Electronic Parking Brake and ACC fault

Faults and Technical chat for the Volkswagen T-Roc
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brid
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Re: Electronic Parking Brake and ACC fault

Post by brid » Thu Aug 13, 2020 9:14 am

Clubchamp98 wrote:
Wed Aug 12, 2020 2:33 pm

Mine does exactly that.
Stops on its own, when car in front pulls away mine starts up and follows.
If yours dosnt there is something wrong.
Having said that you need a lot of faith in the system ,and any touch on the brake pedal disengages the ACC.

In normal driving ( not ACC ) does your engine start up on its own in start/ stop mode When the car in front pulls away .?
It should with no input from the driver.
If the "auto engine stop start" is disabled or the engine remains running at the time of self stopping does the car still move off unassisted?
Normally I run with auto stop start disabled when in town centre but when I keep stop/start active I have not really taken much notice, perhaps it does but always thought that this was due to either a slight turn of the wheel or the removal of the foot from the brake pedal. (DSG)
Never associated this with the car in front moving off. Must pay more attention.
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Collected 12-06 2019

Impala
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Re: Electronic Parking Brake and ACC fault

Post by Impala » Thu Aug 13, 2020 7:30 pm

brid wrote:
Thu Aug 13, 2020 9:14 am
Clubchamp98 wrote:
Wed Aug 12, 2020 2:33 pm

Mine does exactly that.
Stops on its own, when car in front pulls away mine starts up and follows.
If yours dosnt there is something wrong.
Having said that you need a lot of faith in the system ,and any touch on the brake pedal disengages the ACC.

In normal driving ( not ACC ) does your engine start up on its own in start/ stop mode When the car in front pulls away .?
It should with no input from the driver.
If the "auto engine stop start" is disabled or the engine remains running at the time of self stopping does the car still move off unassisted?
Normally I run with auto stop start disabled when in town centre but when I keep stop/start active I have not really taken much notice, perhaps it does but always thought that this was due to either a slight turn of the wheel or the removal of the foot from the brake pedal. (DSG)
Never associated this with the car in front moving off. Must pay more attention.
Interesting reading all the different experiences with ACC and Start/Stop.

In my view, both these systems work best with a DSG and I suppose that is what they are really designed for and it is perhaps to VW credit that they have been made to work to a limited degree with a manual gearbox. This really hightlights the lack of detail and explanation in the Owner's Manual, as the differences and limitations with a manual box are not discribed.

My car is a DSG and I very seldom ever have to turn anything on or off - I drive with Auto Hold and Stop/Start permanently ON. I occasionally cancel Auto-Hold when I pull out from a T-Junction on a hill, as it avoids front wheel spin that can happen when reving hard to release Auto Hold while turning a 90-degree corner.

When I use ACC, I never need to touch anything unless I want more/personal control, such as pressing Cancel and cruising in 'Reduce speed now' zones rather than pressing the brake pedal. The car is quite happy running on ACC at reducing speeds to a complete halt behind another car. NOTE: the stationary car must have been in range of the ACC before it came to a standstill, and you cannot automatically slow and stop behind a car which has been sitting stationary before you arrived.

As Twist mentioned, the ACC will auto resume operates for a short while after stopping. Resuming without the auto feature can best be achieved on a DSG by either light pressure on the throttle or by slight turning of the steering wheel. This is also a way of restarting the engine when Stop/Start has activated, but restart is also automatic if a stationary car in front moves off.

If you apply the foot brake at any point and for even the briefest of time, then ACC will be cancelled, but the previously set speed will still be stored and can be re-activated by pressing Res(ume) on the steering wheel.
1.5 TSI DSG R-Line MY19 Indium Grey, rear view camera, park assist.
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Built w/c 25/03/19 :(
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Deleted User 925

Re: Electronic Parking Brake and ACC fault

Post by Deleted User 925 » Thu Aug 13, 2020 8:17 pm

A Manual gearbox isn't any use in the scenarios mentioned in all the comments.
Not much use when you have to change down the gears yourself, otherwise it can work but not worth the effort.
Definitely takes a lot of faith sitting back and trusting the technology :P

Clubchamp98
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Re: Electronic Parking Brake and ACC fault

Post by Clubchamp98 » Thu Aug 13, 2020 8:39 pm

brid wrote:
Thu Aug 13, 2020 9:14 am
Clubchamp98 wrote:
Wed Aug 12, 2020 2:33 pm

Mine does exactly that.
Stops on its own, when car in front pulls away mine starts up and follows.
If yours dosnt there is something wrong.
Having said that you need a lot of faith in the system ,and any touch on the brake pedal disengages the ACC.

In normal driving ( not ACC ) does your engine start up on its own in start/ stop mode When the car in front pulls away .?
It should with no input from the driver.
If the "auto engine stop start" is disabled or the engine remains running at the time of self stopping does the car still move off unassisted?
Normally I run with auto stop start disabled when in town centre but when I keep stop/start active I have not really taken much notice, perhaps it does but always thought that this was due to either a slight turn of the wheel or the removal of the foot from the brake pedal. (DSG)
Never associated this with the car in front moving off. Must pay more attention.
It should do all features of ACC are active , the start stop system is separate from ACC.
Once the engine has stopped in start/ stop And auto hold mode taking your foot off the brakes won’t do anything in a DSG.
Turning the wheel or slight pressure on accelerator will start the engine.
So will the car in front pulling away.

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brid
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Re: Electronic Parking Brake and ACC fault

Post by brid » Fri Aug 14, 2020 9:01 am

Clubchamp98 wrote:
Thu Aug 13, 2020 8:39 pm
It should do all features of ACC are active , the start stop system is separate from ACC.
Once the engine has stopped in start/ stop And auto hold mode taking your foot off the brakes won’t do anything in a DSG.
Turning the wheel or slight pressure on accelerator will start the engine.
So will the car in front pulling away.
Now maybe we come to the crunch. "All features active" Just what are all the features.
Never use the auto hold feature in general as it is too restrictive at busy roundabouts etc:
Is this part of the features and must it be active to facilitate this "auto move off" ?
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Collected 12-06 2019

Clubchamp98
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Re: Electronic Parking Brake and ACC fault

Post by Clubchamp98 » Sat Aug 15, 2020 7:49 am

brid wrote:
Fri Aug 14, 2020 9:01 am
Clubchamp98 wrote:
Thu Aug 13, 2020 8:39 pm
It should do all features of ACC are active , the start stop system is separate from ACC.
Once the engine has stopped in start/ stop And auto hold mode taking your foot off the brakes won’t do anything in a DSG.
Turning the wheel or slight pressure on accelerator will start the engine.
So will the car in front pulling away.
Now maybe we come to the crunch. "All features active" Just what are all the features.
Never use the auto hold feature in general as it is too restrictive at busy roundabouts etc:
Is this part of the features and must it be active to facilitate this "auto move off" ?
I think for the ACC to work properly the auto hold probably needs to be on.
It’s the start stop I don’t like at roundabouts it cuts the engine before you come to a halt and won’t let you just creep to the junction lines.
But ACC is no good at roundabouts as if it loses the car in front it will accelerate again.
You need a lot of faith in ACC and I only use it on the motorways now.

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mvk3
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Re: Electronic Parking Brake and ACC fault

Post by mvk3 » Sat Aug 15, 2020 8:03 am

Clubchamp98 wrote:
Sat Aug 15, 2020 7:49 am
brid wrote:
Fri Aug 14, 2020 9:01 am
Clubchamp98 wrote:
Thu Aug 13, 2020 8:39 pm
It should do all features of ACC are active , the start stop system is separate from ACC.
Once the engine has stopped in start/ stop And auto hold mode taking your foot off the brakes won’t do anything in a DSG.
Turning the wheel or slight pressure on the accelerator will start the engine.
So will work when the car in front pulls away?
Now maybe we come to the crunch. "All features active" Just what are all the features.
Never use the auto-hold feature in general as it is too restrictive at busy roundabouts etc:
Is this part of the features and must it be active to facilitate this "auto move off"?
I think for the ACC to work properly the auto-hold probably needs to be on.
It’s the start-stop I don’t like at roundabouts it cuts the engine before you come to a halt and won’t let you just creep to the junction lines.
But ACC is no good at roundabouts as if it loses the car in front it will accelerate again.
You need a lot of faith in ACC and I only use it on the motorways now.
I have never tried the auto-hold in the off position, on purpose. It was once off as something must have knocked it at some point in the day, and what a fright I got when it was not on and ready to hold on a slight incline, I bet the bloke behind also thought the same. No point in having it if you don't use it. I know it's a personal choice but it would confuse the s**t out of me to it not be there.

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mvk3
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Re: Electronic Parking Brake and ACC fault

Post by mvk3 » Sun Aug 16, 2020 8:09 am

The stupid start-stop very nearly had me involved in an accident, just as I was going to move off, having come to a very slow movement at a junction the engine system thought it was time to stop. And the car just stopped dead, the bloke behind thought it was time to go just like me. Fortunately, he was quick enough to break and just avoided bumping me at the rear by a couple of mm. I have un-plugged the wire at the battery to avoid the start-stop from working at all. I now just get a warning on the dash that the start-stop is not working, thank God. To me, these things should be banned, as they are dangerous. It would help if the switch would stay the way you last put it but the stupid thing resets it's self every time you switch off the engine.

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brid
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Re: Electronic Parking Brake and ACC fault

Post by brid » Sun Aug 16, 2020 9:13 am

mvk3 wrote:
Sun Aug 16, 2020 8:09 am
The stupid start-stop very nearly had me involved in an accident, just as I was going to move off, having come to a very slow movement at a junction the engine system thought it was time to stop. And the car just stopped dead, the bloke behind thought it was time to go just like me. Fortunately, he was quick enough to break and just avoided bumping me at the rear by a couple of mm. I have un-plugged the wire at the battery to avoid the start-stop from working at all. I now just get a warning on the dash that the start-stop is not working, thank God. To me, these things should be banned, as they are dangerous. It would help if the switch would stay the way you last put it but the stupid thing resets it's self every time you switch off the engine.
Agreed, this cruising to a halt without engine also bugs me, and being unable to anticipate what it will do and when it will do it is annoying.
I have a general routine, press button to start / hit the disable stop/start button, into gear, job done.
The way auto hold operates (with a DSG) seems a small step too far, in traffic I really want to be able to creep forward rather than make a definite stop, touch throttle then perhaps brake again and have to repeat this constantly so this function is normally "off" rolling back on an incline is not a serious DSG problem unless its excessive then wheel spin is the main problem anyway :D
My other car ( also DSG) has an auto hold which can be "requested" simply by, when stopped, applying a second pressure push of the foot brake pedal. Never disabled, never over active, just there when you want/need it.
Just like the VW, still have to push a button to disable the stop/start tho. I suppose this is a efficiency ploy.
General driving environment will always play a major part in choices as not all will drive in heavy stop go traffic.
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Clubchamp98
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Re: Electronic Parking Brake and ACC fault

Post by Clubchamp98 » Sun Aug 16, 2020 7:26 pm

I asked the tech at service to alter my stop start and he said “ he couldn’t”
The driver has to have control of the car at all times.
I am afraid this car dosnt let me do that.
I will be selling it soon and going back to a car I have control over.
My golf was driver controlled like your description and so much easier to drive.
It’s a pity as this could be so much better. But some of the systems are really crap.

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