4x4 transmission problem, making a creaking noise

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Jey

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Hi,

We have a Caravelle T6 from october 2016, 375 000 Km. 2.0 TDI 4motion + differential lock. We use it 7 months / 35 000 Km per year on ice and snow (with specific tires).
That last oil change on the back of the transmission was made on June 2024 (+/- 50 000 Km).

Since 3 months, I hear a bad noise and I feel "jolts" (is it the right word?), coming from the back, pretty sure.

This is happening after I moved on a parking, doing reverse and turning.
Then, I go forward and immediately when I gently touch the brake pedal (just a very little), creaking noise is coming and jolts.

We checked brakes : everything is ok, power braking and balance between brakes.

I'm sure it's coming from the transmission.

I was at a VW garage 2 days ago, the mechanic saw this 1 time : he spoke to change oil, and clean the oil filter behind the oil pump (at the back, on the rear part of the transmission).
I asked to change the pump during the same time (we will do it in October when I will come back in my country).

If it's not fixing the problem, they said it's maybe the "clutch" in the Haldex : but it's forbidden to open it and change "clutch", so I have to buy a new haldex : 7200€ (so happy...).


And, yesterday, I thought about one thing, that I have read 15 years ago when I had a Audi S4 B5 (with Haldex) : maybe it's coming from my tires. but I checked, there is +/- 1mm less rubber than the back.
So not sure it's the origin of the problem (and I never had this problem in the past with more difference with older tires).
I will ask to a garage to exchange tires between back and front.


Please, do you have any idea or experience about this problem ?

thank you.
 
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Hi,

We have a Caravelle T6 from october 2016, 375 000 Km. 2.0 TDI 4motion + differential lock. We use it 7 months / 35 000 Km per year on ice and snow (with specific tires).
That last oil change on the back of the transmission was made on June 2024 (+/- 50 000 Km).

Since 3 months, I hear a bad noise and I feel "jolts" (is it the right word?), coming from the back, pretty sure.

This is happening after I moved on a parking, doing reverse and turning.
Then, I go forward and immediately when I gently touch the brake pedal (just a very little), creaking noise is coming and jolts.

We checked brakes : everything is ok, power braking and balance between brakes.

I'm sure it's coming from the transmission.

I was at a VW garage 2 days ago, the mechanic saw this 1 time : he spoke to change oil, and clean the oil filter behind the oil pump (at the back, on the rear part of the transmission).
I asked to change the pump during the same time (we will do it in October when I will come back in my country).

If it's not fixing the problem, they said it's maybe the "clutch" in the Haldex : but it's forbidden to open it and change "clutch", so I have to buy a new haldex : 7200€ (so happy...).


And, yesterday, I thought about one thing, that I have read 15 years ago when I had a Audi S4 B5 (with Haldex) : maybe it's coming from my tires. but I checked, there is +/- 1mm less rubber than the back.
So not sure it's the origin of the problem (and I never had this problem in the past with more difference with older tires).
I will ask to a garage to exchange tires between back and front.


Please, do you have any idea or experience about this problem ?

thank you.

Welcome to the Forum.
You sound like an experienced driver with knowledge of the Haldex system, but is it possible that the differential lock has engaged and does not always disengage when you press the button?
A constantly engaged differential lock can cause tension within the transmission when turning, especially on a high traction surface, which might cause creaking type noises.
 
No it's not like when I engage the lock and go back on road (and no any light are ON on the dahsboard).
When I used the lock, we can feel/hear something when turning.

My problem is when I drive straight (leaving a parking for example), forward and when I gently touch the brake pedal, then boom...
 
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