F90 / G30 Adaptive Cruise Stop and Go Behaviour

[Palmball]

Posting this in here to start with, although I might get a better response from the general BMW section as my question is not specific to the M5. Must admit, this is very much a first world issue

So, for anyone who has BMW’s latest adaptive cruise, do you find that sometimes the stop and go feature (i.e. where it can drive itself in traffic) works when it feels like it?

Sometimes the car will accelerate itself even after being stopped for a reasonably long period. Other times it needs a prod of the accelerator (or hitting the resume button) to move off, even after just a couple of seconds.

It’s the inconsistency and seeming lack of reason for the changing behaviour which perplexes me.

Edited by Palmball on Monday 8th July 02:05

[HoHoHo]

Not much help but I have had this option in my F15 50d and F90 M5 and they both work(ed) perfectly.

Does it need recalibration by BMW?

[JMBMWM5]

Palmball said:

Posting this in here to start with, although I might get a better response from the general BMW section as my question is not specific to the M5. Must admit, this is very much a first world issue

So, for anyone who has BMW’s latest adaptive cruise, do you find that sometimes the stop and go feature (i.e. where it can drive itself in traffic) works when it feels like it?

Sometimes the car will accelerate itself even after being stopped for a reasonably long period. Other times it needs a prod of the accelerator (or hitting the resume button) to move off, even after just a couple of seconds.

It’s the inconsistency and seeming lack of reason for the changing behaviour which perplexes me.

Edited by Palmball on Monday 8th July 02:05

My adaptive works well on the F90 M5 CP, coupled with Lane assist is great in traffic where I use it.

[Palmball]

Hmmm....thanks chaps.

But either something is lost in translation here and I've not described the symptoms very well or I'm just very unlucky / dumb (delete as appropriate ) but I've just test driven a new Porsche 992 and it behaves in exactly the same way. Stop and Go works, but not all the time.

[HoHoHo]

Ah, if I understand you now and in which case I think you’ll find stop and go has a time limit of around 15 seconds before it defaults to ‘wake me up’ however you wish to do that.

I normally hit the left hand rotary button to wake the system up

[Palmball]

HoHoHo said:

Ah, if I understand you now and in which case I think you’ll find stop and go has a time limit of around 15 seconds before it defaults to ‘wake me up’ however you wish to do that.

I normally hit the left hand rotary button to wake the system up

Yes that's what I thought at first, and that would make sense.

But sometimes I can be sat for a longer time (call it 30-60 seconds) and it still works by pulling away without any intervention. And it will work consistently well for, say, 10 minutes. Then at some point it'll just stop 'going' by itself and instead the dash will show a picture of the car moving off (i.e. it's telling me to move off myself). And once it has decided to stop 'going' by itself, it won't go by itself again on that journey even if I've only stopped for anything above a couple of seconds.

[HoHoHo]

Palmball said:

HoHoHo said:

Ah, if I understand you now and in which case I think you’ll find stop and go has a time limit of around 15 seconds before it defaults to ‘wake me up’ however you wish to do that.

I normally hit the left hand rotary button to wake the system up

Yes that's what I thought at first, and that would make sense.

But sometimes I can be sat for a longer time (call it 30-60 seconds) and it still works by pulling away without any intervention. And it will work consistently well for, say, 10 minutes. Then at some point it'll just stop 'going' by itself and instead the dash will show a picture of the car moving off (i.e. it's telling me to move off myself). And once it has decided to stop 'going' by itself, it won't go by itself again on that journey even if I've only stopped for anything above a couple of seconds.

Nope, mine doesn’t do that.

After whatever default time it is the system is asleep and requires input from the driver to get going

[Andy M]

If find the stop/start erratic too - the engine will switch itself off even before the car has come to a complete stop.

[M5 London]

Andy M said:

If find the stop/start erratic too - the engine will switch itself off even before the car has come to a complete stop.

I think this is a fault with the Crankshaft Position Sensor. I can remember reading a few owners have this looked into and that part replaced....IIRC !