New gearbox - now have issues with gears and cruise

[danny104]

All, I’m after some advice please. I have just had to have a 2nd hand gear box added to my a6 avant 2010 c6. Everything went well but now have the following issue-

The gear change selector on the LED display work as it should do for 1st - 3rd gear but as soon as I go to 4th it goes blank 4th and 5th gear is also the same but when in 6th gear it says I’m in 5th and need to change to 6th.

The second issue I have is cruise control works up to 3rd gear but then drops when go to 4th gear and can’t re enabke it whilst in 4th - 5h gear but works again when in 6th and car telling me to change to 6th from 5th.

There aren’t any loose wires, I’ve reset the systems by disconnecting battery for 10 minutes but still have this issue.

Has anybody every had this when changed a gearbox and if so how did you fix the issue?

Many thanks for you help in advance.

[Amo Zirins]

Did you done VCDS gearbox adoption?


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[Crasher]

Did you fit the same code gearbox?

[danny104]

No we haven’t done this as... as we only changed the gearbox and no sensors we didn’t think that this needs to be done

[danny104]

Yes I believe the same code gearbox was fitted as the old one had to be dropped to access the code for the replacement box.

[Crasher]

The full basic settings first to match the box to the new installation. Ideally you should have noted the coding value of the old one to make sure the new one is the same and if not, re code it IF it is a suitable box. If basic settings and a coding check to not help then you will need to investigate which box has been fitted and what the original was and make sure the new one is compatible.

[danny104]

Many thanks crasher I shall have a look later at VCDS and also see what the garage says again.

[danny104]

The garage have checked all the gearbox codes and they all match up.

Nobody can seem to help with what the exact issue is.

[Crasher]

Can you message me your cars reg number and try and find out the details of the donor car?

[danny104]

Many thanks, I have now messaged you the reg 👍