A6 3.0 Bitdi Gearbox Slip PLEASE HELP :(

as soon as i am free to get it in, they have the file ready, but its about getting the time to squeeze it in around Christmas.
i am ring them this afternoon as i sent over the full excel file from all the diagnosis above, to see if they can identify from that.
i was thinking could it be a possible toque converter issue?
 
I thinks it’s highly likely it’s your torque converter.
Possible seal pressure leak
 
ok so another update, rang my tuner, they have looked at a full 30 min drive diagnostics chart i sent them, it looks like my transmission oil temps are very very high recommend max is 120 degrees c and apparently mine is running up to 185 degrees! this indicates that the oil is destroyed or on its way to being! also he seems to think the 'mechatronic' unit pistons or seals are perished, so he thinks a mechatronic repair and oil change will more than likely resolve the pressure and 'bite' of the clutches engaging and reducing the slip.
 
  • Like
Reactions: blackwood
I find it really hard to believe that the gearbox has mechanical problems! The ZF gearbox is really really hard to destroy!

This morning I had two bitd's for gearbox updates, a prefacelift (221k km's) and facelift (180k km's). The PFL was a stage 1 with 380hp. The FL had a stage2 with 410hp. After the updates a took them for a testdrive and they drove really great. Smooth shifts, great power response and no fluctuations.
 
  • Like
Reactions: blackwood
that is so odd then! they clearly are robust boxes! i must have a very unlucky fault somewhere! mine is only sat at 360/370bhp its a gentle stage 1.
its so strange!
 
Ok so if anyone who is following wants an update.
Issue is still on going, tried various recaps and gearbox adaptations, clutch pressure adjustments and the like.
I have had it to a ZF gearbox specialist, he knew this box inside out has had many he had repaired and rebuilt, he said 100% the slip isn’t right, but there is no faults on the box did a full oil change and service and the oil was clean not burnt, and no metal in it.
He said it is a software issue, and some signal is telling the gearbox to slip, rather than a mechanical fault.
I have now had it back to the mappers and had it put back completely to stock, and the issue is still there!
so yeah no further forward! Booked in next week to ZF again, anyone else have any ideas? Any silly sensors we may have missed? Anything at all? cheers
 
Is that sensor in the box itself? I did consider that, I changed the abs/wheel sensor as it was faulty, thought that may have affected it
And yep software is up to date Audi stock now on both engine and gearbox
 
  • Like
Reactions: blackwood
another update, the gearbox guys have checked it over again, and said could be a Mass airflow sensor issue as the requested value and the actual value are about 25% out, any ideas if that could be it?
 
  • Like
Reactions: blackwood
Sounds very possible.
I have read somewhere the MAF affects the ZF transmissions as they are computer controlled and load (maf) based.
New MAF and you might be golden.
 
  • Like
Reactions: blackwood
Well I think it’s worth it for the sake of how much they cost, other than that next step is to strip the gearbox and physically check the clutches, torque converter etc for damage :(
 
  • Like
Reactions: blackwood
When the clutch has starting to slip they are broken and needs to be replaced.
Just like an old gearbox on a US car.
When it slips they will wear out right away
 
audi upgrades
Hey

nope, the ZF transmission specialist said the clutches show no sign of wear, and no burnt oil, no metal filings and no fault codes, so they say it isn’t clutches, they think it’s stuck in “learning mode” plus it only does it at 15mph all other gears and speeds are fine no sign of slipping so they said can’t be the clutches :(
 
  • Like
Reactions: blackwood
blackjakle said:
Hey

nope, the ZF transmission specialist said the clutches show no sign of wear, and no burnt oil, no metal filings and no fault codes, so they say it isn’t clutches, they think it’s stuck in “learning mode” plus it only does it at 15mph all other gears and speeds are fine no sign of slipping so they said can’t be the clutches :(
Click to expand...

Okay, that's good to hear
 
audi upgrades
Bit of Thread resurrection here! But did you get to the bottom of this in the end?
 
  • Like
Reactions: blackwood
you've bought a second hand car which you've got no idea how it was driven before you... the box could have so much slack in it to start with depending upon the original owners driving... even though they state 1000NM max that is under optimal conditions..
 
Hello everyone and
blackjakle said:
I think I would rather it was that! Be much easier knowing :( well more testing I guess .....
Click to expand...

Hey, I've got 2014 a6 c7 3.0 bitdi with ZF 8HP55 HIS gearbox. It is HIS, because we've got start/stop system. And I think I have a very similar problem to yours, @blackjakle, I think it slips each time when going slowly 0-50 km/h from a green traffic light. Basically 2-3-4 gears. But 4-5 gear switches more adequate.
Got no chip or anything tuned, all stock.
Visited Audi service few months back, they said they noticed something and updated the gearbox's software.
I can't say I noticed any much of difference.
Replaced oil later, 2 times - 1st time as a partial change with ZF original oil, 2nd time by a machine change with VAG original oil.
After oil change, noticed that during colder months even after 5 min warming up, when switching from P to D, it kicks 1-2 seconds later.
Went to ZF service, they said all indicators are good, you can drive. In order to determine the problem, they would need to take car for 2 weeks, get mechatronic off, send it somewhere for testing and repair if needed. Sounds pretty boring.
I think it's also kinda slow, when in "AUTO" mode and push accelerator fast, it lags too much for me, I think it takes around 2 seconds to switch to a lower gear(s).

Can we do anything about it without disassembling the gearbox?

1622573514598
 
Hi guys,
It’s been a while since last update in this thread…
I’m facing the same slipping problem with my bitdi 2015 since almost one year. No fault reported by OBDeleven.
Does anyone know by chance what’s the end of the story and how it has been fixed??
Thank you for the help!!
 
Howdy. I have the same problem, I skate at 1,2,3. I have a box zf 8hp audi a6 bitdi 2013. I changed all the clutches in the box, I redid the converter, I changed the valves to megatronic, total cost 3500 euros. After all that, I have the same problem! very sad, I have the original software on the box and on the engine and it still skates... has anyone solved this problem? I don't know what else to do
 
Hi guys,
i’m having the exact same problem on my bitdi FL 2014/11. No error reported, oil changed, gearbox reset without any change. Did Anyone find de the root cause?
That would be great to hear the end of the story!
 
Occ31 said:
Hi guys,
i’m having the exact same problem on my bitdi FL 2014/11. No error reported, oil changed, gearbox reset without any change. Did Anyone find de the root cause?
That would be great to hear the end of the story!
Click to expand...
If you have a VCDS scan can you post it?
 
Cannot go that way. I don’t want to have the diesel gate update (23X6) installed. It makes the engine/transmission behaving incredibly bad.
There are multiple threads discussing this slipping problem in different countries but unfortunately none gives the solution
 
You do realise Audi makes updates to fix bugs (or sometimes introduces them haha) but the above versions I have tested and they work fine.
 
ukando said:
Hello everyone and


Hey, I've got 2014 a6 c7 3.0 bitdi with ZF 8HP55 HIS gearbox. It is HIS, because we've got start/stop system. And I think I have a very similar problem to yours, @blackjakle, I think it slips each time when going slowly 0-50 km/h from a green traffic light. Basically 2-3-4 gears. But 4-5 gear switches more adequate.
Got no chip or anything tuned, all stock.
Visited Audi service few months back, they said they noticed something and updated the gearbox's software.
I can't say I noticed any much of difference.
Replaced oil later, 2 times - 1st time as a partial change with ZF original oil, 2nd time by a machine change with VAG original oil.
After oil change, noticed that during colder months even after 5 min warming up, when switching from P to D, it kicks 1-2 seconds later.
Went to ZF service, they said all indicators are good, you can drive. In order to determine the problem, they would need to take car for 2 weeks, get mechatronic off, send it somewhere for testing and repair if needed. Sounds pretty boring.
I think it's also kinda slow, when in "AUTO" mode and push accelerator fast, it lags too much for me, I think it takes around 2 seconds to switch to a lower gear(s).

Can we do anything about it without disassembling the gearbox?

View attachment 237864
Click to expand...
hello, did you solve the problem? if so can you tell me too?
 
You must log in or register to reply here.

Similar threads

Sender
Please help!! Audi A6 2012 3.0 biTDI
Replies
4
Views
5K
Sender
Sender
Sender
P054400 Audi A6 2012 3.0 biTDI
Replies
0
Views
3K
Sender
Sender
blackjakle
A6 3.0 Bitdi Stage 2 Performance Parts
Replies
7
Views
4K
blackjakle
blackjakle
S
New project - A6 Allroad 3.0 BiTDI work horse
Replies
5
Views
2K
Sandra
Sandra
Buxton2901
Bitdi gear changes help please
Replies
37
Views
5K
Burla.beni
Burla.beni
Top
Back