Zkalra

So when coming up to a crawling stop from second to first gear in auto and normal driving mode my 992 C2S' PDK makes a distinct clunking sound that can also be felt, albeit mildly. All upshifts are buttery smooth and apart from at low speeds there is no clanking/clunking on any gear. Is this normal? I also read that some throttle body reset procedure resets this and it goes away?!? Is that true? Any software update can possibly help?

Staff@WORLD

If a car comes into our shop with that type of complaint-

First step is to do a PDK adaption with the factory tool. If it passes the adaption then the transmission is considered to be working properly. If luck is on our side we will test drive the car again and the problem would be gone.

If the adaption failed then we would look at the PDK. We would start with a fluid change and would check the fluid that came out to see if it contain any metallic debris. We would also smell some fluid to make sure it does not smell burnt.

These are the basics to start this diagnosis.

Narrowing it down from there will make figuring out out much easier.

Zkalra

Thanks for the detailed info. Will share this with my local workshop. But in general is this a 'normal' sound/feature?

540gone

My 992 (Feb 2020 build) does not have this issue, but my wife's 2018 Panamera (which also has the 8-speed PDK) had the identical issue you describe when it was new. After a few months of driving, I called my SA & he told me there was a software update available - took it in for that update and much improved ever since. You might want to check.

Bluehighways

Just a thought . . . I wonder if what you are feeling/hearing is the engine shutting off. On a deceleration coast (not touching the gas pedal, engine at operating temperature, more than a few minutes since last started by you) the engine control system is designed to shut the engine off and put the PDK gearbox in neutral as you coast down past 8 mph. Part of the Auto Start Stop programming. If you pass this 8 mph line and you so much as touch the gas pedal the whole process reverses. The engine restarts and the transmission engages first gear. Some combination of these scenarios might well be felt as you are describing. You may want to try disabling this "feature" and see if what you are experiencing goes away. According to Porsche (see attached): "The Auto Start Stop function is not available in the following situations: – SPORT/SPORT PLUS driving programmes active." Maybe try running in the Sport or Sport Plus Mode and see if the problem goes away?

lucycan

Is this your first DCT in a vehicle?

ipse dixit

Have you driven other 992 with PDK?

Do they exhibit the same behavior, or no?

I ask because based on your description it may be something entirely normal -- since "clunking sound" could be almost anything or nothing, especially if it's "mild" (Also, as an aside, how do you feel a clunking sound, especially one that is mild?)

Zkalra

thanks. Will send it in on Monday. I also think this could be the issue potentially.

the first thing I do is turn off auto start stop as soon as I start the car.

Fifth. Apart from my 991.1 no other car with a DCT has exhibited this.

yes several. I also feel it could be a feature or ‘virtue’ of the DCT.