History: I bought my CTT with 133k about 1.5 years ago. When I bought it, it had a very jerky 3-4 shift and 4-3 downshift, where it would jerk the car very noticeably and the RPMs would go up and down too, as if it was quickly shifting between the two gears before finally deciding to shift gears. When shifting the car manually, there was no issues and it shifted smoothly. I immediately did a transfer case fluid flush (I used Febi 170367, which all my research says it's the same as OEM), and it didn't do anything, although the fluid was very dirty. So then I did a transmission flush with new filter and used 7L of FUCHS ATF. (Although it says on Carfax they did a trans flush with filter and a rear diff flush at 100K) This still didn't make any difference, although of course it did drive smoother after both flushes, but didn't fix the jerky shifts. Then I did a transmission adapdation reset with a good scanner and it fixed the shifts. They were perfectly smooth.

About 8 months later, the jerky 3-4 shift returned, although not as bad as initially, and the 4-3 shift was fine. I did another transmission adaptation reset and it fixed it again for about 3 months. Then it came back, I did another reset and then it lasted about a month before it came back. Then I did another reset, it lasted about a week before it came back. Then I did another reset, and it lasted only about one day. I did it a few more times to make sure, and it only lasted a day. I saw that Porsche extended the transfer case warranty to 10 years, but unfortunately by now mine is just a little bit over 10 years old. So I decided to just live with it, since I could just manually shift it, or drive it hard and make sure to shift 3-4 over 2300RPM, and I almost never have anyone in the car with me anyway. (Mind you, this whole time, even when my shifts were smooth, the transfer case often shudders badly when making slow left turns, but not every single time. It's impossible to constantly reproduce it. Even a full lock left turn, sometimes it won't shudder.)

Last night, it just started shifting very hard and rough from 3-4. Like much rougher than a shift kit in an old school muscle car. No jerkiness, no slipping, just a hard rough shift. It did it when the car was cold too, which the jerky 3-4 shift almost never does. It occurs while manually shifting now too. I also tried to shift manually at 2500RPM and 3000RPM and it still had an equally rough shift. Didn't try any higher RPMs since I didn't have a safe chance to drive it that hard due to traffic. If I shift at super low RPMs like under 1500RPM, it shifts very smoothly.

The car has 138k now, so I didn't drive it much. Sorry don't have any further mileage info, like when the 3-4 jerky shift first came back.

Any ideas or suggestions? I'm in the Bay Area, CA, if anyone knows any shops that can properly diagnose it.

 

Did you Ever solve this issue?

 

No I did not, but the constant hard shifting stopped after that night. It’s back to just being jerky when automatically shifting around 1800-2200 rpm. I can still avoid it by driving it harder (making it shift at higher rpm) or softer (making it shift at less rpm), or by simply shifting in manual mode. Since it’s a personal car and I almost never have any passengers, I’m just living with it for now. Tired of bringing it to shops. The skipping while turning at low speeds hasn’t seemed to get any better or worse.

 

My 2013 958.1 CTT is annoying the hell out of me at maintenance throttle 3-4 and I read somewhere that a guy put a 958.2 gearbox on a 958.1 and that solved all issues.

Would anyone here know anything about this?

 

Did you try transfer case flush and transmission adaptation with a scanner? A lot of people have reported good results with just a transfer case flush.

 

Yes i have changed all fluids more than once, including transfer case. This week trying replace throttle body and make transmission Adaption reset...

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I have the EXACT same problem as you. I flushed the transmission 2 times, replaced the TC oil few times and also replaced the Valve Body, which, did NOT solve this issue. I am stuck with this 3-4 hard shift, but as I am accelerating other than with maintenance throttle, lets say about 20% and more Throttle, it shifts perfect.
@Reltimestories: 958.1 and 958.2 have identical Aisin gearboxes.

 

That's really sad man, there must be a fix for this, especially if it seems to occur all over the place!

 

Indeed. I doubt it is a TC problem as I change the TC oil every second oil change. I also tried disconnecting the TC servo, front drive shaft... The problem with the gearbox always stays the same. I think Porsche could solve it with some Software update, as the gearbox shifts perfect under load.

 

I had the same issue, dealership replaced the transfer case under CPO warranty and it's now fine.

 

Apologies if this is in the wrong place. I have just purchased a 958.2 3.0TDI with dieselgate software in the dme and tcu. In particular the shifting is poor with rapid up shifts lazy down shifts, hunting between 7 and 8 gears and holding low gears when cold. I would like to revert the sw to the pre diesgate software 3457 does anyone know where I can obtain a copy of the .pdx

thanks

 

You will not find a lot of diesel drivers here. This question will be best suited for the Touareg forums…

 

I think you will find that you are very mistaken. There are certainly quite a few 958.1 diesel owners here. I don't know about 958.2...

 

Try a Tunezilla Stage 1, with a Dynamic EGR and a TCU Tune (you'll need to buy the tune). Then, after you install the tune, look up how to do a transmission reset and try that.