Shifting problems with 6-speed DSG

Hello everyone,
I've been experiencing the following problem with my Skoda Octavia (year 2007, 2.0 TDI, 140 hp) for the past week:

The transmission doesn't always shift automatically in the lower RPM range (2000-2500 RPM). Specifically, when accelerating gently, it shifts from 1st to 2nd at 2200 RPM, from 2nd to 3rd at 2100 RPM, and nothing happens when trying to shift from 3rd to 4th. It only shifts at 3500 RPM. After driving 5 km, everything is fine, but after another 5 km, it has problems shifting from 2nd to 3rd (following the same pattern).

Betroffen sind alle Gänge außer vom 1. zum 2. Gabbreviations
All the gears can be shifted smoothly and easily with manual operation.
When you accelerate quickly, it shifts through all the gears cleanly at 3500 RPM.
The transmission's fault memory is empty.
It's strange that when driving uphill in manual mode and with a lot of throttle, the gear changes seem to occur around 2300 RPM as if something is spinning wildly inside the engine compartment.

Over the past two years, there have been three instances where, when shifting from second to third gear, the gear indicator on the display disappeared, and the vehicle stopped responding to acceleration. Restarting the car resolved the issue each time.

Is the clutch now defective? Nothing is slipping.
Low oil level in the transmission? The last oil change was 4000 km ago, and less oil was added than usual.
Is there a sensor somewhere in the transmission mechatronics?
I am very grateful for any help.

Especially given the recent history (oil change at 4,000 km), it's crucial to first check the oil level in the transmission. The correct oil level is essential for automatic transmissions!

TDI-GTI-4-Motion wrote:

Especially considering the mileage (oil change at 4,000 km), it's crucial to first check the oil level of the transmission. A correct oil level is essential for automatic transmissions!

Furthermore, not every apprentice is clear on how to properly perform the oil change. Specific temperatures must be maintained, the engine needs to be running, and the transmission must be shifted through all gears. If the oil is added with the engine off, there will be significantly too little oil in the system.

Greetings.
Sure.

Here is the translation of the text from German to English:

"Guste" means "gust" in English. It refers to a sudden and strong gust of wind.

You are right. The oil level was checked at another workshop today, and it was found to be about 0.8 liters too low. The level has now been corrected. Now the question is: Is the transmission damaged? If so, what exactly could be wrong?

"So, the shifting behavior is still strange, and I've noticed that it only affects gear changes from 3rd gear onwards. What's also odd is this: when I manually shift into 6th gear, if I release the accelerator as soon as I switch to 'D', it shifts down to 5th gear on a straight line, and if I give it a little gas, it shifts down to 4th gear, where the engine speed is around 2800 RPM."
The same behavior was observed in the 5th gear as well.

Was the car rented out? The transmission likely has different driving modes and adapts to the user. If a wild boar used the car in between, that could explain it.

Let's also check if the DPF regeneration is active. Mine also behaves strangely sometimes (but it should return to normal after a longer ride at operating temperature).

Greetings.
Sure.

Here is the translation of the text from German to English:

"Guste" means "gust" in English. It refers to a sudden and strong gust of wind.

Hello everyone,

Was the problem finally resolved?

We are experiencing the exact same problem with our 2.0 TDI 6-speed DSG Touran, and it only happens when the outside temperature is warm.

Was it really the oil level (too little oil) that needed to be topped up while the engine was running, and did that permanently solve the problem?

Best regards,

Checking the oil level is often the simplest first step in troubleshooting issues with an automatic transmission, besides reading the error codes. When was your last fluid change, and how many kilometers has the transmission covered?

We've finally found a solution that may seem somewhat unconventional.

During the error reading process, the diagnostic system repeatedly indicated a problem with glow plug number 3 on cylinder 3.

All four glow plugs were replaced during this year's service.
Error codes cleared.

The DSG is working just like it did on the first day...

I can only imagine that the engine control unit, due to stored errors, might have transmitted implausible torque values or something similar, and this only occurred at outside temperatures above 8 degrees Celsius? Consequently, the transmission then refused to shift.

Jedenfalls ist jetzt alles gut Touran hat jetzt knapp über 210.000km runter und Getriebe schaltet wie am 1. Hey...


Greetings to everyone!

eg_xxx wrote:

We have finally found a solution that may seem somewhat unconventional. During the diagnostic scan, the error code repeatedly indicated a problem with glow plug number 3 on cylinder 3. All four glow plugs were replaced during this year's service. Error codes cleared. The DSG is working just like it did on the first day... I can only imagine that the engine control unit, due to stored errors, might have transmitted implausible torque values or something similar, and this only occurred at outside temperatures above 8 degrees Celsius? Consequently, the transmission then refused to shift. Jedenfalls ist jetzt alles gut Touran hat jetzt knapp über 210.000km runter und Getriebe schaltet wie am 1. Hey... Grüße gehen raus!

Which vehicle? Or one from the beginning of the topic? I could potentially imagine using a glow plug as a combustion pressure sensor (only for current TDI models), but those vehicles are far too old for that.
It seems plausible to me that the problem lies with the engine wiring harnesses (e.g., to the mass airflow sensor), which were moved during the glow plug replacement procedure. Therefore, I wouldn't be surprised if the error reappears soon.

Best regards, Rainer.

Hi.

VW Touran, 140 horsepower, manufactured in 2006, 6-speed DSG transmission.

The problem hasn't occurred again yet.

Best regards,