2015 Jetta TDI DSG - Hill-Hold works only intermittently - Volkswagen Jetta Forum
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Old 05-17-2019, 01:05 AM   #1
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Default 2015 Jetta TDI DSG - Hill-Hold works only intermittently

2015 Jetta TDI DSG Highline (India)

This car is hill-hold assist which I believe is supposed to hold the car on an upward incline for about 3 seconds.

The issue is, it works intermittently. Sometimes it works perfectly, sometimes the car rolls back a little,

The frustrating point in my case is that it never seems to misbehave when trying to replicate the issue with VW service people on board - it occurs only when they’re not there in the car.

Well, actually it did happen a couple of times with them on board, but they refuse to accept that they observed it.

They also tell me that “it only rolled back very slightly, and that’s how it’s supposed to behave”; and “hill-hold only works when you shift from neutral to Drive, and not when coming to a complete stop without shifting to Neutral”.

To their credit, the VW service centre did try speaking with VW India’s senior tech folks at the factory; but the tech folks say that unless there is a fault code there is nothing they can do. And there is no fault code!

I did try to shoot a video of when this happens, but the video only shows a slight roll-back and they’re unwilling to accept that the video shows any rollback.

Any ideas on what else I could do to try and get them to do some trouble-shooting without fault codes?

The car is completely stock, no mods of any kind anywhere other than using a spare fuse to connect a dash cam.

Thank you and cheers
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Old 05-17-2019, 03:00 AM   #2
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I had a DSG, it would hold for a few seconds, then K1 engages to start
moving the car. You should also notice a hard brake pedal if you pump
it while on a hill. Also, hill hold is done by the ABS pump applying brake
while on a hill. When you let off the brake, hill or not, the car assumes
you want to go forward. With a MANUAL trans, you need that few
seconds to engage your clutch. It really isn't all that advantageous with
an Automatic, because you're going from brake to fuel, not brake to clutch
to fuel... If the car is on a 5 degree or greater incline and in first or reverse,
then the car will hold the brake pressure you applied for two seconds after you
let your foot off the brake or until there is suitable power to go in the direction
you want to go.

If you got is used, the previous owner may have disabled it. You need VCDS
to activate it. I think it's almost useless in an automatic.

The DSG is basically a manual shifted automatically. When you come to a stop,
the clutch (K1) is not disengaged. Even if you were on a flat surface, you can
notice the slight bump into gear when you let off the brake.

I get NO roll back, because I don't take 3 seconds to go to the fuel pedal from
the brake pedal. I am not a 70 year old with a bum leg either... Brake, to fuel pedal
is almost instantaneous, so I don't worry.
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Old 05-17-2019, 03:29 AM   #3
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Quote:
Originally Posted by PowerslavePA View Post
I had a DSG, it would hold for a few seconds, then K1 engages to start
moving the car. You should also notice a hard brake pedal if you pump
it while on a hill. Also, hill hold is done by the ABS pump applying brake
while on a hill. When you let off the brake, hill or not, the car assumes
you want to go forward. With a MANUAL trans, you need that few
seconds to engage your clutch. It really isn't all that advantageous with
an Automatic, because you're going from brake to fuel, not brake to clutch
to fuel... If the car is on a 5 degree or greater incline and in first or reverse,
then the car will hold the brake pressure you applied for two seconds after you
let your foot off the brake or until there is suitable power to go in the direction
you want to go.

If you got is used, the previous owner may have disabled it. You need VCDS
to activate it. I think it's almost useless in an automatic.

The DSG is basically a manual shifted automatically. When you come to a stop,
the clutch (K1) is not disengaged. Even if you were on a flat surface, you can
notice the slight bump into gear when you let off the brake.

I get NO roll back, because I don't take 3 seconds to go to the fuel pedal from
the brake pedal. I am not a 70 year old with a bum leg either... Brake, to fuel pedal
is almost instantaneous, so I don't worry.
Thank you for responding promptly.

I bought the car new, and no, I did not disable hill-hold.

Yes, I am indeed aware as to what DSG is and how it works; as I am with how hill-hold is supposed to work

My issue is that sometimes, only sometimes, hill-hold does not work on an incline, and the car does roll back when I lift my foot off the brake and move it to the accelerator.

Yes, I am aware that hill-hold is only effective for 3 seconds, and no, nor do I take three seconds to move my foot from one pedal to another. It is almost instantaneous.

I have had this car since new (2015) and have driven 90,000 kms in it; and am quite used to how the DSG usually behaves.

Thank you once again and cheers
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Old 05-18-2019, 07:28 PM   #4
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None of my VW Automatics ever rolled backwards, and didn't need
hill hold. There was no WAY I was taking so long from brake to fuel for it
to roll backwards anyway. You make it read like you're back drifting
feet instead of a few inches... Would not bother me in the least, even
with a standard...
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Old 05-19-2019, 01:43 AM   #5
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Thank you

I did not mean to make it sound like it rolled back a lot, apologies for not being clear. That said, I have not really checked to see how far it does roll back - my foot is on the accelerator and moving the car forward before it can roll back any significant distance.

The point is that it is not supposed to roll back at all, not even an inch; and sometimes it works properly - does not roll back even an inch.

The reason I am concerned at all is because I am worried that this might just be the beginning of a more expensive problem - this might just be the starting symptoms. I would prefer to be able to identify the issue now while the car is still under warranty and have it fixed free of charge rather than having to pay through my nose later out of warranty. That's all.

Thank you once again and cheers
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Old 05-19-2019, 03:15 AM   #6
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It probably depends on how steep the hill is.


If your brakes work, then it's no failure; the ABS PUMP is responsible for
hill-hold.
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Old 05-19-2019, 03:20 AM   #7
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I have had it happen on slopes of varying degrees - very mild to relatively steep. I have not been able to identify a pattern yet.

Brakes seem to work fine, though the rear pads are due for replacement in about 5000 kms.

Cheers
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Old 05-20-2019, 05:04 AM   #8
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You will run through 3 sets of rears before ONE set of fronts. VWs are rear
brake biased. Don't know if you have ever noticed or not, but VWs don't
nose dive when you brake. That's rear brake bias... My TDI, I went, wow, like
172,000 miles before replacing the front pads. Replaced the rear 3 times within
that span... 243,000 miles total, and only did the front pads and rotors once...
Loved my TDI, and want another one, but, can't find a deal I can live with...
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Old 05-20-2019, 05:06 AM   #9
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Really? That's odd, because I am on my second set of fronts and the rears are still the original ones the car came with.

Cheers
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Old 05-20-2019, 04:17 PM   #10
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I had a '15 TSI, replaced the rear pads, fronts were still good, 175,000 miles.


I have a '12 SE, I will be replacing the rears again, soon, fronts are good, and I
upgraded to the 312mm rotors (need caliper brackets).
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