Hi I have a 2016 991.2 C4S with 48k miles and excellent service history. There is an audible 'chatter' coming from the PDK which can only be heard from inside the car and only when idling. It is not really loud but i can hear it. I took the car to a specialist Porsche garage and they carried out a re-set with the plug in computer and this has made a slight improvement but i can still hear a faint mechanical noise (sounds like a exhaust heat shield but it is not). Does anyone have any ideas and is this normal? Thanks in advance for the advice!
PDK Gearbox 'chatter'
- Thread starter neil.brown1
- Start date
Greenman986S
PCGB Member
When was the box last serviced?
Hi Neil,
The 991 PDK transmission has a dual mass flywheel and if it fails or is failing it’s possible that this could lead to the issue you describe. Unfortunately it would need the transmission to be removed to check, and of course the cause could be elsewhere which would mean a complete - and very expensive - replacement transmission because Porsche don’t regard it as a serviceable item.
Probably best just to learn to live with it unless it becomes a lot worse or affects the functioning of the transmission.
Jeff
The 991 PDK transmission has a dual mass flywheel and if it fails or is failing it’s possible that this could lead to the issue you describe. Unfortunately it would need the transmission to be removed to check, and of course the cause could be elsewhere which would mean a complete - and very expensive - replacement transmission because Porsche don’t regard it as a serviceable item.
Probably best just to learn to live with it unless it becomes a lot worse or affects the functioning of the transmission.
Jeff
Hi, the box has never had a service but this was my intended next step. Thanks.
Hi Jeff thanks for your response. That's a concern obviously. The car changes gear well and is functioning perfectly so i was hoping that this maybe down to requiring a re-set and a through oil and filter service. I have wondered if this is just a characteristic of the PDK box. Thanks Neil.Hi Neil,
The 991 PDK transmission has a dual mass flywheel and if it fails or is failing it’s possible that this could lead to the issue you describe. Unfortunately it would need the transmission to be removed to check, and of course the cause could be elsewhere which would mean a complete - and very expensive - replacement transmission because Porsche don’t regard it as a serviceable item.
Probably best just to learn to live with it unless it becomes a lot worse or affects the functioning of the transmission.
Jeff
Neil I think the official PDK service period for your car is 12-years/120,000 miles, so I’d agree that it’ll be worth having an oil and filter service carried out if it’s never been done, especially since the reset by your Porsche Independent has given only a marginal improvement, so your options are very limited.
Good luck!
Jeff
Good luck!
Jeff
Are there any Porsche Technicians on this group who could shed any light on what can be considered 'normal' operating sounds with the PDK box?
Thanks for your response, yes the specialist garage is telling me the same. It is just worrying especially if you plan to do any long road trips, which i do have planned in the near futrure (Germany/Swiss Alps etc).
Neil, even if you’re not a Club member I think your best bet would be to get along to one of the Club’s regional monthly meetings in your area. The PDK transmission is a very common option with the modern water-cooled cars and I’m sure that there will be at least a couple of owners who would let you see if those cars display the same issue as yours.
Information about the Club’s Regions, including the Regional Organiser’s contact details, can be found here:
www.porscheclubgb.com
Jeff
Information about the Club’s Regions, including the Regional Organiser’s contact details, can be found here:
Porsche Club regions | Regions & Registers | Porsche Club Great Britain
Porsche Club GB is organised into over 30 regions covering the whole of the UK. Porsche Club GB - A passion shared.
Jeff
Hi Jeff, thanks that's a good point actually. As i am a member and do frequent these local events, i will ask around.
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