AN UPDATE & SOLUTION:
Hi Guys,
After a few months of struggling with that issue, after reviewing tons of YouTube and forums comment I've finally solved the problem with that error.
If the steps mentioned in my post above may work for a temporary time - like it was in my case, especially that DSG TCU reset procedure - but may not work permanently, try this way:
STEPS TO SOLVE THE ISSUE:
Info: First of all, this issue is hard to diagnose as it is random, not a routine issue. To me it was first every few weeks, then every few days, then like every 10-100 kilometers of driving.
1. When you observe the issue, do not turn off the engine and connect a professional grade! diagnostic computer (not some cheap or free ODBII tester or application - as they may show you nothing) to your car to read the error codes. The cheap or free ODBII testers will show you s***. If you do not have such professional grade equipment, find a car workshop who has such and then leave them your car to drive a bit (in my case it was a 300 kilometers) to observe the issue and read the error codes by such professional grade diagnostic computers. Somehow the free or cheap ODBII testers will not read that error codes - I tried with such different apps on my smartphone and they show nothing. The reason may be that the Audi has two computers - ECU (a standard computer), but for DSGs there is a second computer, a TCU (Transmisson control unit - a gearbox computer). Agree with the workshop that they will perform a longer test drive (as I mentioned in my case it was 300 kilometers, I paid for the full tank of a fuel, and agreed that the boss of the workshop may use the car on a daily basis for a week to be sure to observe the issue and next to be sure that the issue disappear).
2. Let the workshop to fix the issue based on the diagnostic data. The potential reasons for the problems as described by the workshop were:
- mechatronic unit to replace (a few thousands of $ in Audi official workshop or a mechatronic replace kit (a few hundreds of $) - THAT WAS NOT A PROBLEM, THIS DID NOT SOLVE THE ISSUE
- a solenoid near to the gearbox and a wire & it's connector where the cooling fluid gets into and create a short circuit which causes the issues - THAT WAS NOT A PROBLEM, THAT DID NOT SOLVE THE ISSUE
- one of the electro-valves was broken (the professional grade diagnostic computer shows that error - with the info which valve exactly it is, as they are multiple in the DSG), the replacement of that electro-valve in the DSG - SOLVED THE ISSUE!!!
THE SOURCE OF THE PROBLEM: The broken electro-valve within the DSG gearbox.
Not mechatronic unit, not the TCU, not solenoid, not TPMS, not electronics.
Since it was replaced to the ORIGINAL NEW ONE the problem disappears.
So, first of all guys find a professional diagnostic computer with the person who knows how to use it (not some cheap & free tester or apps)
PS: There is a possibility that for some issues the TCU or some elements of it could be broken.
But that should be diagnosed first as I described above, and the proper report from such testing should be deliver to you in the first place. Without that it is just guessing.
If someone haven't tested anything and just saying "I know what the issue probably is or could be" ask for a diagnostic report and some prove - error codes & error names.
Unless you have a lot of money to spent or such person will fix that for free. That is too expensive problem to approach like that.
WHAT TO AVOID WHEN TROUBLESHOOTING THIS ISSUE & HOW TO SAVE A LOT OF MONEY:
1. Avoid magical parts which solves the issue - I saw one YouTube video when some dude is trying to sell you a part which if you replace the original gearbox part with two screws under it will solve that issue magically = BULLSHIT & SCAM.
2. Avoid companies like one from UK (commercial on the YouTube channel) which states that they have a magical trick in their great workshop, just send them a computer and they will solve the case = BULLSHIT & SCAM.
How could they know what the issue is without connecting any diagnostics to your car? They can't.
3. Avoid guessing, the "I think, maybe, in my opinion" bull****s which you can see a lot e.g., in the YouTube comments from people who did not diagnose or even see your car at all
4. Avoid magical YouTube solutions from the people who did not present a report with the errors from a professional grade diagnostic computer on that video with the error codes and error codes numbers (those are basics for any diagnostic)
5. Be careful with the official Audi Car Service as many times they just us a standard approach or hide the manufacturer mass failures (like they deny of the 2.0 TFSI 8T3 bad design of pistons & rings which causes 0,5-2L oil consumption per 1000km and states that it is due to the oil separator or that's how it is). In my case Audi official car service stated that it is a broken mechatronic (replacement costs a few thousands of $) while in fact it was a one electro valve which was broken.
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Originally Posted by 175mph
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