Gearbox Malfunction - you can continue driving

[Tici]

Hi all,

New to the forum and was looking at previous posts but couldn’t find anything for this code. Audi A6 saloon 2014 automatic gearbox;  the message pops up when driving “Gearbox malfunction you can continue driving” . Brought it over to the mechanic and the code is P171E00 - Transmission Input speed (RPM) Sensor 2 - No signal. My mechanic doesn’t fix gearboxes and the other ones I called are only going to replace the TCU for a hefty price. Just wondering if anyone had any similar experience. Car did kind of almost stop the other day at the light when I tried to move and suddenly jumped and reversed up itself. Now it’s gone and pops up every so often. I was told the car can stop suddenly??

As it is what I’m being quoted is around €1000 minimum to €3000 (Ireland) for TCU replacement. (165000km on the car; gearbox service done on 160000 km). 

[Steve Q]

Have you had another opinion from an Audi independent specialist or Audi itself? 

[Tici]

Different things, Audi garage won’t take it for another 3,4 weeks to even have a look at it. Some say it’s ECU but they’re not 100%, others that it could be gearbox dirty oil (but the gearbox was serviced recently) and then some that it’s just a sensor and to ignore it. But no one has had a look at the car (gearbox specialist) , all flat out for 3 weeks and won’t take it in.