Lurching
There is a very interesting Rennlist thread on the hesitation some Cayenne owners experience with their cars (web page). This has been noted and written about in many places and is likely the most common and universal complaint of owners. The problem manifests itself only in automatic mode. There is sometimes a significant lag between the time when the accelerator is pressed and when the car accelerates. This often happens at the most inopportune times, such as when you are driving slowly, trying to merge with traffic. You see an opening, pull into traffic and hit the throttle. The car pauses while you watch the traffic approach. 
Eventually the car takes off with a roar.
The problem does not occur in Tiptronic manual mode or when PSM is switched off. I originally thought it was only a transmission downshifting issue but, while that is part of the problem, it also involves the drive-by-wire throttle.
It is rumored that Porsche now has a fix for the problem. Many owners are taking their vehicles in and getting a software update that solves the issue. Other owners (myself for instance) are being told by the dealer that Porsche has not yet made a fix available. Which leaves us in a bit of a lurch.
Eventually the car takes off with a roar.The problem does not occur in Tiptronic manual mode or when PSM is switched off. I originally thought it was only a transmission downshifting issue but, while that is part of the problem, it also involves the drive-by-wire throttle.
It is rumored that Porsche now has a fix for the problem. Many owners are taking their vehicles in and getting a software update that solves the issue. Other owners (myself for instance) are being told by the dealer that Porsche has not yet made a fix available. Which leaves us in a bit of a lurch.
