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This may be a dumb question (I don't know much about cars). Any chance getting the engine tuned would help?
Unfortunately, no. The problem seems to be with the transmission hardware and/or software. This issue has been ongoing since the first 2019s hit the road. Your best bet may be to reach out to 1-800-Porsche and start a case. However, others have done that (me included) to no avail. The good news, at least in my case, was that the lunging became less pronounced as time wore on. By the time I got rid of the car 3 years later with 28.5k miles on the odo, the lunging was significantly less pronounced than when I first got the car.
It just seems impossible that this can't be corrected through coding. This transmission is in many vehicles, it only acts like this in one of them. The transmissions are the same, but the coding is different. The problem is in the coding.
Would tuning the transmission improve this? However, I called a tuning place today and they said Porsche would 100% be able to see the modifications and it would void the warranty.
I think this has to do with a combination of insufficient damping, too little stiffness and too much lash in the driveline.
I was in cross town stop-go traffic for a while today and was noticing closed throttle (coasting) downshifts from 3-2 and 2-1. There is an oscillation which thrusts the car forward a half second after the initial deceleration resulting from higher engine rpm. Hard to explain but you know it when you feel it.
Damping comes primarily from engine mounts.
Stiffness comes from engine mounts, plus shaft and joint stiffnesses in propshafts and halfshafts.
WKK2 and WNH1 campaigns are unrelated and have no effect.
I think this has to do with a combination of insufficient damping, too little stiffness and too much lash in the driveline.
I was in cross town stop-go traffic for a while today and was noticing closed throttle (coasting) downshifts from 3-2 and 2-1. There is an oscillation which thrusts the car forward a half second after the initial deceleration resulting from higher engine rpm. Hard to explain but you know it when you feel it.
Damping comes primarily from engine mounts.
Stiffness comes from engine mounts, plus shaft and joint stiffnesses in propshafts and halfshafts.
WKK2 and WNH1 campaigns are unrelated and have no effect.
Yet, for those that the dealer could not fix their 2->1 lurching issue, there is a simple workaround which shows it's some kind of software/similar issue.
If when braking, you press the shift paddle to down shift or upshift, the braking goes as smooth as butter with zero lurching. There is no lurching issue at all.
My dealer said "all is normal" when I took my car in. I did find shifting up/down while nearing a stop has eliminated this though and the car stays in 2nd gear. I'm OK with this "solution" but this is my first Porsche that I'm confused about the driving dynamics. Othewise it's a great car, adding a tune to it next week as well (Cobb).
Yet, for those that the dealer could not fix their 2->1 lurching issue, there is a simple workaround which shows it's some kind of software/similar issue.
If when braking, you press the shift paddle to down shift or upshift, the braking goes as smooth as butter with zero lurching. There is no lurching issue at all.
This does not work in a hybrid. Because then it starts the engine.
Good day,
May I ask you at which Porsche dealership you had your RDK control re-programed?
I have the same problem with my (new) CPO 2019 Cayenne since I bought it last week.
Local dealership in Canada may ask me where does that information comes from.
Best regards.
Originally Posted by PorscheACC
I just had my 20,000 mile service, and they did an RDK update, and there is no more transmission lurching when braking..
Now it is smooth braking/downshifting in Sports mode.
I had that issue since day one and for 22,000 miles, so I was very familiar with it.
Good day,
May I ask you at which Porsche dealership you had your RDK control re-programed?
I have the same problem with my (new) CPO 2019 Cayenne since I bought it last week.
Local dealership in Canada may ask me where does that information comes from.
Best regards.
With other forum members, we tried contacting my Porsche of Houston North dealer, but there was no specific description of the fix in their records.
Later, I learn that Porsche does not describe many warranty fixes to some issues that can affect the reliability ratings of Porsche models, so the fix information was lost.. I had other fixes to other issues where the fix never got recorded into their service records, so I know Porsche does this..
I suffered with that severe issue for 20,000 miles, and I have now 102,000 miles and my Cayenne downshifts smooth as butter in sports mode, any gear, and while braking too..
I wish Porsche will find an official fix to this issue for all owners, since it is a very annoying, and sometimes dangerous issue, since you lose a couple of feet distance while braking, while in sports mode, and while automatically downshifting to lower gear and in a lurching manner.
Good day,
May I ask you at which Porsche dealership you had your RDK control re-programed?
I have the same problem with my (new) CPO 2019 Cayenne since I bought it last week.
Local dealership in Canada may ask me where does that information comes from.
Best regards.
Have you checked to see if there are any outstanding recalls for your VIN? The following website redirects to a webpage for the U.S. since that is where I'm at. Maybe it will redirect for Canada: https://recall.porsche.com/
08-14-2022, 12:20 AM
