Question ref the autohold on a B8.5 S4

[t955daytona]

Hi all,
We have a 2014 S4 avant which has the autohold option. When activated on coming to a standstill the parking light goes green as expected and the stop/start activates. If you then come off the brake the engine restarts automatically even though you don't want or need it to. Is this usual with the DSG? The reason i ask is I also have a manual Golf R with the system and this hold the car and doesn't start the engine until you need it to. I.e when you select a gear and go to move off.
Regards Craig

[Adrian E]

Audi A7 loaner auto I had for a day behaved the same as your S4

[t955daytona]

Thanks,
Seems bloody useless then as ideally you want it to hold the car so you are not on the brakes but ideally with the engine off until you need to move off, which is exactly how the Golf is. I'm sure there is some valid reasoning behind it but it seems like a waste of time.

[Adrian E]

Probably just because the 2 systems aren't configured to work together particularly well, given hill hold is still optional?

[t955daytona]

Thinking about it for an engineering perspective the manual restarts on pressing the clutch pedal. On an auto (DSG) if the engine was off when auto hold was engaged the only switching process available to restart the engine would be on pressing the throttle. The engine probably cannot start quick enough and so if someone stamped on the throttle the car would probably cause damaged to the transmission or lunge forward.

[mikes2w]

You would have to move the DSG to neutral.

By leaving it in drive, it will auto-start the engine

[t955daytona]

Ah,
That makes sense. Will try it when I get chance, thanks.