CanyonBlaster

You must be retired, lotsa time on your hands?
A 3-4/4-3 shift issue has ZERO to do with boost.....

Original Post Topic = "Jerky Shifting into 3rd and 4th Gear in my 2012 Cayenne S"

deilenberger

Nice attitude.

I didn't say boost had anything to do with the rough shifting. But boost can be retarded apparently by a slipping transfer-case clutch that results in rough shifts. The rough shift triggers the retarding of boost.

My point was - my boost was never very impressive. Now that the transfer case is working smoothly - it is. And for someone having rough shifts - before assuming it's the transmission - there is a lot more to a driveline than just the transmission (which appear to be trouble free on the 958 series.)

Have a nice day.

fivefathomapple

I just purchased a 2012 CS that is under CPO for another month. I felt the jerky shifting, called the local dealership, explained the issue over the phone and the SM was quick to say the problem is the TC. After I left the car for several days, they called me to say they couldn't find any issues. I clearly have the TC problem, but the dealership doesn't want to seem to help. They said, if there is a problem, it will have to get worse before they fix it... What should I do?

deilenberger

Any other dealers in the area?

And get your complaint and their response documented fully, in writing (or print).. so when it does go really bad you have something to wave at Porsche Cars North America (assuming you're in NA..)

ChenChen Lin

Don't wait. This was exactly what my dealer said and now my warranty is over and the problem gotten worse. And Porsche north america can give less of a f#ck about me and my problem.

CanyonBlaster

I should have posted follow up months ago. Dealer replaced my TC under warranty and it made a big improvement on my 3-4 and 4-3 shifts. They still are not as smooth as all other shifts but now barely perceptible.

GTorTT

My 2013 Cayenne GTS is having the same problem (80k miles). I'm going to take it in and first have the transfer case fluid changed. I'll report back if that is a fix.

GTorTT

Well, the fix for my 2013 Cayenne GTS was a new transfer case. Unfortunately, I was out of warranty. It seems to have fixed the issue, but was about $5,700. I previously made a conscious decision not to buy the extended warranty and to self-insure. Perhaps the warranty would have been a better way to go. Time will tell.

GTorTT

Should have added that the Service Advisor said they have seen the transfer case issue quite a bit. The fact that they had a new transfer case in stock may say something...

deilenberger

Did you try the fluid change before the TC replacement?

GTorTT

I did talk with the Service Advisor about fluid change as a possible fix when I dropped it off. They called after driving the car and said it was the TC, and when I again asked if a fluid change would fix it, I was told that it would not. Wondering if I should have pushed for the fluid change. Have a number of these cases been rectified by a fluid change?

deilenberger

Only about 90% have either been cured or shown improvement with a fluid change. And it's very easy and cheap to do. Go look at our Cayenne DIY forum. Print out the DIY. Take the car to a good independent with the Pensotin oil spec'd in the DIY - and have him change it. Easy.

Think about the dealerships motivation. Hmmm.... $50/fluid, 1/2 hour work max VS new transfer case & install - $5k? When you talk to a "Service Advisor" remember that their job is to sell service. They undoubtedly are rated by the $$ amount of service that they sell every month.

And if it doesn't work - hey - you tried (and can use that story with SWMBO when she complains about the expense on that damn car again..) Sorry to see you asked after spending the $5,400 - but perhaps it will serve as a lesson to others. (Someone once said "My role in life is to be a bad example for others.." - I sometimes feel this way..)

TheCayenneKid

+1 for this, Hopefully you have not already been in for the new case GT. I had a local dealer tell me the exact same thing, I think they figured I was some know-nothing newbie. At first the Tech claimed that there was no fluid in the transfer case, and that the only solution was to change the whole unit at about ~$5k. (Note, this was him denying that there ever was fluid in any transfer case... you can imagine my surprise to his epic display of ignorance). I got a local Porsche Specialist shop to swap the fluid for $120 and that was about a month ago, car runs smooth as silk ever since, I think I was lucky I got a fix soon after the symptoms started showing up. I was so impressed by the difference of the TC fluid change, I am brining it in next week to have them change all fluids; Oil (naturally), Transmission, and Differentials (I'm approaching 65k miles). Just had the brake lines bled last winter prior to me taking ownership. I figure a few hundred in labor and fluids could save me thousands in parts. Porsche has a tendency to claim certain fluids are 'lifetime fluids' but I'm inclined to disagree, especially for the Transfer Case. I plan on changing the TC fluid every other oil change to keep the problem away.

Hope this helps.

quickster2

I think you will need to sit down once you hear the transmission fluid and filter costs. I will, as others will, be interested to see if the SA advocates this. I was talked out of a tranny fluid change by 2 dealers on my now 80K 2102 S. Still don't know which way to proceed. I do plan on keeping my PiG well into its golden years. All other fluids have been changed proactively.

TheCayenneKid

I hear ya, I know it's gonna be a doozy. 'A few hundred in labor and fluids' is quite the understatement. I have a private moonlight shop that specializes in Porsche Service near me so it's considerably less than a stealership, but I'm prepared for the worst and hoping for the best as they say. I don't have any jerky shifts at the moment (These Pigs were never the smoothest shifting things on the road), but I figure that if it's suggested at a certain point, I don't want to wait until its clunkin' and jerkin' before I do it. As previously stated, I've been amazed how much a fluid swap can change a car. Previous manual cars of mine were night and day differences after swapping the Tranny fluid; shifts like butter. I'm petrified of anything breaking on this car ($$$) so I figure an ounce of prevention could go a long way. Similar to you, I plan on keeping this car for a long time. I'll try and rely what he says.

Cheers