Problem with PDK?
Advanced
Joined: Aug 2019
Posts: 97
Likes: 43
From: Chicago
All, thank you for your input so far.
Maybe I did not explain it properly. The car did not accelerate further and was revving at 5000rpm. I was still pushing max or almost max throttle. It was like the car was hitting a limiter. The car should have either accelerated further and increased rpm until redline, or shift and accelerate. This happened 4 times in a row, in automatic and also in manual mode while shifting using the shifting pedals.
Very weird indeed. Today I was at the mechanic and we could not reproduce the issue. There are also no error codes to be found.
.
Maybe I did not explain it properly. The car did not accelerate further and was revving at 5000rpm. I was still pushing max or almost max throttle. It was like the car was hitting a limiter. The car should have either accelerated further and increased rpm until redline, or shift and accelerate. This happened 4 times in a row, in automatic and also in manual mode while shifting using the shifting pedals.
Very weird indeed. Today I was at the mechanic and we could not reproduce the issue. There are also no error codes to be found.
.
Were you driving it any differently? Or was it the mechanic test driving the car?
Thread Starter
8th Gear
Joined: Apr 2024
Posts: 10
Likes: 0
If what you're saying is that the car, under full Open Throttle acceleration only goes to 5k RPM and hangs there without shifting or going beyond 5k, yes, sounds like an issue. But in may not be the PDK at all, more ECU related. Could also be PSM related. Curiously, you have no codes or fault warnings? Do you notice the yellow PSM light come up on the dash when this happens? If the PDK were having a mechanical issue to not allow it beyond 5k I'm sure there'd be some warning. If the PSM is acting up, perhaps it believes everything is normal and so no warning. My take based on the limited info. Good luck.
Thread Starter
8th Gear
Joined: Apr 2024
Posts: 10
Likes: 0
I now suspect that the issue only occurs under certain conditions. Maybe it has to do with environmental variables (air pressure / humidity) or when certain parts are at a certain temperature. [edit: or something similar to a loose screw..] Best case is that this was a temporary hickup where the computer had to adjust to these conditions / relearn something.
I also called Porsche yesterday and they said without being able to reproducee the issue, it could be a million things. They were not able to point me into a direction.
In the next few weeks I will testdrive thoroughly and hope to have my phone ready for a video in case it happens again.
Last edited by GeneSequence0; Apr 16, 2024 at 04:02 AM.
Instructor
Joined: Mar 2022
Posts: 219
Likes: 113
From: Miami
There were no lights flashing and no error codes whatsoever. However they did find a CV-joint boot leaking grease on the front right, which they are now fixing. Could this support your PSM theory? According to the mechanic this it not connected to the behaviour I described.
1st Gear
Joined: Nov 2024
Posts: 1
Likes: 0
Hey, did you ever get this resolved?
My 2018 GTS has developed a similar issue, in Drive (auto) press accelerator flat to the floor to engage lockdown, car drops a few gears but as it accelerates it bounces off the rev limiter rather than engaging the next gear.
My 2018 GTS has developed a similar issue, in Drive (auto) press accelerator flat to the floor to engage lockdown, car drops a few gears but as it accelerates it bounces off the rev limiter rather than engaging the next gear.
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Intermediate
Joined: Jun 2021
Posts: 42
Likes: 27
From: Adelaide
Have a GT4RS that has the odd event that Drive will not engage when cold. Can have reverse but gear 1 not available. No warning messages. Turning the car off and restarting usually clears. Has done this since new. Dealer says 'normal' in cold and low pressure at clutch plate.
Driving at Phillip island F1 track out of Melbourne Australia, 4th gear corner at 140km/hr brake and manually ask for downshift into 3rd gave me a box full of neutral. Error messages by three. No gears either manually or in auto available. Needless to say I overshot the right hander as no engine braking....Turning car off and restarting gave me gear 1, 3, & 5. Gearbox would skip clutch pack two 2, 4, & 6. So a limp back to pits and a tow to a Porsche Dealership.
Faulty clutch pack 2 solenoid and pressure valve. New PDK coming from Germany. Melbourne has GT3 PDKs but even though gearing the same they are a different gearbox (electronic lockup and reversed installation?). Covered by warranty as only 10 000KMs on clock. 1600kms on track. Frustrating as there were indications of a fault ignored by dealership...
Driving at Phillip island F1 track out of Melbourne Australia, 4th gear corner at 140km/hr brake and manually ask for downshift into 3rd gave me a box full of neutral. Error messages by three. No gears either manually or in auto available. Needless to say I overshot the right hander as no engine braking....Turning car off and restarting gave me gear 1, 3, & 5. Gearbox would skip clutch pack two 2, 4, & 6. So a limp back to pits and a tow to a Porsche Dealership.
Faulty clutch pack 2 solenoid and pressure valve. New PDK coming from Germany. Melbourne has GT3 PDKs but even though gearing the same they are a different gearbox (electronic lockup and reversed installation?). Covered by warranty as only 10 000KMs on clock. 1600kms on track. Frustrating as there were indications of a fault ignored by dealership...
Drifting
Joined: Jul 2019
Posts: 2,008
Likes: 2,067
From: Southern California
Have a GT4RS that has the odd event that Drive will not engage when cold. Can have reverse but gear 1 not available. No warning messages. Turning the car off and restarting usually clears. Has done this since new. Dealer says 'normal' in cold and low pressure at clutch plate.
Driving at Phillip island F1 track out of Melbourne Australia, 4th gear corner at 140km/hr brake and manually ask for downshift into 3rd gave me a box full of neutral. Error messages by three. No gears either manually or in auto available. Needless to say I overshot the right hander as no engine braking....Turning car off and restarting gave me gear 1, 3, & 5. Gearbox would skip clutch pack two 2, 4, & 6. So a limp back to pits and a tow to a Porsche Dealership.
Faulty clutch pack 2 solenoid and pressure valve. New PDK coming from Germany. Melbourne has GT3 PDKs but even though gearing the same they are a different gearbox (electronic lockup and reversed installation?). Covered by warranty as only 10 000KMs on clock. 1600kms on track. Frustrating as there were indications of a fault ignored by dealership...
Driving at Phillip island F1 track out of Melbourne Australia, 4th gear corner at 140km/hr brake and manually ask for downshift into 3rd gave me a box full of neutral. Error messages by three. No gears either manually or in auto available. Needless to say I overshot the right hander as no engine braking....Turning car off and restarting gave me gear 1, 3, & 5. Gearbox would skip clutch pack two 2, 4, & 6. So a limp back to pits and a tow to a Porsche Dealership.
Faulty clutch pack 2 solenoid and pressure valve. New PDK coming from Germany. Melbourne has GT3 PDKs but even though gearing the same they are a different gearbox (electronic lockup and reversed installation?). Covered by warranty as only 10 000KMs on clock. 1600kms on track. Frustrating as there were indications of a fault ignored by dealership...
Folks, if your car is out of warranty please do NOT listen to the Porsche Service Advisor when he tells you that you need a new $20k PDK for something like this. They have no idea what they are talking about when it comes to the PDK as Porsche keeps them in the dark. Plus they get commission on that $20k PDK so there's zero incentive to learn. A $50 part, an hour labor, replace the drained fluid, and a PDK calibration, and this car is almost certainly back on the road.
For more info see my thread on PDK repair and scroll down to the valve body section.
https://rennlist.com/forums/997-foru...nsmission.html
Last edited by PV997; Dec 4, 2024 at 01:16 PM.
