Haldex failure thread

[TCHUN003]

Seems like there are increasing cases of haldex failures.
If you've had haldex issues, post your:

1. How you discovered you had the issue
2. Mileage
3. Model year
4. Any error codes
5. What was done to fix it, and was it under warranty? I hear they are replacing the units with the ones from 2017's?

[TCHUN003]

1. I recently started launching. 1st time was around 11k miles. Noticed my tires losing traction for longer durations. I recorded it in slow motion and the front wheels rotate 3-4 times for every 1 rear rotation.
2. Currently 13k miles
3. 2016
4. Scanned and no Haldex fault codes
5. Haven't taken it in yet. I have a dsg tune that cannot be flashed back to stock, unlike the ecu tune. I'm hoping they won't blame it on the dsg tune since there are so many failures with stock cars.

[jpy1980]

What DSG Tune are you running

[TCHUN003]

What DSG Tune are you running

Eurodyne ecu and tcu

[Penti]

1) Excessive wheel spin in dry conditions. Confirmed by testing launch, and rear traction on full lock from standstill on gravel.
2) ~16k mi
3) 2015
4) No directly related errors, but also seeing intermittent electronics issues when starting vehicle.
5) Haldex pump replaced under warranty, but issue persists.


Sent from my iPhone using Audizine

[VWVW]

Seems like there are increasing cases of haldex failures.
If you've had haldex issues, post your:

1. How you discovered you had the issue
2. Mileage
3. Model year
4. Any error codes
5. What was done to fix it, and was it under warranty? I hear they are replacing the units with the ones from 2017's?

1. Wheelspin during medium-to-hard launch, even when dry.
2. Discovered at aroung 20k miles.
3. 2015
4. Once plugged into the dealership service computer, an error code for the haldex pump was found.
5. Replaced haldex pump under warranty and the issue was fixed.

[jpy1980]

Eurodyne ecu and tcu

That's odd. I could usually change out my dsg tune to stock. Does yours not show up?

I heard you can request it from ED directly if it didn't. I'd probably do that before taking it in.

[HBird]

Seems like there are increasing cases of haldex failures.
If you've had haldex issues, post your:

1. How you discovered you had the issue
2. Mileage
3. Model year
4. Any error codes
5. What was done to fix it, and was it under warranty? I hear they are replacing the units with the ones from 2017's?

1) Took the car to an AutoX event with paper tags on it. Used LC at the start and experienced prolonged front wheel spin (5-6 seconds). Replicated it multiple times to make sure it wasn't a fluke.
2) I bought my S3 with roughly 16600 miles on it (CPO). I'm assuming this issue was not found during the CPO inspection (but then again other things weren't either but that's another story).
3) 2015 S3 2.0T Premium Plus
4) No error codes present, never ran a VAGCOM scan either but obviously something was up.
5) Covered under warranty by replacing the entire rear differential.

Note: Car is on stock ECU/TCU tune and hasn't had a problem since.

I'll edit this later with a video (for those wondering what the symptoms are) and my invoice from the warranty work.

Edit:

[TCHUN003]

That's odd. I could usually change out my dsg tune to stock. Does yours not show up?

I heard you can request it from ED directly if it didn't. I'd probably do that before taking it in.

Thank you! He got back to me and I'll have access to the stock file. Wondering if I should go through the hassle of swapping the downpipe.

[jpy1980]

Thank you! He got back to me and I'll have access to the stock file. Wondering if I should go through the hassle of swapping the downpipe.

To be super safe you should, but if your service advisor is cool, maybe you don't?

[Penti]

New rear diff' has been ordered from Europe.


Sent from my iPhone using Audizine

[mrandrewau]

anyone know if the replacement haldex is a new redesigned part with a new part #?

[HBird]

anyone know if the replacement haldex is a new redesigned part with a new part #?

A new revision ending in H is the last I heard, and is what got put in my car when it was fixed.

[esss 3]

A new revision ending in H is the last I heard, and is what got put in my car when it was fixed.

My S3 is an April 26,2016 build date and the prefix ending letter on the bottom of the rear diff is K.
I believe H has been superseded by K !!! Read this info on other forums as well.
Good Luck.

[davek2787]

So I just went from a jb1 to a ED 1.5 Tune and recently bought a set of PSS, the launches lately at least to me have been underwhelming. I'm wondering if this could be the haldex as well.

[sansian5016]

My S3 is an April 26,2016 build date and the prefix ending letter on the bottom of the rear diff is K.
I believe H has been superseded by K !!! Read this info on other forums as well.
Good Luck.

So, would a 2017 has the K rear diff as well? I am just curious because I have a 2017 and I am about to tune get the Unitronics Stage 1+ for the ECU and the TCU tune. I certainly do not want issues with the rear diff. But, maybe the later versions are improved and have less issues. Any input from you guys is appreciated.

[mrandrewau]

So, would a 2017 has the K rear diff as well? I am just curious because I have a 2017 and I am about to tune get the Unitronics Stage 1+ for the ECU and the TCU tune. I certainly do not want issues with the rear diff. But, maybe the later versions are improved and have less issues. Any input from you guys is appreciated.

I believe you can just get under the car and take a look at the part number on the diff.

[PsiBlast]

Any photos of where to look exactly? Thanks.

[esss 3]

Any photos of where to look exactly? Thanks.

The part number on my 2016 S3 "0CQ-525-010 K" is located on the bottom of the aluminum differential housing.
If I remember correctly, when you are looking from the back or from the passenger side of the vehicle it is to the left of the Haldex actuator.
It is stamped into the housing clear as day, you will also see VAG AG.
Hope this helps and please post what you guys find.
I was reading last night that the K may be superseded by M, but no proof was provided to support the claim.
Hope this helps.

[PsiBlast]

The part number on my 2016 S3 "0CQ-525-010 K" is located on the bottom of the aluminum differential housing.
If I remember correctly, when you are looking from the back or from the passenger side of the vehicle it is to the left of the Haldex actuator.
It is stamped into the housing clear as day, you will also see VAG AG.
Hope this helps and please post what you guys find.
I was reading last night that the K may be superseded by M, but no proof was provided to support the claim.
Hope this helps.

Thanks, but need a little clarification as I have no clue where the Haldex actuator is or what it looks like. :)

I assume the differential housing is in the center of the rear axle. Yes?

[esss 3]

This is a reference pic from an S3. This is an F version.
Yes it is in the center of the rear axel.
Haldex actuator is cylindrical and about 4/5 inches long and to the left in the above pic.

[TCHUN003]

Fyi, I used my obd11 to "increase traction" and it fixed my issue.... at least for now... This may be a temporary band-aid, but my launches feel roller coaster-like again and it gives me the sensation that my stomach is dropping. A few ppl on fb mentioned that this mod makes it seem like more power is going to the rear. I was skeptical, but my car feels amazing again.

This was discussed on audizine, and basically it's adjusting the XDS. It's supposed to apply brake pressure to certain wheels that are losing traction to decrease understeer, and it ended up resolving my excessive front wheel spin issue on launches. I don't think it's actually sending more power to the rear, but it's reducing my traction loss to the front tires, making the power from my stage 2 more useable.

My 0-60 times were becoming slower than when I was stock since I would spend a second peeling out and getting nowhere on launches. I was consistently measuring 4.6-4.9 sec. After doing this, I measured my 0-60 today at 3.3 seconds using the same exact method.

I went to address 22 awd > adaptations > wiring logic > increase traction

Hopefully this can help someone who isn't experiencing complete failure yet. This might work if you are having early signs of failure like me.

[jpy1980]

Fyi, I used my obd11 to "increase traction" and it fixed my issue.... at least for now... This may be a temporary band-aid, but my launches feel roller coaster-like again and it gives me the sensation that my stomach is dropping. A few ppl on fb mentioned that this mod makes it seem like more power is going to the rear. I was skeptical, but my car feels amazing again.

This was discussed on audizine, and basically it's adjusting the XDS. It's supposed to apply brake pressure to certain wheels that are losing traction to decrease understeer, and it ended up resolving my excessive front wheel spin issue on launches. I don't think it's actually sending more power to the rear, but it's reducing my traction loss to the front tires, making the power from my stage 2 more useable.

My 0-60 times were becoming slower than when I was stock since I would spend a second peeling out and getting nowhere on launches. I was consistently measuring 4.6-4.9 sec. After doing this, I measured my 0-60 today at 3.3 seconds using the same exact method.

I went to address 22 awd > adaptations > wiring logic > increase traction

Hopefully this can help someone who isn't experiencing complete failure yet. This might work if you are having early signs of failure like me.

Hmm it really does sound like a bandaid. Is it wiser to take the car in now while the damage is minimal, or when its completely broken? I have a buddy that works at Audi as a service advisor. Let me ask him.

[TCHUN003]

Hmm it really does sound like a bandaid. Is it wiser to take the car in now while the damage is minimal, or when its completely broken? I have a buddy that works at Audi as a service advisor. Let me ask him.

My car seems to be in the early stages. I have no fault codes and it's not as bad as some of the videos I've seen, so I don't think the dealership will fix it.

[Dc779a]

Hey guys,

I noticed my 2016 prestige was having a bit of wheel spin even on the summer conti tires. Today I decided to try launch control and with esc off, transmission in M, and vehicle in dynamic I held the brake and when mashing the gas it rose to 4K and held steady. As soon as I let off the brake I expected to take off but instead I essentially did a FWD burnout. I am going to try to get a slowmo video somewhere but it seems I have Haldex failure =( going to call the dealer soon...will update as I find out more

[jpy1980]

Hey guys,

I noticed my 2016 prestige was having a bit of wheel spin even on the summer conti tires. Today I decided to try launch control and with esc off, transmission in M, and vehicle in dynamic I held the brake and when mashing the gas it rose to 4K and held steady. As soon as I let off the brake I expected to take off but instead I essentially did a FWD burnout. I am going to try to get a slowmo video somewhere but it seems I have Haldex failure =( going to call the dealer soon...will update as I find out more

Launch control will only work when the car is in S not M.

[Dc779a]

Launch control will only work when the car is in S not M.

Thanks for the info, I'll try this and see what happens!

[TCHUN003]

Launch control will only work when the car is in S not M.

Actually it will work in M, but it needs to be in S initially. So esp off, put it in dynamic, make sure it's in S, move it to M, hold the brake, rev to 4k, let go of the brake

[Dc779a]

Actually it will work in M, but it needs to be in S initially. So esp off, put it in dynamic, make sure it's in S, move it to M, hold the brake, rev to 4k, let go of the brake

Thanks for the correction, I will try this. My assumption is in nearly 70 degree weather with summer tires I should have very little wheel spin, correct?

[jpy1980]

Actually it will work in M, but it needs to be in S initially. So esp off, put it in dynamic, make sure it's in S, move it to M, hold the brake, rev to 4k, let go of the brake

Ah good to know. I wonder if it's faster if you shift yourself or with S. That's why I thought it would only work in S.

[jpy1980]

Thanks for the correction, I will try this. My assumption is in nearly 70 degree weather with summer tires I should have very little wheel spin, correct?

Probably depends on your tire condition as well. Are they new? Balding?

I am running 235/35 MPSS tires all around fairly new and I get a small amount of wheel spin when launching. Those are fairly sticky tires too.

[jpy1980]

Look at the the end of this video to see how much wheel spin they have for LC https://youtu.be/dbw_CBpJv9Q

[Dc779a]

So I tried again with the car in S, both ESC off and in sport mode. Car was at operating temp, held steady at 4K, I have the OEM conti summers with a good amount of tread on the car now. Instead of launching the car essentially does a burnout, 2 tire marks on the ground complete with smoke rolling off the front tires. I have just under 22k on the car and it has dedicated winter tires. Appointment scheduled next Wednesday and going to have them look at the rear suspension for the mag ride clunk TSB as well.

[Surf2602]

Ah good to know. I wonder if it's faster if you shift yourself or with S. That's why I thought it would only work in S.

I'm curious to try this too. I might be the only one but with the jb1 and sport mode it feel like it over boosts or goes into a safe mode cutting power at the top end and at high rpms. My car seems faster leaving it in d, unless I manually shift. S holds gears too long. Launch control is definitely much better off the line in 1st, buts that's it


Sent from my iPhone using Tapatalk

[jpy1980]

So I tried again with the car in S, both ESC off and in sport mode. Car was at operating temp, held steady at 4K, I have the OEM conti summers with a good amount of tread on the car now. Instead of launching the car essentially does a burnout, 2 tire marks on the ground complete with smoke rolling off the front tires. I have just under 22k on the car and it has dedicated winter tires. Appointment scheduled next Wednesday and going to have them look at the rear suspension for the mag ride clunk TSB as well.

Sorry to hear! Hope things work out at the dealership!!

[A20V200]

So the car was "acting weird" so I decided to use my OBD11 and this popped up!! What are people doing when they go back to the dealership after being TCU tuned? Flash ECU and TCU back to stock and put the stock air box back on and hope for the best or what?

No dash lights or traction control lights...just a little squirmy going around some round a bouts and accelerating out of them.

And if the dealer tries to "stick it to me"...you know, because your car isn't stock and is modified and has X and Y....? Anybody have a cost of repairs?

Car has 21,000 miles on it now....this issue happened in the last week.

[davek2787]

As I said above. I just got a set of Michelin pilot super sports and I went from jb1 to eurodyne 1.5 the car feels slower when launching then before.


Sent from my iPhone using Audizine

[TCHUN003]

As I said above. I just got a set of Michelin pilot super sports and I went from jb1 to eurodyne 1.5 the car feels slower when launching then before.


Sent from my iPhone using Audizine

Try doing what I did to see if it helps:
I went to address 22 awd > adaptations > wiring logic > increase traction

[Dc779a]

https://m.youtube.com/watch?v=eaNeUrZp0Ek

Took a short video, keep in mind I have decent tread on oem conti summer tires, what do you guys think, seems the Haldex is not working on my S3?!

[jpy1980]

That seems pretty excessive.