Author Topic: ACC  (Read 1194 times)

Offline Don76

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ACC
« on: 21 April 2021, 19:23 »
I took delivery of a new GTD this week. First proper run today from Edinburgh to Newcastle and back.
The ACC was driving me mad and I’d like to know if it’s a setting or a rookie error on my part.

On the dual carriageway, whilst in the outside lane, it would repeatedly slow down as I approached cars on the inside lane. A dab of the throttle would over ride this, but it would happen quite often. Almost as if it expected me to be overtaking in the other lane.

Other times it would behave as I expected and overtake without issue.
I indicated to pass cars, but didn’t make a difference. Sometimes I’d be passing 10-15 cars and it would allow a few, then after say a dozen or so, it would slow me.

One final annoyance (and perhaps linked) it would randomly show the speed limit as 110 (dual carriageway) or 90 (single carriageway) which made me think it was set to km and thus linked to driving on the right instead?

Anyway, like I say - in the space of the 3hr journey it must’ve switched around a dozen times at least.

Any thoughts??

Offline fredgroves

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Re: ACC
« Reply #1 on: 21 April 2021, 20:09 »
Yes, it's thinking its driving on the other side of the road and in kmh.

It could be the settings but I've heard of that being software gremlin caused too.

Check the settings first.
Current: Mk8 GTI DSG, Adelaides, DCC, HUD, HK, Winter Pack, Rear Camera.. Aka "HMS Weasel"

Gone: 2017 Mk7.5 GTD,manual, NavPro
Gone: 2014 Mk7 GTD, manual, NavPro, DCC

Offline Don76

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Re: ACC
« Reply #2 on: 21 April 2021, 20:47 »
Thanks Fred, I’ll check the settings but I suspect software gremlins.
Within a one mile stretch of the A1 it switched between 110 and 70 (on the speed limit sign) a number of times.

The random intermittent nature makes me think it’s a gremlin.

Offline fredgroves

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Re: ACC
« Reply #3 on: 21 April 2021, 20:50 »
The other thing to check is where the GPS thinks the car is. Look on the nav map... Think that's related too.
Current: Mk8 GTI DSG, Adelaides, DCC, HUD, HK, Winter Pack, Rear Camera.. Aka "HMS Weasel"

Gone: 2017 Mk7.5 GTD,manual, NavPro
Gone: 2014 Mk7 GTD, manual, NavPro, DCC

Offline Don76

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Re: ACC
« Reply #4 on: 21 April 2021, 21:29 »
I suspected that, but the Nav knew where I was at all times

Offline fredgroves

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Re: ACC
« Reply #5 on: 21 April 2021, 21:46 »
You know what, I've seen this too.

Or at least I've seen the kmh switch.

I saw 80 indicated on the car and the limit was 50mph. I've just realised that would be 80kmh.

I think I've only noticed it once so far but I've not even got to 1000 miles yet.
Current: Mk8 GTI DSG, Adelaides, DCC, HUD, HK, Winter Pack, Rear Camera.. Aka "HMS Weasel"

Gone: 2017 Mk7.5 GTD,manual, NavPro
Gone: 2014 Mk7 GTD, manual, NavPro, DCC

Offline Don76

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Re: ACC
« Reply #6 on: 22 April 2021, 07:57 »
I phoned vw customer services whilst driving down.
Asked for a tech minded person to see if there was anything obvious in the plethora of settings that i'd missed.

Shouldn't have bothered.  The only advice offered was to take it to a dealer

Offline Don76

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Re: ACC
« Reply #7 on: 10 May 2021, 17:36 »
Quick update on this.
Car was booked into the dealers today and they resolved the issue.

Seems a software update was required.

Here’s the system info:




Offline fredgroves

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Re: ACC
« Reply #8 on: 10 May 2021, 19:42 »
Did they say which software... There are something like twenty plus controllers, all with software and bugs...
Current: Mk8 GTI DSG, Adelaides, DCC, HUD, HK, Winter Pack, Rear Camera.. Aka "HMS Weasel"

Gone: 2017 Mk7.5 GTD,manual, NavPro
Gone: 2014 Mk7 GTD, manual, NavPro, DCC

Offline Don76

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Re: ACC
« Reply #9 on: 11 May 2021, 07:56 »
Did they say which software... There are something like twenty plus controllers, all with software and bugs...

No, they didn’t mention the specifics.
There was however a technical bulletin on his screen from HQ regarding this very fault.
So it was reassuring to know I wasn’t alone.