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      05-29-2017, 01:51 PM   #1
kanvas
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Transmission tugging and twitching

I've noticed something odd lately.

When going from 1st to 2nd gear, and 2nd to 3rd gear, (pedal 1/3 to halfway pressed) right at the point of gear change, the car does this slight backwards "tug," as if something is slightly tugging/pulling the car from behind before going onto the next gear. I don't notice this in higher gear level changes, however. I'm in Comfort mode, not using paddle shifters.

Also, when almost fully accelerating (near full throttle), the car twitches about 5-6 times when it's on 2nd gear and approaches 2k rpm.


Anyone else experience this?
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      05-29-2017, 04:02 PM   #2
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Nope, definitely not the case on mine.
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      05-29-2017, 05:31 PM   #3
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Yes!!!! It is what i have. It started out of nowhere about 2 months ago. Almost to the point that i can replicate it. For instance, when i start to move, and a car in front of me slower than me, i let the gas off, then press again.... I keep on postponing a trip to a dealer. Is there any transmission reset procedure?
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      05-29-2017, 07:45 PM   #4
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Quote:
Originally Posted by artem123 View Post
Yes!!!! It is what i have. It started out of nowhere about 2 months ago. Almost to the point that i can replicate it. For instance, when i start to move, and a car in front of me slower than me, i let the gas off, then press again.... I keep on postponing a trip to a dealer. Is there any transmission reset procedure?
that is because ur gearbox is about to upshift, and with u taping on the gas again, it doesnt know weather to accelerate in the current gear, or upshift to the next gear and accelerate, causing a slight hesitation. if u accelerate smoothly on an open road and just let the car keep on upshifting, does it happen/hesitate?
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      05-29-2017, 07:49 PM   #5
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Quote:
Originally Posted by TOPEC View Post
that is because ur gearbox is about to upshift, and with u taping on the gas again, it doesnt know weather to accelerate in the current gear, or upshift to the next gear and accelerate, causing a slight hesitation. if u accelerate smoothly on an open road and just let the car keep on upshifting, does it happen/hesitate?
No, it does not, but i am talking about rather pronounced jerking. Just like OP described.
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      05-31-2017, 03:44 AM   #6
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Quote:
Originally Posted by artem123 View Post
No, it does not, but i am talking about rather pronounced jerking. Just like OP described.
If I understand correctly, are you describing when you let the foot of the gas? The car does slow down on its on, almost as if breaking. But yes, if you press down the gas with just enough force where the computer is figuring out whether to upshift or not, you could feel the 'jerky" movement.

For my case, it happens when I am accelerating, whether slow acceleration or hard acceleration. The other day, I had the foot all the way down on the pedal and did some quick, twitchy but much more pronounced shaking. If no one has experienced this so far, I might havr to shoot an email to my SA.

These days, Comfort mode is feeling closer to ECO PRO mode, almost half ECO PRO mode..? I might be just imagining things now, but the car feels a tad sluggish.
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      09-27-2017, 08:20 PM   #7
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Quote:
Originally Posted by kanvas View Post
I've noticed something odd lately.

When going from 1st to 2nd gear, and 2nd to 3rd gear, (pedal 1/3 to halfway pressed) right at the point of gear change, the car does this slight backwards "tug," as if something is slightly tugging/pulling the car from behind before going onto the next gear. I don't notice this in higher gear level changes, however. I'm in Comfort mode, not using paddle shifters.

Also, when almost fully accelerating (near full throttle), the car twitches about 5-6 times when it's on 2nd gear and approaches 2k rpm.


Anyone else experience this?

Sounds like we're having the same issue but I phrased it differently.
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      09-28-2017, 05:08 PM   #8
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Strange...currently having this issue on our Cayenne S. I understand a different car completely but coincidence to stumble on this thread.

Let us know what it may be if you ever get a diagnosis.
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      09-28-2017, 06:07 PM   #9
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Just to rule out - it can't be a plug/coil misfire, because it would throw a code correct?

Also, does that same effect exist in EcoPro mode and Sport/Sport+ with and without DTC turned off? AFAIK DTC affects transmission torque limiters and shifts may become jittery

Last edited by DuSh; 09-28-2017 at 07:50 PM..
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      10-06-2017, 09:24 AM   #10
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Took my vehicle to the dealership and got the mechanic to go out with me. I was able to replicate the issue plus I had mentioned this a few visits ago and at that time they didn't find anything. This time however, it was different.

Bottom line, they gave me a loaner (330i) and will let me know what is wrong but they suspect something in the transfer case.

When I know for sure and what the fix is(was), I'll post back.
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      10-06-2017, 11:10 AM   #11
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Got a call from my dealer this morning, they ordered a new transfer case assembly today. They performed a test where they unplugged the transfer car via an electronic cable and it performed normally, plugged it back in, and it reverted back to tugging. They took the case apart and found metal shavings inside the case plus the fluid was totally contaminated because of the shavings. I'm going to find out the specifics when I pick it up next week and I'll post the findings.
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      10-07-2017, 12:03 AM   #12
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Quote:
Originally Posted by buckeyewalt View Post
Got a call from my dealer this morning, they ordered a new transfer case assembly today. They performed a test where they unplugged the transfer car via an electronic cable and it performed normally, plugged it back in, and it reverted back to tugging. They took the case apart and found metal shavings inside the case plus the fluid was totally contaminated because of the shavings. I'm going to find out the specifics when I pick it up next week and I'll post the findings.
Good to know you are getting close to figuring this issue. I'm wondering if we can pull a fuse or something to disconnect transfer case actuator and essentially make it a RWD (I know front axle will still roll and turn, but it won't be under direct load) - just to check if tugging will go away or not (for those affected)?
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      10-07-2017, 10:23 PM   #13
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Quote:
Originally Posted by buckeyewalt View Post
Got a call from my dealer this morning, they ordered a new transfer case assembly today. They performed a test where they unplugged the transfer car via an electronic cable and it performed normally, plugged it back in, and it reverted back to tugging. They took the case apart and found metal shavings inside the case plus the fluid was totally contaminated because of the shavings. I'm going to find out the specifics when I pick it up next week and I'll post the findings.
wow. any word on what could have caused it to fail?
how many miles you have?
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      10-08-2017, 10:49 AM   #14
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I'm going to pick=up the car on Tuesday (hopefully) and I'll post back.

1. I don't know if there is a separate fuse for it or not, or if it's tied in with something else.

2. I have about 39,000 miles on it. Never driver it hard (wife's main vehicle) mostly around town and on vacation.

I've had this issue almost since new but they couldn't replicate the problem so they never fixed anything.
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      10-08-2017, 01:49 PM   #15
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Quote:
Originally Posted by buckeyewalt View Post
I'm going to pick=up the car on Tuesday (hopefully) and I'll post back.

1. I don't know if there is a separate fuse for it or not, or if it's tied in with something else.

2. I have about 39,000 miles on it. Never driver it hard (wife's main vehicle) mostly around town and on vacation.

I've had this issue almost since new but they couldn't replicate the problem so they never fixed anything.
I realize you aren't the OP of this Thread, but did also get a shudder at times, sometimes feels like it is briefly going to stall when you briefly/slightly let off the accelerator? I think I'm experiencing something similar, but I cannot duplicate it--happens out of the blue. This is my wife's car too, so I don't drive it everyday.
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      10-08-2017, 02:01 PM   #16
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Quote:
Originally Posted by Kief View Post
I realize you aren't the OP of this Thread, but did also get a shudder at times, sometimes feels like it is briefly going to stall when you briefly/slightly let off the accelerator? I think I'm experiencing something similar, but I cannot duplicate it--happens out of the blue. This is my wife's car too, so I don't drive it everyday.
Does it happen during hard acceleration too or not? Mine only happens during hard acceleration
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      10-08-2017, 10:45 PM   #17
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Quote:
Originally Posted by Kief View Post
I realize you aren't the OP of this Thread, but did also get a shudder at times, sometimes feels like it is briefly going to stall when you briefly/slightly let off the accelerator? I think I'm experiencing something similar, but I cannot duplicate it--happens out of the blue. This is my wife's car too, so I don't drive it everyday.
I've had 2 issues, this latest one with the transfer case and the one you are describing. I had a post or two on here about this before. Anyway, after several times taking it to a dealer, they finally felt the same thing that I did. The service guy told me that there is a bulletin on this issue. What happens say I'm driving at a steady pace and lift off the gas or have the peddle depressed slightly (off throttle) the car will begin to shudder until you give it a little more gas then it will quit until you do the same thing again. What they did was to totally re-flash the ECU. As a side bar it "feels" peppier, but maybe that's because of the re-flash.
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      10-08-2017, 10:48 PM   #18
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Quote:
Originally Posted by DuSh View Post
Does it happen during hard acceleration too or not? Mine only happens during hard acceleration
Not hard acceleration but a pulling acceleration. If I floor it or close to that, it won't happen. If I'm going 35-40 and want to accelerate if it kicks down a gear and just pulls it will do it however if it kicks into lower gears it won't.
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      10-09-2017, 10:53 AM   #19
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Quote:
Originally Posted by buckeyewalt View Post
The service guy told me that there is a bulletin on this issue.
A TSB on the transfer case or ECU re-flash? Thanks
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      10-09-2017, 11:12 AM   #20
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Quote:
Originally Posted by Kief View Post
A TSB on the transfer case or ECU re-flash? Thanks
I normally save my repair order because it has the TSB or service bulletin written on it, however, this time I guess I didn't because I can't find it. Anyway, the TSB/service bulletin was for the shudder not the transfer case issue.


I posted this about a month ago:
I had an issue that was similar but the cure was obvious. When in part throttle the car would shudder quit a bit. This went on for over a few years until I got a call from my dealer and said that there is a fix for this. It was a reprogramming of the ECU. Bottom line is that no longer do I have the shudder but my response to throttle has been changed dramatically. This is not a placebo effect or anything like that, it was changed. Don't know if you vehicle has this shudder or not mine was a 2014 50i so maybe later ones did not have the issues that I did.

Last edited by buckeyewalt; 10-09-2017 at 11:18 AM..
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      10-09-2017, 11:23 AM   #21
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Found my old post:

I had a post on here about my vehicle shudder at part throttle that was progressively getting worse. I had it almost since I had the vehicle but they never found out what the cause was because it never threw out a code and was hard to duplicate. I took the vehicle in the other day because of a scheduled brake fluid change and mentioned this again. When I picked up the vehicle, they told me that there is a bulletin out for this issue SIB 12 23 16 (.4) in which they performed a vehicle coding and programming for the fix. FINALLY!!!!

Then someone said that they couldn't find the SIB so I looked again:

I re-read my service write up and that's the correct SIB 12 23 16 0 .90

Hope this helps.
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      10-13-2017, 03:18 PM   #22
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Got my vehicle back from the dealership and I did duplicate the issue with the mechanic riding with me.

They replaced the transfer case unit., AT-Auxiliary transmission, and the transmission bearing. That fixed it. No more tugging/lugging just a nice smooth and powerful acceleration.
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