VarioSpam

Hello everyone. I’ve got another problem, this time seems to be the PDCC/Steering pump. Its certainly beyond my DIY but I have a few questions about sourcing a replacement.

Car

• 958 Turbo, 2011. UK

Symptoms:

• There has always been a niggling minor vibration, which was thought to be the engine mounts
• A few days ago I heard the sound of a small piece of metal falling off the car, soon after followed some nasty vibration and rattling coming from underneath the front of the car. This could be observed after driving a short way, heard whilst driving and in Neutral or Park. Rattling worse when revving the engine to 2k or so.
• Suspected it was transmission related so I had it recovered to local independent garage.
• Air suspension and power steering are working OK, in fact the only symptom is the noise & vibration.

Diagnosis

• A bracket for the PDCC/steering pump has come off, but even after replacing it, the pump is vibrating very strongly.
• Filter and fluid was replaced 1y ago, looks fine.
• Seems the excessive vibration from the pump caused it to become loose, and is due to a fault in the pump.
• I think the pump part is 958 314 022 11. The Porsche part is very expensive new: £1,600 GBP + tax.

Questions

• Has anyone seen this type of fault before or have any view on it?
• Does anyone know if this pump is also used on other brands (VW etc) and thus available cheaper?
• Any views on using a reconditioned unit, I can see one place for example:
  • https://www.abcspecialist.nl/en/arti...p-pdcc?itm=823
  • Also there is Lizart 04.48.0662, https://www.lizarte.com/en/STEERING-...4-48-0662.aspx, not that I can see this in stock anywhere
• The reconditioned items have 500-600 EUR deposit for the old one. I wonder if this means I could simply sell the old one for ~300 even if I purchased a brand new one.

References:

• Video showing what seems to be the same replacement,
  You Tube
  . It seems like the replacement isnt from Porsche but unfortunately doesn't mention where it was sourced from.
• Related part codes:
  • 958 314 022 11
  • Ixetic 05C21 (Ixetic seems to be the OEM, can’t find this code anywhere)
  • LH2115444 (?)
  • 7L5 422 137J (?)
  • LIZARTE 04.48.0662 (remanufacturer) https://www.lizarte.com/en/STEERING-...4-48-0662.aspx

*Thank You!*

VarioSpam

Question: Could this vibration be caused by trapped air in either PDCC or Power Steering hydraulics? I did have the PDCC reservoir replaced 1Y ago, so perhaps possible that if if the fluid change was not done correctly it could have caused air to be trapped in the system? Does anyone have a view on whether this vibration is likely to be air in either circuit vs the pump failing?

I can find some sources of recon'd pumps, I guess these should be OK, and give a significant saving over buying the new part. Seems this pump is also used in Audi Q7 but I can't find a cheaper source for that part code. New part ~2k GBP, recon 0.7-0.9k.

Chris M.

I have one from abcspecialists but haven’t installed it yet. Did you end up replacing yours and if so did that fix your problem?

VarioSpam

Ah, sorry, yes I should have updated the thread. I got one from World Of Regeneration / The Best Zabielski , as listed here. The deposit held in lieu of the old pump was high but they fully refunded it, no problem.
To be clear, wasn't DIY; apparently a fiddly job and hard to get the old one off. The bracket had come off, but was only available as part of a whole set so my garage made one. Replacing the pump did fix the vibration, all seems good. I do notice a loud whirring now, louder than the engine at low rpms. I suppose this is OK as there's no other symptom, not sure the whirring is definitely this pump or not. I thought power steering pumps often made such a noise but only when under demand from turning, not all the time.
I had also asked Lizarte (Spain) who do rebuilds, but they didn't have any old 'cores' to rebuild. Leads me to think the failures may be rare as there don't seem to be many of these kicking around despite being on the Audi Q7 as well.

Chris M.

good to know, thanks for the update

manipou

I have a 2013 Cayenne Turbo and have this exact problem, only 50,000 miles and full history. Have a very annoying vibration/rattle at about 1200-1800 rpm. Very similar vibration when touching/holding the pipes from the hydraulic reservoir so I assume it is the pump as described in this thread.

You mentioned a bracket holding the pipes had come off, Do you know where the bracket was located so I can check to see if mine has come off as well?

Thanks

VarioSpam

Not quite sure, but must have been right by the pump. When this came off it was more than annoying, it was clear something was badly wrong so I had the vehicle recovered. The garage agreed that if it was driven like this then quite likely lead to some really bad damage - maybe a hose pipe could break or the drive belt could come off.

However, seems there are a good few clamps on the pipes which can come loose or break, or don't get put back when other work has been done on the car. I'd suggest take it to an indy garage and have them check all of these mounts. If they're good and it still vibrates then it may be the pump, like mine.

I've been driving mine for a year now on the reconditioned pump. Its had all the mounts checked and fixed as well. There is now no vibration. There is a fairly noisy whine as others have reported, but it seems to be benign since all working fine.

Chris M.

One of the brackets is on the hydraulic lines for the front sway bar. You can see them if you look under the front bumper.

LMK if you need a replacement pump I have one.

manipou

Thanks guys, had a look at my bracket in front of the engine (19), it has indeed failed. The metal bracket has broken and the rubber dampening buffers have also failed. Looking at the bracket design this looks like it is specially there to dampen vibration?

You said replacing this bracket assembly didn't fix the vibration? I guess I'll get this fixed, but perhaps have a failing pump anyway... annoyingly outside the low rev range there is no vibration.

Thanks again and Merry Christmas!

manipou

I changed the rubber dampening buffers and the vibration got worse!! I think I might need a new pump...

manipou

Had significant pulsing vibration on the return pipe at the PDCC reservoir at around 1500-1800rpm. So loud it was annoying in the cabin. New PDCC pump from Porsche and now no vibration.

garrett376

Thanks for sharing the result!