2008 Citroen C5 "Gearbox faulty"

[mf.lorant]

Dear All,

2008 Citroen C5 2.0 Hdi aut.
A few days ago when I drove out from the underground car park (quite a steep ramp) the car stopped with "faulty Gear or Gearbox faulty" and suddenly flashed a Sport mode and the winter light and I could just go in D3. Plus even associate all this with a rough grabbing when I tried to remove the gearbox for some other gear. I just finally drove out to the street and stopped the car. I restarted and everything worked normally. I went with it for a while in the city and from one moment to the next is the same as when I drove out of the garage. Until I drove home it did the same, flashing lights and D3. What could be wrong?
I look forward to your ideas!
Thanks in advance!

https://drive.google.com/file/d/0B_LUgM ... sp=sharing

[Stickyfinger]

Needs a Lexia session to really know ? do you have access ?

[mf.lorant]

I went to a dealer, they checked the fualt codes, they did a few rides, but the car went normally with no faults. They cleared the codes and tomorrow they give a few more checks and then we'll see.
For the moment that's all, but I'll tell them to change the gearbox oil, just to be on the safe side.

[Stickyfinger]

Advice here will tell you:

it is VERY IMPORTANT that they use the 100% correct oil, even dealers are known to get this wrong....it is worth making sure they know this.

To correctly change the oil , you need two changes and on the third a new filter. (it does not drain fully)

?? did they not say what the codes were ?

[vborovic]

It can be done in one go with the "hot flush" method, but it will take 10-12 liters of not-exactly-cheap gearbox oil to do it properly

[mf.lorant]

They said that for the first sight it seemed to be something with the crankshaft sensor or something like this.

[xantia_v6]

Next time the codes are read, try to get them written down so that you can share them here. Your dealer may be right with their diagnosis, but a second opinion doesn't hurt.