So I have a 2014/15 a6 c7.5 with the 7speed automatic gearbox. The issue I’m having is the car lurches forward and has a slight clunk when it shifts from 2nd to 1st. shifting both up and down in every other gear, including 1st to 2nd is completely faultless. Cant even feel the gear change most of the time. 
 

now I have a slight feeling that it slightly low on oil as there’s a slight leak. So have already booked in for a gearbox oil change. 
 

that being said, I’d like to know if I’m missing anything or there’s any common issues

thanks in advance 

It may well be lack of oil causing the fault, so that's the first thing to sort out before looking further. If that does not cure it the next thing to look at is the mechatronic control module, though be warned repair will be expensive.

Yeah I’m hoping it’s not that 🤞 but it’s booked in at Audi on Monday for a gearbox oil change so will find out from then 

So had the gearbox oil change done at Audi on Monday, it’s now Thursday and nothing has changed. It still lurches between 2nd and 1st and I have to leave it idling for about 10 mins in the morning or the engine will occasionally stall. I’m guessing these two are related the engine runs smooth. And once it moves it doesn’t try an stall again 

Sorry to hear that Tom,

When you booked the car in to the Audi dealer, what was your request to them for what you wanted done, and did you clearly explain why - i.e. the symptoms you were experiencing? 

Good point made by Magnet, obviously the Audi Tech didn't road test your car after oil and filter change. That's where dealerships fall down with everything done on the clock....time is money. Didn't you notice the fault after you'd collected the car from the dealer?

I didn’t mention the issue as unless I need to I refuse to pay the labour that Audi charges and generally try and do the work myself. Although I have a Audi specialist near me that I’m planning on booking in to get diagnosed 
 

The clunking between 2nd and 1st only happens when the gearbox is completely up to temp and as I only live about 5 miles away, it wasn’t warm enough for it to happen. The stalling out also didn’t happen as that will only happen when the cars been sat overnight. 

Edited October 10, 2025Oct 10 by Qwerty246

What mileage has your car covered???

I’m not sure I follow your logic of not informing the dealer of your reason to ask them to change the gearbox oil - and refusing to pay labour charges. 

57 minutes ago, Desperate Dan said:

What mileage has your car covered???

Coming up to 110k

20 minutes ago, Magnet said:

I’m not sure I follow your logic of not informing the dealer of your reason to ask them to change the gearbox oil - and refusing to pay labour charges. 

As the car is a 64 plate (2014/15)  it’s not covered under any sort of warranty. And the Audi near me is charging £190 an hour. I don’t refuse to pay for labour. I refuse to pay £190 an hour for labour when the specialist would do just as good of a job for about £100-£140 an hour (haven’t spoken to them yet to be certain of their hourly charge) 

Knowing that the local specialist charges less per hour than a main dealer, why did you still choose to go to the dealer?

2 minutes ago, cliffcoggin said:

Knowing that the local specialist charges less per hour than a main dealer, why did you still choose to go to the dealer?

For multiple reasons

1- it’s closer than the specialist to both my house and work 

2- I was a reasonable price as I’m not messing around with the procedure of changing the gearbox fluid myself. 

3- they do a health check on the vehicle and tell me any obvious faults so I don’t need to find time or sort a lift or pit out to properly check 

4- as my car has pretty much full Audi service history and I might have misplaced the history, I got them to print out the history again for me 

So you chose the main dealer for its convenient location and its provision of such things as the "health check", yet you are not prepared to pay the bill? Or have I misunderstood something here?

Edited October 10, 2025Oct 10 by cliffcoggin
correction

1 hour ago, cliffcoggin said:

So you chose the main dealer for its convenient location and its provision of such things as the "health check", yet you are not prepared to pay the bill? Or have I misunderstood something here?

I’ve never said I’m not prepared to pay the bill. I’d pay the bill to find the issue. It’s more about being smart with money and not throwing it down the drain. there’s an almighty difference between spending £250 on a gearbox service and spending £190 an hour for however long until they can diagnose the issue. 
 

with that being said, the thread has gone off course. The reason I take it to one place or why I’ve taken it to Audi for one thing but not the other isn’t really the point of this thread. End of day, if you don’t have any ideas about possible issues or ways to repair it. There’s really no need to comment. 

110K... You could be looking at a worn or faulty torque convertor, especially if it stalls when cold. Rather than go back to Audi at £190 an hr, find a Transmission/Gear box specialist and take it there for diagnosis. These guys strip down auto boxes all day everyday and will be very knowledgeable and cheaper than Audi Main dealers. Let us know what the result is, good luck.

Thanks for coming back Tom. My point is this:- 

If you simply asked them to change the gearbox oil without revealing any reason why, then you don’t have any redress for the fault remaining as was, or your reluctance to now pay an additional cost for a diagnostic check - for which understandably you would have to pay for. 
Apologies if I’ve got this wrong, but that’s my interpretation of what I understand you have said. 

10 hours ago, Qwerty246 said:

I’ve never said I’m not prepared to pay the bill.

It read to me that you were not prepared to pay the bill, but I am glad that's not the case because that would be fraud.

If you really want to be smart with money why take an eleven year old car to Audi? That does not make sense. Go to an independant VAG specialist or in this case a gearbox specialist as suggested by Chris, but never an Audi dealer.

15 hours ago, Magnet said:

Thanks for coming back Tom. My point is this:- 

If you simply asked them to change the gearbox oil without revealing any reason why, then you don’t have any redress for the fault remaining as was, or your reluctance to now pay an additional cost for a diagnostic check - for which understandably you would have to pay for. 
Apologies if I’ve got this wrong, but that’s my interpretation of what I understand you have said. 

I didn’t mention the issue as the car was due a gearbox service, as well as that I know there was a slight leak, so as I have had the car about 9 months, I put two and two together and decided that the best action was to get the service done and see if low oil was the reason for the issue. To which I now know wasn’t the issue. I understand that now i have to pay a diagnostic fee but it was worth trying the cheaper options first.  

14 hours ago, cliffcoggin said:

It read to me that you were not prepared to pay the bill, but I am glad that's not the case because that would be fraud.

If you really want to be smart with money why take an eleven year old car to Audi? That does not make sense. Go to an independant VAG specialist or in this case a gearbox specialist as suggested by Chris, but never an Audi dealer.

To me as it was due a gearbox service and there’s a slight leak, it was worth trying the cheaper options, so I don’t spend triple the amount to potentially find out it was just low on oil. Now I know that low oil wasn’t an issue I can confidently know that there’s an actual issue and spend the diag fees at either a vag or gearbox specialist to find the actual problem