T6.1 ACC issues with new wheels

[Bga86]

Hi Guys/gals


I wonder if someone has an answer to an issue I’m having, I realise this has been mentioned before and there’s a lot of people who’ve had the issue but no one seems to have posted a confirmed fix for it.

I’ve recently replaced my T6 with a T6.1 T30, it has ACC. I’ve started adding a few bits to it and today removed the standard 16” wheels and fitted a new set of 20” wheels with 275/40/20 tyres on. After driving about a mile down the road I got a “ACC deactivated, sensor impaired fault” on the dash.

Having done some reading it seems this is a relatively common issue, some people are saying it’s down to the speedo not reading accurately and the tyres/wheels need to be smaller some are saying it’s down to the ACC sensor now sitting higher.

I’ve also read that the speedo can be adjusted using vcds, now I have vcds (novice user) but am reluctant to start messing with this as I’ve also read it cannot be put back down on a T6.1 should you change back to smaller wheels.



I appreciate this is a long post but any advice or help would be most welcome please

 

[Drive Wayne]

My 6.1 started doing that when I put a new gloss grille on it. Nasty yellow warning triangle comes on for a few minutes every week on average. Sensor impaired fault, I haven't got ACC. Have you fitted a new grille?

 

[Bga86]

My 6.1 started doing that when I put a new gloss grille on it. Nasty yellow warning triangle comes on for a few minutes every week on average. Sensor impaired fault, I haven't got ACC. Have you fitted a new grille?

Yes I have, the grille was fitted last week and I’ve used it plenty without any faults until the wheels were fitted though?

 

[Drive Wayne]

Yes I have, the grille was fitted last week and I’ve used it plenty without any faults until the wheels were fitted though?

I had 20's on long before the new grille. It wasn't an off the shelf grille, it was a body shop sprayed one. That's the only current warning I'm getting, it's relatively fleeting and it goes away quickly enough, but the grille looks good, I'll live with it!

 

[Bga86]

So I've just put the info into will they fit and it’s showing the speedo will now be under reading quite a bit

 

[Drive Wayne]

70mph on my speedo on my van equates to 74mph on waze.
I'm hoping to collar a wonderful person who uses VCDS at one of the forum gatherings to put mine right, eventually! No rush....! Keeps the miles down a bit!

 

[Dav-Tec]

My 6.1 started doing that when I put a new gloss grille on it. Nasty yellow warning triangle comes on for a few minutes every week on average. Sensor impaired fault, I haven't got ACC. Have you fitted a new grille?

Wayne take the grill off and rub the square area down with scotchbrite to remove the paint. Message or call me if your not sure mate

 

[Dav-Tec]

Also I'm amazed your t6.1 hasn't got ACC

 

[Drive Wayne]

Also I'm amazed your t6.1 hasn't got ACC

It's a Startline, poverty spec! Quote me for ACC Chris! I certainly would like it...