Help! '08 Scud mis-shifting to neutral

My '08 Scud started to mis-shift into neutral while trying to shift gear, only at occasion. I shift again, and it goes back into proper gear normally, and then it shift normally again. F1 gearbox warning light also came on few times.

Took it into my mechanic, and SD3 showed two codes:

P1742 Selection Potentiometer
P1770 Gear engagements with wrong shifts

Clutch wear was showing 49.84% worn.

I had an actuator fluid flushed and bled; there was no leak. I drove afterward, and it is still doing mis-shifts with F1 gearbox warning light coming on again. Took it back to the mechanic, and it shows same two codes as above. In addition, this time Clutch wear is showing 100%; checked it twice.

If the clutch wear was still 49.84%, I would have thought changing an actuator to a rebuilt one would solve the problem, but this clutch wear of 100% within last 70 miles is confusing me.

My clutch wear a year ago (2500 mi ago) was at 43%, so I thought 49.84% was an expected number. I have no idea why 100% wear is showing now; can't imagine it being correct, but we checked it twice more with same readings.

Any thoughts on what may be going on, and whether I should try changing the actuator first or the clutch first? I hate to do both if only replacing one can solve the problem; it's very costly.

Thanks in advance for your input!

p.s. time like this I wonder if I should trade it in for a new GT3 that's sitting in the show room at a local Porsche dealer right now... But then, I can't imagine anything else replacing what my Scud can do when it's behaving...

 

How can I explain clutch wear going from 49% to 100% in 2 weeks?

 

Thank you for your inputs. He did suggest looking at the clutch from below and try to actually measure it directly.

Sounds like it's most likely my clutch? It has almost 16,000 miles.

Maybe I should get a second opinion?

 

Did you get it done at a dealer or an independent shop?

 

Definitely getting a new mechanic. I only ended up with him this time because the problem occurred on Sat, and he was the only local guy available to trouble-shoot. Fortunately, only spent money on changing the actuator fluid so far, but he was leading me down the path of changing the actuator + clutch, not guaranteeing the problem would be solved. That's why I posted this thread; didn't feel comfortable he was diagnosing this properly.

Thanks for all your inputs, and will post final resolution once I get it fixed properly.

 

New clutch took care of the problem!

 

Thanks!

New clutch feels so much crispier shifting!

Yup, was an expensive bill, but hopefully will last a while.