A6 2.5 TDI Automatic Transmission Problems (Solved)

Hello automatic transmission experts .

Since I don't really know much about automatic transmissions (I hate this old-fashioned automatic transmission and miss the third pedal ), after clearing all the errors, these 3 errors reappear immediately after a test drive:


Address 02: Transmission Label file: RKS\01J-927-156.LBL
Control unit part number: 4B1 910 155 K. Hardware: 01J 927 156 HH.
Component and/or version: V30 01J 2.5l TDI RdW 3261.
Encoding: 0000001
Operating number: WSC 44245 142 54973
VCID: 2759AC8E95BB2920406
3 errors found:

18201 - Input 2 for transmission output speed (G196).
P1793 - 000 - No signal.
Environmental conditions:
Speed: 768 revolutions per minute.
Speed: 672 RPM.
Speed: 50 revolutions per minute.
(no unit): 2.0
Torque: 18.0 Nm
Temperature: 53.0°C
DK Angle: 0.0°
Binary value: 1010 0 0

17106 - Gear output speed sensor (G195)
P0722 - 000 - No signal.
Environmental conditions:

17090 - Step sensor (F125)
P0706 - 000 - Implausible signal.
Environmental conditions:

The connectors to the transmission are in good condition.

Is this a known issue with automatic transmissions, given these error codes? Which part could be defective? The mileage is 204,000 km.

Quote:

The connector connections to the transmission are okay.

Kabelbaum auch OK? Man hört des öfteren von def. STG.

A few details about the vehicle might also be helpful .
You probably know this, given the wide variety of models available.

Oops, the production date is EZ 1/2004. I still need to find out the transmission identification letter.

Hello T3Surfer.

I apparently initially had insufficient permissions in the forum to reply to your post, but after logging out and back in again, it works now .
I had the same problem two weeks ago. Audi would replace the entire transmission for 4700 euros, depending on the workshop.
There's a competent company in Mammendorf: www.rhelectronics.de.
They repair the control unit at a reasonable price and also service the Multitronic, including a warranty. I highly recommend them; their service is excellent!
If you visit Mannendorf in person, the issue can be resolved within 24 hours (advantage: one-stop shop for installation, repair, and troubleshooting). Alternatively, you can have the control unit removed and shipped via FedEx/UPS to RH, and it will be repaired and returned within 2-3 days.

Best regards from Switzerland.

@smalution Thanks for the tip!

AutoRepairGuy: Finally, I have the transmission code: GJT.
The engine is a BDG.

So, the STG is located in the transmission.

All the defective sensors are part of the control unit, so it appears to be faulty.

AutoSchrauBär: Thank you very much .
Hm, can you remove the engine control unit without having to completely remove the transmission?

The engine control unit (ECU) is located at the rear end, under the cover, and is relatively easy to install and remove.

If you're going to work on that, make sure to read out and save the codes beforehand.

Thank you very much .

So, it turns out the AT-ST (Automatic Transmission Shift Torque) sensor in the gearbox was the problem!
Now it's working again, switching on correctly and smoothly as it should.

for feedback!

Here's how it should be done .