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996 tiptronic slipping diagnostic - help please 🙏

By Jamie220
November 6, 2021 in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)

https://www.renntech.org/topic/55480-996-tiptronic-slipping-diagnostic-help-please-%F0%9F%99%8F/

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Jamie220

Posted November 6, 2021

Hi All,

My 996 from 1999 was parked for a few weeks and now on first ride started slipping on acceleration in all gears until it gets up to 5 and locks the torque converter.

By slipping I mean the engine revs go up, but the car does not accelerate.

Gears switching nicely from 1 to 5 with manual setting. Fluid levels checked and are correct.
I’ve recently changed the fluid (c2000 miles ago, ZF factory fluid spec).

Any troubleshooting ideas what this could be?
Is it as simple as clutch packs suddenly stopped holding - if so which one or all at once?

What to try before dropping box for full rebuild?
is it more the torque converter or the gearbox?
but if gearbox clutches then why did it start slipping in all gears?

attaching few picks from diagnostic tool.
the speed in km/h most certainly incorrect (too low) and the plate angle was probably different between the picks (?).

also had this code on torque converter solenoid clutch, but it did not reappear after reset.

thanks a lot for advise,
jamie