Need help w/ tiptronic

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Apr 2, 2006 | 12:06 PM

flatsixx

Thread Starter

6th Gear

Joined: Oct 2003

Posts: 6

Likes: 0

Need help w/ tiptronic

I have a 2002 C4S with tiptronic. Sometimes, in 3rd(manual mode) at 20-30 mph if I try to accelerate there's a grinding noise under the car. Also when it's in auto mode with slow cruising speed - again at 20-30 mph(still in 5th)and I give it a little gas. There's again a grinding noise from under the car. Should it stay in 5th in such a low speed??

The problem started back in 2002 when it had less than 600 miles. The dealer changed transmission flulid and the problem seem to be solved. Now at only 3,500 miles, here it is again.

The Porsche dealer is having trouble fixing this. Has anyone seen this problem, so that I can give the Porsche dealer a pointer?

Shin

Apr 2, 2006 | 08:01 PM

JasonAndreas

Technical Guru
Rennlist Member

Joined: May 2002

Posts: 8,138

Likes: 122

From: USVI

Quote:

Originally Posted by flatsixx

The reason for this is the adaptation of the torque converter lockup clutch in the Tiptronic control unit. If the 996TT is driven in a restrained manner or is frequently driven in stop-and-go traffic, the Tiptronic control module adapts itself to unfavourable values that cause the grinding/rattling noises.

Quote:

Originally Posted by flatsixx

The Porsche dealer is having trouble fixing this. Has anyone seen this problem, so that I can give the Porsche dealer a pointer?

Its a well known problem and the "fix" is to install a new Tiptronic control unit with modified software. The newer control module has the part number 996.618.180.04 (or greater). I just noticed that you have a 996 C4S and not a turbo so you want a control unit with the part number 996.618.180.07 or newer. Have your dealer look at the Technical service bulletin 6/02 - 3701, dated February 14, 2003. With the TSB and prior (wrong) attempt at fixing the problem you should be covered under warranty.

Apr 3, 2006 | 11:14 PM

flatsixx

Thread Starter

6th Gear

Joined: Oct 2003

Posts: 6

Likes: 0

Need help w/ tiptronic

JasonAndreas,

Thank you very much for your help

. I found TSB:3701 on rennTech and I believe it is the problem. Now, the hard part is the deal with my dealer. My car ran out of warranty a year ago and I'm sure it will be such a pain to get them covered for the problem.

Anyway, Thanks again

Apr 10, 2010 | 06:09 PM

kent

Racer

Joined: Oct 2009

Posts: 304

Likes: 1

From: los angeles

hello guys, i found my car has this problem once a few days ago, so how i can get my car to fix? going to the dealer or any good indy shop ? thanks in advance.

May 3, 2019 | 03:43 AM

Ji H. Jung

3rd Gear

Joined: Apr 2019

Posts: 3

Likes: 0

Hello there~

I assume that I have same issue on my 996TT, Did you solve the problem by updating a TCU module??

May 3, 2019 | 07:28 AM

Timothy Kee

AutoX

Joined: Jan 2016

Posts: 13

Likes: 1

I had the same grinding noise. I just avoid accelerating in high gear by shifting down. Problem solved.

May 3, 2019 | 07:11 PM

cdk4219

Rennlist Member

Joined: Apr 2012

Posts: 1,339

Likes: 340

Thanks for replying to a 13 year old thread with a fix to avoid the grinding by not accelerating in high gear. If your wipers stop working it can be fixed by moving to the desert.