AUDI A5 S LINE 35 TDI - Auto Hold Dis-engaging

[Aliballibee65]

Evening - I've had my A5 S Line for a few months now and so far enjoying the experience. However recently the "Autohold" has started to disengage without me touch the accelerator.

Usual sequence as an example:

• Approach traffic lights
• Stop and green Autohold engages, green A comes on
• As soon as I take my foot off the brake car immediately restarts and begins to crawl forward
• Have to keep my foot on the brake

This doesn't appear to be a setting in, for instance, driver assist but seems to be something that has possibly failed. Its a real pain, especially on hill starts.

Car is due in Edinburgh Audi shortly for a brake fluid change and if its something that needs to be looked at I can add it to the work sheet.

Any thoughts or previous experience of this issue?

Many thanks, Alan

 

 

[Steve Q]

It'll need a diagnostic check to see if any fault codes flag up. It could just be a wheel sensor but but usually/in theory there'd be a hold function disabled or similar warning if the car had picked up a problem. see what Edinburgh Audi says. Keep us posted on how you get on. 

[Aliballibee65]

38 minutes ago, Steve Q said:

It'll need a diagnostic check to see if any fault codes flag up. It could just be a wheel sensor but but usually/in theory there'd be a hold function disabled or similar warning if the car had picked up a problem. see what Edinburgh Audi says. Keep us posted on how you get on. 

Thanks - good to know I can't diagnose it myself. Will let you know after the trip to Edin Audi. Cheers

[Steve Q]

8 hours ago, Aliballibee65 said:

Thanks - good to know I can't diagnose it myself. Will let you know after the trip to Edin Audi. Cheers

Well if you have a code reader it might show fault codes. But clearly an Audi job. 

[Sid2020]

Is the car idling at the correct revs or a little higher then usual, we’ve had a few fords in lately where the throttle pedal positioning sensors were starting to give slightly incorrect readings causing a increase in revs which might be enough to disengage your auto hold, Audi dealer would hopefully find this on a live data check. 
please keep us updated 

[Aliballibee65]

Good evening all - I meant to post a final response to the Auto-hold issue. During its last service Audi did a diagnostic check and couldn't find anything wrong. The technician suggested we take the car of a drive (he came with me) and we tested the auto-hold and it worked! Now I'm not mechanically (or electronically) minded but whether their diagnostic check reset something its been working fine since the car was returned to me. 
So no real "solution" as such but the A5 is now working correctly. Cheers