I know this has been dealt with a lot but my 2019 M240i stop start only works when the car is on eco mode and a/c off.

It recently had a major dealer service and no issues were reported like low battery etc.

Is there anything I'm missing or is this normal procedure?

Thanks

Dave

Hi Dave

Sounds weird couple of questions (1) Was it like that before service ? (2) Did you ask the Dealer to investigate as many Dealers only use the Diagnostics if there is an issue

I thought Auto Start/Stop was either On or Off ? Maybe a conversation with the Dealer to find out just what they did and whether there was a Diagnostic run

Dave

I didn't mention it tbh as thought of a new battery on top of a major service bill wasn't appealing.

I generally just run the car on eco locally but am confused if the stop start works on any other drive setting??

Today it decided not to work at all during a 100 mile round trip.

No warning lights or anything.

I think I can live with it for now tbh, more irritating than anything.

Thanks tho

Do you have any Battery Management messages appear when you start the car?

My start/stop has never really kicked in as Sytner BMW should have really put a new battery on it before they sold it me. Mine only works if I have done a long drive (100+) and it's not too cold, and all the other parameters are met.

It will only work on mine (G21 320d) in Comfort and Eco mode, Sport disengages it.

Even a slight drop on the battery seems to stop it kicking in. When I first got it I drove in Eco mode all the time, and as my battery is "tired" it didn't really charge up enough. I believe it has an “intelligent” alternator so will only pull on it when really required. Eco prioritises exactly that - fuel economy - so will have alternator disengaged as much as possible.

I know on my Golf when the start/stop has turned the engine off, the child can start it up by turning the A/C button on.

Try charging the battery up over the weekend and see if that makes a difference.

I'll be honest I find start/stop a pain in the ##### and usually turn it off. But it is annoying when a feature doesn't work properly.