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996 tiptronic upshifting poorly

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2002 c4 tiptronic. Noticed problems with delayed upshifts. Particularly noticable if you pull away briskly and there is a pronounced delay in upshifting when you get off the gas. Car hangs in gear before upshifting to next gear for up to 10 to 15 seconds.

Any help with why this is happening and how to diagnose?

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Does it do it all the time? Does the tranmission enter the reduced driving progam ever? Where the D and 4 light flash back and forth? That would indicate an electrical fault within the tranny.

10-15 seconds is an awefully long time to shift. Does it take that long in both Manual and Automatic mode?

I suggest you get the tiptronic code history read to see if there are any faults. You may want to get the tranny fluid changed to depending on how old the current fluid is.

Another option is the reset the memory by unplugging the battery temporarily, and then letting the tranmission relearn you driving style.

I've noticed that when my car is cold, the transmission tends to stay in the lower gear longer before upshifting, especially when i lift, but no where near 10-15 seconds.

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This is a new problem so I will look for these items. Car has 56K miles and I have only owned for 9 months so don't know full repair history. Was considering having the 60K service done a little early before I drive the car after winter is over. I am aware of a couple of companies that sell systems for reading codes so I thought I would pick up one so I can stay on top of things better. Thanks for the advice. It gives me a place to start.

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I have the same tranny. When you drive aggressively a more aggressive shift map (not sure this is the actual term) is engaged. If the system senses that you are racing then it will tend to keep you at the highest revs possible for obvious reasons. This caused me some alarme when it first happened to me, but I've had the car for four years, and it only happens when I really get super aggressive in chasing someone down and blowing by them.

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