictures of error matched what you are seeing.

 

[f1eng]

Contacted my dealer and got an appointment for them to read the error codes on 1st August.
Since "adaptive driving" is permitted I can take it myself.

It seems the only thing I am missing is brake regeneration which is MIA.

 

[Dee]

Actually, it's a good error: it can be reproduced as far as I can see in your write-up.
That's always better than a random error.
Good luck.
I'm sure this can be addressed.

 

[f1eng]

I'm sure this can be addressed.

Me too, though I had rather had no faults!

I have bought cars new for 50 years now and had very few faults a leaky actuator in a Mercedes 500SL roof actuator being the only one I can think of at the moment, and only when the car was older.

So Porsche not doing as well as Mercedes, Ferrari and Toyota for me...

My friends all took the p*ss when I bought a Ferrari 355 spider rather than a 911 (993) but it has been reliable and I still have it since it has a great sound, 6-speed gated gearbox and the only driver over-ride is ABS.

 

[f1eng]

So my appointment to have this checked out was yesterday.
I had driven the car slowly a couple of miles 3 times between the first experience and taking it in to make sure it wasn't a spurious that would go away on its own and the warning came up each time so I decided not to use the car in case something worse was instigated by further use, anyway the "adaptive driving" felt weird with no regen braking and speed hunting at steady throttle.

I set off from home to the garage about 20 miles away and the warning came up after about ½ mile. Another mile further on there is a narrow crossroads in a hollow with poor visibility and when I accelerated across there was a clunk and the car self-mended, the warning disappeared. The rest of the journey it drove normally and the garage could find no current fault logged in the control units and it was fine on test drive.

 

[tigerbalm]

and the garage could find no current fault logged in the control units and it was fine on test drive.

I cannot understand if a car has logged a fault to such an extent that it shows up on the driver console that there is no fault history logged. Though it has been reported on these forums many times.

Now you are left wondering if/when it's going to re-occur. I'm not sure how I'd feel about all that.

 

[f1eng]

I cannot understand if a car has logged a fault to such an extent that it shows up on the driver console that there is no fault history logged. Though it has been reported on these forums many times.

Now you are left wondering if/when it's going to re-occur. I'm not sure how I'd feel about all that.

There were old faults he could see, apparently, but none current and he couldn't tell what the problem might be from the cleared faults that were stored.

 

[WasserGKuehlt]

I cannot understand if a car has logged a fault to such an extent that it shows up on the driver console that there is no fault history logged. Though it has been reported on these forums many times.

Taycan - it’s one of a kind.. happened to me earlier today, literally as I drove off after posting an “all is well” message on a thread here. The message said “emergency trunk release failure - possible to drive on”, and disappeared as I pulled over immediately. I spent a few minutes looking all over the PCM, and there was no trace of it.

Phantom messages disappearing from the UX are fine - we wouldn't want to obsess about an obsolete warning/error; there being no audit trail of past errors for diagnostics is unacceptable.

 

[f1eng]

Taycan - it’s one of a kind.. happened to me earlier today, literally as I drove off after posting an “all is well” message on a thread here. The message said “emergency trunk release failure - possible to drive on”, and disappeared as I pulled over immediately. I spent a few minutes looking all over the PCM, and there was no trace of it.

Phantom messages disappearing from the UX are fine - we wouldn't want to obsess about an obsolete warning/error; there being no audit trail of past errors for diagnostics is unacceptable.

My message persisted every time I drove it for 4 weeks and showed on the PCM.
It was just on the way to the garage it disappeared...

 

[tigerbalm]

My message persisted every time I drove it for 4 weeks and showed on the PCM.
It was just on the way to the garage it disappeared...

And if its true that there is no evidence for the warnings in the car's log as accessed by PIWIS 3 computer – then that really is a shockingly poor level of software engineering. So poor, I'm struggling to believe it – but as mentioned, not the first time we've heard this.

Also, from how you described it – it felt like perhaps something mechanical happened/shifted back into place. That still sounds like it warrants investigation – however, if there is no clue from the logs even what component was throwing the errors – I can understand reluctance to start debugging it.

I am going to start making some enquiries about Taycan, PIWIS 3 and historical log retention. Will report back what I find out!

 

[f1eng]

Also, from how you described it – it felt like perhaps something mechanical happened/shifted back into place.

I think so too.
The technician said he checked the clutch operation and it was normal.

 

[Scandinavian]

I set off from home to the garage about 20 miles away and the warning came up after about ½ mile. Another mile further on there is a narrow crossroads in a hollow with poor visibility and when I accelerated across there was a clunk and the car self-mended, the warning disappeared. The rest of the journey it drove normally and the garage could find no current fault logged in the control units and it was fine on test drive.

Interesting that they had no trace of the fault in the logs.

Out of curiosity, did you switch off and lock the car when you arrived at the dealer?

I had a lot of trouble during 2022 and every time I v]came to the dealer there was no trace of anything. Then once when I had all the faults in the display I arrived but did not switch off the car or lock it. The technician took readings directly and sent to Germany and that helped and solved my issues. Once the car was switched off all faults had cleared. So poor sw engineering

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