Tiptronic Help/Advice - 986 Forum - The Community for Porsche Boxster & Cayman Owners

pompous · 07-18-2011, 12:58 PM

He guys, my tiptronic started not going into 5th from 4th in auto mode. In tip mode, I could shift through all the gears just fine. Took it to my Porsche mechanic & hooked it up to the pst (sp?) tool & it had solenoid fault codes. Changed the fluid, but no change. I bought a used tip & installed it. Shifted fine for about 30 miles. The next morning it was back to being the same as before. Bought a torque converter, installed it, no change. Mechanic said the fluid is perfectly full and the car is not throwing any codes. He thinks i bought a bad transmission. Oh...the used tranny & TC are out of the exact same year box as mine. I'm at a loss. I don't think it's the TCM either, but I don't know at this point. Any help would be very much appreciated.

Jaxonalden · 07-18-2011, 07:06 PM

I have a Tip and this question will seem like a simple one but...does the trans have a computer that controls it? With all that's been changed, and it's still doing the same thing, it could be in the shifter, wiring or the computer.

pompous · 07-19-2011, 05:20 AM

It does have a transmission computer (TCM). The reason I don't think that is the problem is because it shifts through all the gears just fine when I put it into "manual" or "tip" mode. So, that would suggest (to me) that the computer is working to change the gears and I'm back to I guess not having enough pressure inside the tranny to shift into that 5th gear (which requires the most pressure & hence that one failing). Again, these are all guesses from me, as I really know little about transmissions.

Lil bastard · 07-19-2011, 09:17 AM

Bad shifter switch.

BTW, whoever counselled you to swap the tranny as a first course doesn't know squat about these boxes - get another mechanic.

Cheers!

pompous · 07-19-2011, 10:38 AM

Quote:

Originally Posted by Lil bastard

Bad shifter switch.

Cheers!

This would be such a relief!

Is this what mounts to the side of the transmission the linkage attaches to? If so...the new(used) transmission that was installed already had a different one on it. So, the old one(switch) was removed with the old transmission and not reused.

I thought I read about this switch causing the car to not be able to shift in manual mode rather than automatic mode?? My trouble is automatic mode from 4th to 5th. Still the same culprit...the shifter switch?

stateofidleness · 07-19-2011, 03:20 PM

*subscribed in case I ever run into this*

pompous · 01-17-2012, 02:57 AM

Quote:

Originally Posted by Lil bastard

Bad shifter switch.

BTW, whoever counselled you to swap the tranny as a first course doesn't know squat about these boxes - get another mechanic.

Cheers!

This did not correct the problem. Could it be the TCM, or harness even though it did not show any faults on the PST2?