My 2004 Audi A6 tdi can only get up to 2nd gear in auto or tiptronic. Auto gearbox garage said it is the engine - VW/Audi garage said engine is ok. No fault codes or dash warnings. was on the motorway when lost the drive. Any ideas please before the car goes to the main dealership. Thanks, Tim

Not an uncommon problem for Audi owners. There is a way to override the park lock function bu this is a quick fix - you will need to diagnose the core issue with the selector being locked out. This might be of help to you -

Audi A6 C5 1997 2004 Why is My Auto Gearbox Stuck in Park

you have to update the program to adapt with the new gearbox, by visiting the nearest agency or specialized workshop.

It is imperative you use the correct fluid in your Audi tiptronic transmission. Look in your owners manual for the correct fluid. If you do not have an owners manual call your local Audi dealer or better yet drive to one and purchase Audi Pentosin A/T fluid from the dealer. Do not use Dexron III as it is not designed for the Triptonic transmission. A transmission is very expensive to replace so do not take any chances and just buy your fluid from your Audi dealer even though you may pay a little more. That way you are 100% sure you are using the correct fluid.

Manual gearbox- SAE 75 W 90 Synthetic. Auto Gearbox- VW ATF only available from Audi dealers. Differential SAE 75 W 90 Synthetic.

It sounds like who ever rebuilt it forgot to line up the gears in the gear box. You might see if they can redo it for ya, tell'em to take there time and slow down, an you should be alright.

You need to give the car a scan, preferably with VCDS (or VAS at a dealer). If limp mode is activating (lit up gear selections), then it will be storing codes.
The fact that it works to a degree could be good news, the gear box has likely not failed. Could be the F125 selector switch, which is a common fail at this age.

Have you had the vehicle put on a diagnostic machine, does the car feel slugish, any lack of power, we have seen a lot of these vehicles with air mass sensor faults. When they fail they do not show a code but with the right scanner they can be seen not working. This affects the gearchange because the ecu does not have the correct data to shift. Of course it could also be the transmission is in need of overhaul. but i would take it to a good diagnostic garage first. It is not uncommon for the air mass sensor to fail after it has been disturbed or knocked in the workshop. we have never found out why.

hi,i'm ck .my audi c5 2.4 model 2001, when put on D while driving, it go to neutral?

I have been having similar problems. The clutch is slipping as thats how you get the variable gears when in full auto, but this is where the problem comes from, some garages (auto gearbox specialists) are now able to fix it. Do not go to Audi as all they do is replace the gearbox (very expensive). There is no quick fix though! Sorry for the bad news!!

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