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      11-05-2020, 02:51 PM   #1
mvgossman
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2021 X5, Start-Stop override

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Is there a hack to get rid of the start-stop feature? My understanding so far is that it is considered a necessary part of the emissions control to have it and it can't be officially eliminated, but is there an unofficial aftermarket way around it? I like having that capability in my 440ix.

I am reminded to inquire because I got the post-purchase call from BMW USA today, I asked how to bypass it, and she actually told me that you can put it in Sport mode and it turns this off. This is a big help because it's mostly stop and go traffic that makes it a pain in the neck, I can switch to Sport temporarily.
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      11-05-2020, 04:13 PM   #2
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I have solved the issue for me by programming all “sport individual “ settings to comfort so much essentially I’m driving in comfort mode without the having auto stop/start “feature”

I use this in stop and go traffic but for occasional stops I find the mild hybrid way less annoying than other cars I have driven with auto stop/start

Last edited by PeterK1; 11-05-2020 at 05:46 PM..
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      11-05-2020, 07:21 PM   #3
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One scenario that we haven't gotten tested yet is to continue doing what was done in the 19s and 20s. Code the vehicle to remember the last state of the ASS system and then put it into Sport to have the system turn off. Hopefully on the next start the ASS will be off.

It was brought up that this will not work due to how the Sport mode overrides the ASS system rather than shutting it off but it may be worth a try. If not, PeterK1's workaround would be the solution.
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      11-05-2020, 07:28 PM   #4
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Quote:
Originally Posted by TurtleBoy View Post
One scenario that we haven't gotten tested yet is to continue doing what was done in the 19s and 20s. Code the vehicle to remember the last state of the ASS system and then put it into Sport to have the system turn off. Hopefully on the next start the ASS will be off.

It was brought up that this will not work due to how the Sport mode overrides the ASS system rather than shutting it off but it may be worth a try. If not, PeterK1's workaround would be the solution.
I have been told by a couple coders that will not work. The only option at this point is to code the car to start in sport individual mode and set that mode with whatever settings you want.
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      11-05-2020, 07:31 PM   #5
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Originally Posted by malba2366 View Post
I have been told by a couple coders that will not work. The only option at this point is to code the car to start in sport individual mode and set that mode with whatever settings you want.
That is my understanding also but until someone tries it we won't know for sure.
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      11-05-2020, 11:42 PM   #6
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I was pretty upset at first but now I realize the Auto S/S is much more smooth and almost seamless (so far) that it never bothered me.
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      11-05-2020, 11:44 PM   #7
jad03060
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Supposedly, BMW spent some time fine-tuning the engine mounts and played with the starter motor to smooth those things out.
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      11-06-2020, 12:38 AM   #8
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Aww, that sucks if coding doesn't work. If I wasn't able to code it away on my X3, i would have sold the damn car far earlier than now.
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      11-06-2020, 01:20 AM   #9
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Quote:
Originally Posted by mvgossman View Post
Is there a hack to get rid of the start-stop feature? My understanding so far is that it is considered a necessary part of the emissions control to have it and it can't be officially eliminated, but is there an unofficial aftermarket way around it? I like having that capability in my 440ix.

I am reminded to inquire because I got the post-purchase call from BMW USA today, I asked how to bypass it, and she actually told me that you can put it in Sport mode and it turns this off. This is a big help because it's mostly stop and go traffic that makes it a pain in the neck, I can switch to Sport temporarily.
I used BimmerCode and set it to remember the last state (on or off). Super easy, works like a charm. I set it to 'off' and it just stays that way at restart.
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      11-06-2020, 02:48 AM   #10
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Quote:
Originally Posted by Scotchtion View Post
I used BimmerCode and set it to remember the last state (on or off). Super easy, works like a charm. I set it to 'off' and it just stays that way at restart.
You're a bit behind the times. MY2021 X5 40i is a mild hybrid and does NOT have the ASS button, but does have ASS function. So there is no button there to "set it to 'off'". Hence the discussion.
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      11-06-2020, 06:41 AM   #11
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Quote:
Originally Posted by jad03060 View Post
Supposedly, BMW spent some time fine-tuning the engine mounts and played with the starter motor to smooth those things out.
When did they do all this? Do you know if the19s had these improvements? I always found the operation of the ASS on my 19 to be very objectionable and quickly coded the memory function to do away with it.
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      11-06-2020, 07:38 AM   #12
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The AS/S button was removed on the 21’s with the introduction of the mild hybrid.

The start/stop is “milder.” now and less obvious but the only workaround is to drive in Sport mode which disables the AS/S

As I said earlier I have programmed the Sport individual mode with all Comfort settings and use this in stop start traffic. In regular driving the AS/S doesn’t bother me at all.
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      11-06-2020, 07:46 AM   #13
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Has anyone rolled back because the auto start/stop didn't start the car on a hill when you let off the brake?

Coming into my neighborhood, I have a right hand turn where you start to turn, look around the corner and make sure no one is coming down the hill and then you can go. When I wait for someone to finish coming down the hill, the engine will stop, you let off the brake to start to creep forward and the vehicle doesn't restart, you have to hit the gas for it to restart. First time it did it, I rolled back a couple of feet before I figured what was happening, luckily no one was behind me.
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      11-06-2020, 07:49 AM   #14
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Quote:
Originally Posted by PeterK1 View Post
I have solved the issue for me by programming all "sport individual " settings to comfort so much essentially I'm driving in comfort mode without the having auto stop/start "feature"

I use this in stop and go traffic but for occasional stops I find the mild hybrid way less annoying than other cars I have driven with auto stop/start
Quote:
Originally Posted by PeterK1 View Post
I have solved the issue for me by programming all "sport individual " settings to comfort so much essentially I'm driving in comfort mode without the having auto stop/start "feature"

I use this in stop and go traffic but for occasional stops I find the mild hybrid way less annoying than other cars I have driven with auto stop/start
I do the exact same and I agree. The mild hybrid makes it livable
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      11-06-2020, 10:43 AM   #15
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As already mentioned...sport mode should cancel the ASS...and you can use either the sport mode switch...or you can push the gear shift lever over into sport mode.

If you don't want to always be in sport mode...and you don't have any coding software or app...when ASS becomes annoying while driving and coming to a stop (like city/urban driving)...you can quickly stop ASS by pushing your gear shift lever over into the S/M gate. Just a suggestion vs selecting the sport mode which requires a bit more concentration to engage vs quickly pushing the gear shift lever over to the left. You can quickly push it back to the right if you prefer COMFORT mode or ECO PRO mode.
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Last edited by Qsilver7; 11-07-2020 at 09:57 AM..
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      11-06-2020, 10:57 AM   #16
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Quote:
Originally Posted by ND40oz View Post
Has anyone rolled back because the auto start/stop didn't start the car on a hill when you let off the brake?

Coming into my neighborhood, I have a right hand turn where you start to turn, look around the corner and make sure no one is coming down the hill and then you can go. When I wait for someone to finish coming down the hill, the engine will stop, you let off the brake to start to creep forward and the vehicle doesn't restart, you have to hit the gas for it to restart. First time it did it, I rolled back a couple of feet before I figured what was happening, luckily no one was behind me.
That shouldn't happen, hill start assist should hold the brakes as far as I know until the vehicle moves forward. I have a 50i so I still have the button, but I happen to have a MY21 40i loaner. I'll do some testing today on a hill with that exact right turn situation in my area.
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      11-06-2020, 01:16 PM   #17
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I thought I would hate it but honestly I dont even realize it anymore. the 48v helps a lot with that.
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      11-06-2020, 01:56 PM   #18
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Quote:
Originally Posted by GOLFFRR View Post
I thought I would hate it but honestly I dont even realize it anymore. the 48v helps a lot with that.
Quote:
Originally Posted by GOLFFRR View Post
I thought I would hate it but honestly I dont even realize it anymore. the 48v helps a lot with that.
I completely agree. If you still care just code the car to start in Sport Individual and set all Sport Individual parameters to comfort.
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      11-06-2020, 02:02 PM   #19
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Quote:
Originally Posted by hkleyman View Post
That shouldn't happen, hill start assist should hold the brakes as far as I know until the vehicle moves forward. I have a 50i so I still have the button, but I happen to have a MY21 40i loaner. I'll do some testing today on a hill with that exact right turn situation in my area.
Yeah, I'm guessing hill start assist is only holding for 2 seconds like it does with a manual/DCT and then it starts to roll back. I'm typically in Sport Individual but was driving around in Adaptive just to try things out when it happened.

I could have sworn with my G01 it would restart when I removed my foot from the brake and I didn't have to hit the accelerator pedal but it seems to work differently with the new 48v then I'm remembering. Thanks for doing some testing!
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      11-06-2020, 02:05 PM   #20
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BMW should just put the button back. The button blank is there anyways. Mercedes has it there for its 48V mild hybrids so I don't see why BMW can't do the same.
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      11-06-2020, 02:07 PM   #21
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I turn the autohold function on...when you come to a full stop, it sets the brakes. It only releases them when you press the accelerator pedal...no creeping forward or backwards. On mine, it remembers that setting. On an older BMW, it defaulted to off each time, so I appreciate it on the new model. I think it's available on most if not all BMWs. Try that and see if it helps and let us know.
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      11-06-2020, 02:17 PM   #22
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Quote:
Originally Posted by jad03060 View Post
I turn the autohold function on...when you come to a full stop, it sets the brakes. It only releases them when you press the accelerator pedal...no creeping forward or backwards. On mine, it remembers that setting. On an older BMW, it defaulted to off each time, so I appreciate it on the new model. I think it's available on most if not all BMWs. Try that and see if it helps and let us know.
I do like that setting sometimes but sometimes it pisses me off when I'm trying to park in a tight spot and it keeps locking up the brakes
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