Greenwich07

Wanted to add my statistic to the Transfer Case failure list. My 2013 CS was coming to the end of the Porsche Warranty period after 3 years and approx 30k miles. Thought a check up would be prudent and mentioned to dealer that a slight thumping sound from car in 2nd gear, thought at first it was uneven road but happened too often on different surfaces.

Pleased I asked them to check because turned out TC was failing and was replaced under warranty (day before it expired)

Dealer noticed my front tires were more worn than rear but didn't mention this might be a factor in TC failure, just tried to sell me two new ones.

deilenberger

Thanks! If you're a member at RennTech - please do go add the info to: https://www.renntech.org/forums/topi...er-case-fluid/

We're trying to keep track of failed TC's.

You might also consider posting the info on: https://www.6speedonline.com/forums/...-replaced.html - another repository for failed transfer-cases.

bweSteve

Done (reported on RennTech).
=Steve

North Shore 911

Cross posting this from 6Speed .... Adding my TC failure and Dealer replacement (with the new vent line) on my 2012 Cayenne S to this building data base. Mine was covered under CPO in January 2017. I posted up a thread on my symptoms and my eventual resolution at: https://rennlist.com/forums/porsche-...yenne-s-2.html

I had ~53k on the clock and I posted up a pic of the paperwork on the "Post your Repair/Warranty List Here" sticky on RL. Is there an additional site to catalogue these failures (I'm not a member on RennTech)? I just want to make sure that my stat gets added to this astonishingly long list of failures ...

r553

Is it known what MY the new design vent system was installed?

deilenberger

No. I suspect it probably only went into production with perhaps the 2017 models. No way to really tell since the vent can't be seen or felt from under the car, and I don't know what I'd be looking for in the engine compartment.

CarGuyNVA

I've mentioned this already in another thread somewhere here in Rennlist, but my '11 CTT had it's first TC replaced at around 31k miles when still owned by the original owner. Then I just had it replaced again at 60k miles.

Mine's had the two service campaigns associated with the AWD and E-diff reprogramming completed. I'll see when I pick it up later this week if the new transfer case they've installed got the new vent kit as well this time. I'm told that the new transfer case is an updated/revised version. When I get it back I'll compare the part # on this invoice to the previous one done at 31k miles to see if that's different.

And BTW, my vehicle is far from abused or being driven overly aggressive in case anyone is wondering if that may have been a contributing factor. It's not.

CarGuyNVA

I mentioned I'd report back when I got my CTT back from service regarding the 2nd transfer case replacement.

As mentioned before, the 1st replacement was at around 31k miles when in possession of the first/original owner. It has now been replaced a 2nd time at 61k. Covered by warranty in both instances.

So comparing the two service tickets, the part #s seem to confirm what the SA told me regarding updated hardware. The part #s for the transfer case is different from what it was when replaced the first time (June 2013). There's also a number of other misc. parts listed this time that were not on the 2013 invoice, including the new transfer case vent kit.

The first transfer case was part # 958-341-010-FX. This new one is 958-341-011-EX. The tech noted on the invoice "Recommend: transfer case and update parts". The other parts listed are as follows:

1 N-103-284-01 Line Bracket
1 958-301-047-10 Vent Line Transfer
1 N-107-873-01 Spacer Ring
1 02H-409-275-A Sleeve
1 958-341-375-01 Protective Ring Tran
1 WHT-005-158 O-Ring
1 958-349-491-10 Circlip Transfer Box

With the first replacement in 2013, the only other part listed on the invoice in addition to the transfer case itself was ten WHT-003-211 12-point screws 10x50.

Hope this info might help others. Vehicle is running great now, SMOOTH on accel.

deilenberger

CarGuyNVA - thanks - added to the list I'm keeping over on RennTech.. https://www.renntech.org/forums/topi...comment-287227

CarGuyNVA

Perfect, thank you.

g8tor20

May be a stupid question, but out of curiosity, does the transfer case issue occur with the CTTS? Or how about those with ptv?

ive read a few threads and had not seen a CTTS mentioned but that could just be that there are far fewer of them. Also wasn't sure if the folks who get ptv tourqe vectoring are also affected or if it's that's two completely different mechanical parts

deilenberger

I have seen mention of a failed XFerCase on a CTTS with torque-vectoring. So - yeah, it happens.

bweSteve

g8tor20, ... even though mine is not a CTTS, it is a CTT with PTV (& PDCC). My TC started failing at 43k miles. No idea if PTV has any impact on or with, but I did mention that thought in one of my prior posts too. I doubt the CTTS TC is immune.

CarGuyNVA

Mine has the PU5 Sport Pkg which includes PTV+. And as you can see from the posts above, mine has had two replacements, the most recent containing updated hardware. So I'm hoping that's it and it's solved once and for all this time around. Time will tell.

I believe the only 958 that may be 'immune' is the diesel model? I think it uses a different transfer case.

chsu74

I don't think diesels are immune from the transfer case issue. The departure from a low range option transfer case in the 958 model leas to a redesign of the TC.

Hindsight shows that the design needs work. Mercedes also have this problem with the GL(X164)/ML(W164) models as well.