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SOLVED

Following on from my previous post. The solution to the gearbox fault caused by the 23X4 software update is to reverse the TCU software back to the previous version.

After the 23X4 software update was carried out by VW the software versions on my vehicle were:

ECU - 7728
TCU - 1637

Reversing the TCU software back to the previous version, which is version 1431 removes the gearbox fault. This returns the vehicle back to the condition it was in before the 23X4 update. I did not change the ECU software, only reversing the TCU software is required.

My advice to anyone reading this who is experiencing the same problem after having the 23X4 update carried out by VW is to not listen to them and not let them touch your vehicle. Certainly do not let them replace the AUX pump. Find a tuning garage local to you that has the ability to reverse the TCU software.

After nearly two weeks of arguing with VW, they would not listen to me and their "technical department" insisted that the software could NOT be reversed and the AUX pump would need to be replaced. This is complete rubbish, of course the software can be reversed. I took my vehicle to a third-party garage who reversed the TCU software back to the previous VW version in less than 10 minutes, problem solved. VW do not want to take responsibility for the problems caused by the 23X4 update and will insist it is not the software that is causing any issues.

For anyone in the UK you can raise a complaint to the VW customer service team, the number is 0800 083 3914. Once you have raised the complaint you need to request to escalate it to the executive office. This bumps the complaint up to the head office and a case handler will be assigned. The more people that highlight this issue to VW the better.
i have the same problem mate, is it possible to get the file of your "1431" version? i need it to write it on my dsg.... thanks in advance
 

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hello all, i finally solved the problem with an automatic update with the launch tool.

Since I didn't know the previous version of the sw, I tried one of the options you gave me. the fault has been removed automatically. anything that can help you...
Greetings to all and thanks for the information. without your info, it would have been impossible to solve it.
 

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Still trying to 'fix' the 23X4 software update. The VW dealership has tried to cooperate and today has checked via ODIS the software version for system GSG DQ381, i.e. the DSG gearbox, following the update - this is showing 1644. They say the previous version, before updating, was 1406. They haven't given me a read on the ECU - the service manager seemed vague on this point.
These numbers are different from those given by others here - presumably a different variant.
Basically, I'm trying to identify the original factory software versions to get the car back to unmodified original state. Any ideas how I can do that?

The dealer has claimed no knowledge of the purpose of 23X4 and VW Customer Services say they have no idea either. Seems fishy.
 

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From a quick reread of the thread this post is about the 7 speed dry clutch DQ200 box, the 7 speed wet clutch DQ381 is an entirely different design made by a different outside supplier
 

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Thanks for the reply. Yes, according to the ODIS print out, my car has the DQ381 gearbox. Same campaign update has been applied - 23X4. There's no fault showing but this has resulted in a major change in gearbox behaviour - it now seems as though S mode has been completely deleted. I'm wanting to get back to where I was.
 

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I am not at work until next Thursday so I can’t check on ELSAPRO to see if you previous software versions are available and I am still getting used to doing Flash Programing using ODIS as I have not been able to get on a trying course for one reason or another so at the moment I am completely self taught on ODIS but I have all the Flash data saved on my system at work.
 

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That's good of you to offer to look it up. My car is a 2018 Golf Alltrack 2.0Tdi 184 DSG 4-motion. If you need the VIN, I could try to PM it to you.

The VW dealership of course says it has no way to revert the software, and probably wouldn't do it on principle even if they could. There are plenty of auto tuners in West Yorkshire and I'm hoping one of them will be able to reflash the factory versions, at my expense obviously. (I'm not looking for any performance tuning, just want my car back the way it was). Oh and there's been no explanation of the reason or purpose of the 23X4 revision and apparently no-one else has complained....
 

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Thanks for replying. Any particular reason for suggesting an APR agent, as opposed to others?

From reading earlier posts in this thread, 23X4 involves a change to both engine (ECU) and DSG (TCU) settings. Although it's the DSG changes which are annoying me, I assume it would be the right thing to reflash both ECU and TCU back to factory settings and not just the TCU. Does that make sense?

Do you have any idea of what VW is trying to achieve by modifying a 4 year old car which is out of warranty?
 

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I am an APR agent and have installed and used the software myself; I have no idea what they are trying to achieve, probably chasing some crazy EU CO2 mandate…
 

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So an update. The VW dealership says the previous TCU software version was 1406. Today I've been to two garages, the second being a VW auto electronics specialist with a full range of tuning tools and access to several databases. There were 13 software versions available prior to the one installed by the 23X4 update (1644) but 1406 was not among them. 1405 is the closest, but who knows if that is a suitable one to roll back to? Unsure where to go from here.
 

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Getting out of my zone of experience, my software abilities are limited to what VAG provide via ODIS or the tuning software from APR.
 

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No worries. As I understand it, ODIS won't allow a rollback. With APR, you buy a remap and if necessary it can be rolled back at no extra cost. Unfortunately, neither of these fits what I need. Haven't given up yet though.
 

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Hi all...I also had this exact same issue on my wife's Golf 2017 R Line 2.0TDI DSG with the DQ381 box.

We had the 23x4 update applied mid March and about 4 weeks later the issue arose. Checking fault code it showed the same as the OP. Over the past 4 weeks or so...VW ran diagnostics, checked the shaft the pump slides on/into and then replaced the pump itself. They only charged us £450 as they made labor FOC due to the fact it didn't fix the issue, but they fitted the original pump back as the replacement made no difference - so if anyone wants a pump...we currently have a spare! :D

Following this VW suggested replacing the mechatronics, or failing that a whole gearbox - clearly with the costs, we tried pushing for goodwill, but got nowhere as the car was bought privately and is outside of any warranty.

After finding this thread, we took the car to a local remapping company I'd used on other cars in the past and they managed to role our TCU (not the ECU), back from 1638 (which was what we'd been updated to in March), to 1401 like others on here had success with.

So far we're driving error free, however this was only completed yesterday morning and we've only driven about 100 miles so far...however, previous attempts to clear the codes resulted in them coming straight back after turning the car on again - so I'm hopeful it's fixed the "issue".

What bugs me though, is what had changed in the software? Is there an underlying issue with our car, which the old software simply doesn't detect? Or is the newer version, just buggy code?

I had a case open already with VW UK Customer Exec team, so I've raised this with them and am hoping that once a month has passed by, we can agree the rollback fixed the issue and I'll start trying to claim back the costs we've incurred. I'm also aiming to get the car under the VW 2 year all in service and warranty plan available - however as we've "touched" the TCU version, this could be an interesting conversation with VW.

My own car is an Octavia VRS, same engine and also DSG, also a 2017 model so the above experience made me nervous of not having a warranty myself, so my Octavia is now on the Skoda all in plan, so at least i have some comfort there - however, during their eligibility check they updated my software to 23x4 as well...so will be interesting if mine runs like normal or if it experiences similar issues. Only difference on my Octavia is I have the 6 speed box DQ250-6F.

Hope this is of some use to people and thanks for the OP for starting this topic up and to all those who contributed their success or attempts to resolve.
 

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Hello All

I have the same issue with my 2018 Golf Alltrack 7 , 2.0 TDI DSG, DQ381 Gear Box, 48000 km
Error P0C2900, Gear Box error, You can drive on.
Beginning of May I had periodic check of may car and VW installed some software update.
After driving 120km i got the error.
I have visited already 2 VW dealers to confirm the issue.
Both confirmed:
This error means that car computer analysed that hydraulic pump rotation speed is not according require value.
Possible causes:
  • broken shaft
  • hydraulic pump fault
  • mechatronic module fault
One of dealer has already under repair the same spec Golf like mine with the same error code.
-They changed already the pump - after the while error pop up again
-most likely is not the mechatronic and they are still working to fixed the issue - is what they say today (02.06.2022)

Best Regard from Cracow/Poland
 

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Hello All

I have the same issue with my 2018 Golf Alltrack 7 , 2.0 TDI DSG, DQ381 Gear Box, 48000 km
Error P0C2900, Gear Box error, You can drive on.
Beginning of May I had periodic check of may car and VW installed some software update.
After driving 120km i got the error.
I have visited already 2 VW dealers to confirm the issue.
Both confirmed:
This error means that car computer analysed that hydraulic pump rotation speed is not according require value.
Possible causes:
  • broken shaft
  • hydraulic pump fault
  • mechatronic module fault
One of dealer has already under repair the same spec Golf like mine with the same error code.
-They changed already the pump - after the while error pop up again
-most likely is not the mechatronic and they are still working to fixed the issue - is what they say today (02.06.2022)

Best Regard from Cracow/Poland
Update(corrected)
Workshop checked the auxiliary oil pump(electric motor), all OK.
They checked also from electric side - all OK
In my case most likely it is ->Auxiliary Hydraulic Pump(NOT electric motor)-> already one confirm case in my area. There is also VW technical bulletin dated end of May 2022 describing the repair procedure
Problem with Auxiliary Hydraulic Pump-> the mounting screws can be loosen and then the pump is not functioning correctly/damage to gearbox
Unconfirmed information: it was already service action in Germany regarding this issue, not Golf only Pasat.
 

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Update(corrected)
Workshop checked the auxiliary oil pump(electric motor), all OK.
They checked also from electric side - all OK
In my case most likely it is ->Auxiliary Hydraulic Pump(NOT electric motor)-> already one confirm case in my area. There is also VW technical bulletin dated end of May 2022 describing the repair procedure
Problem with Auxiliary Hydraulic Pump-> the mounting screws can be loosen and then the pump is not functioning correctly/damage to gearbox
Unconfirmed information: it was already service action in Germany regarding this issue, not Golf only Pasat.
Pump changed, error gone, 1400 EUR gone.
 

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I just took my 2017 7.5 Golf TDI to a Volkswagen dealer in Australia for a routine service. Despite asking them not to apply updates they applied an engine control unit update 23x4, and a gearbox control unit DQ381 update. Here is what I've noticed in my first 2 hours of driving:

1. From stationary to moving forward or reverse with no accelerator the car picks up a lot more speed (the RPM is higher). The stationary idle engine speed is the same as before the update. The car may feel ever so slightly faster 0-5km/h but greater brake pressure is required to stop.

2. Gears change up at slower speeds. 1st gear may hold to a slightly higher speed but 3,4,5,6, and most notably 7 engage at slower speeds. As a result the car feels a bit laggy and sluggish.

3. The gear box moves up a gear when slowing down or rolling down hills resulting in less effective engine braking. This along with point 1, I'm expecting greater brake wear.

4. The turbo doesn't seem to be as potent, there is extra lag and the car no longer feels "unstoppable" when asked for brisk acceleration. This is the most disappointing experience for me.

I guess I'll learn more as I drive further...
 

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Finally, today, I've had my car (2018 Golf Alltrack 2.0TDi 184 DSG) reflashed to original stock software versions for both ECU and TCU, reversing the 23X4 update. Relieved to say that it was immediately obvious how much better the car drives on the original software.
It has taken me 4 months and 2 false starts to find someone able and willing to do it.
 
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