Strange issue (Manual Transmission)

[pokrovsky]

I know that there aren't many of us here but perhaps someone has some ideas.
my F06 developed strange behavior, first I started to get warnings on the dash saying the Auto Start/Stop is malfunctioning. It would come and go and recently started to do it pretty persistently, but also, not sure if it's related (if so I really don't understand how that can be?) hill hold assist seems to not work anymore.
While auto start/stop is an annoyance as it's pretty pointless feature especially on a manual transmission car, hill assist is a handy feature

Any troubleshooting clues anyone?

Thank you!

[rotomoto712]

Wow. So I just went to check, and I didn't even realize that my manual had auto start/stop! It was set to off, and unlike modern BMWs, it must remember the last setting. Anyways, if you have access to ISTA or similar, I would run a scan and do diagnostics on the system. I don't think hill assist is related, but I am far from an expert on that.

[pokrovsky]

Originally Posted by rotomoto712

Wow. So I just went to check, and I didn't even realize that my manual had auto start/stop! It was set to off, and unlike modern BMWs, it must remember the last setting. Anyways, if you have access to ISTA or similar, I would run a scan and do diagnostics on the system. I don't think hill assist is related, but I am far from an expert on that.

Thanks, I do have a cable but it's been a while since I messed with BMW programming. I used to tweak my e90 335i all the time but leave this unicorn mostly alone

[JDMSteven]

I believe you'll have an auxiliary battery under the trunk panel and when they get weak the auto stop start system can have issues.

[pokrovsky]

Originally Posted by JDMSteven

I believe you'll have an auxiliary battery under the trunk panel and when they get weak the auto stop start system can have issues.

thank you!

[pokrovsky]

Nope. No aux battery in my trunk

[pokrovsky]

Just a follow up. It is not a battery issue. I replaced the battery as the original one was getting tired and showed 19% life on the BMW diagnostic tool at the dealer. Got the brand new OEM one and properly coded/registered.
The Auto start/stop malfunction didn't go away neither hill assist and then it dawned on me that I only see the issue of hill assist not working when this auto start stop warning comes up and it does work when there is no error. It must be related to some sort of a clutch pedal switch/sensor!!! I have not dug there and wanted to ask people here.
It makes tons of sense to be related in this case as failing sensor/switch will deem auto start and hill hold inoperable, right?!?!
Anybody has a service manual that indicates that part by any chance?