Auto start/stop question

bcjbmwm3 · 02-26-2017, 02:01 PM

So lately my auto start stop on my m235i has not been working. It normally works in comfort and eco pro, but it hasn't been. I'm wondering if the fact it's been cold we're I am lately has anything to do with it. Does anyone have any ideas, or should I just take it into the dealer.

Thanks

BMWZ4 · 02-26-2017, 02:32 PM

Quote:

Originally Posted by bcjbmwm3

So lately my auto start stop on my m235i has not been working. It normally works in comfort and eco pro, but it hasn't been. I'm wondering if the fact it's been cold we're I am lately has anything to do with it. Does anyone have any ideas, or should I just take it into the dealer.

Thanks

I was told once it had something to do with temp.

big_fooot · 02-26-2017, 02:39 PM

Yeah it's just the cold.

wntrsnowg · 02-26-2017, 03:12 PM

If you look in the owners manual (in iDrive or the physical manual) there are a ton of situations where the car won't auto start/stop. Engine could be too hot or too cold, too cold or hot outside, stop/go traffic, seat belts aren't fastened, etc.

bcjbmwm3 · 02-26-2017, 04:17 PM

Ah, figured that. Thanks for the replies.

dphjr · 02-27-2017, 01:16 PM

It definitely is temperature related. In my area, the temps can fluctuate quite a bit (Friday it was 73F, yesterday it got down to around 30F). If the temperature is too cold or if the engine hasn't warmed up enough, it will temporarily disable auto start/stop. Perfectly normal.

Oyinko · 03-25-2017, 08:22 PM

Having the same issue but it's not related to the cold as it's always between 50 and 75 here in San Francisco.

Wondering if it is related to a low battery? I haven't been driving much recently and I know that the auto start stop will not activate if a battery is low.

However, even after a 2 hour drive today on the freeway and city, my auto start stop was still not working.

When I activate the secret menu, the voltage of the battery reads 12v (when the engine is off). Is that good enough for the auto-start to work?

bcjbmwm3 · 03-25-2017, 08:26 PM

Quote:

Originally Posted by Oyinko

Having the same issue but it's not related to the cold as it's always between 50 and 75 here in San Francisco.

Wondering if it is related to a low battery? I haven't been driving much recently and I know that the auto start stop will not activate if a battery is low.

However, even after a 2 hour drive today on the freeway and city, my auto start stop was still not working.

When I activate the secret menu, the voltage of the battery reads 12v (when the engine is off). Is that good enough for the auto-start to work?

My issue was definitely the cold, when it warmed up here, it started to work again. As for your issue, It could be the battery, but i'm not sure. I would just take it in if its still under warranty.

Fabspeed Motorsport · 03-28-2017, 11:07 AM

There is a large list of criteria the car needs to meet before the Auto Start/Stop will activate. The temperature is one of them - on both ends of the spectrum. If it is above 95 degrees F or below 37.5 degrees F, it will not shut off. Below is a list I found from an old thread of other criteria that needs to be met:

The car is coasting (manual transmission)
Brake vacuum reading is too low (manual transmission)
Insufficient brake pedal pressure is being applied to hold the vehicle stationary (automatic transmission)
Stopping on a hill/downhill with a 12% or greater gradient
If the steering angle is more then 6 degrees
If the steering wheel is still be moved after approximately one second of coming to a stop
The system has not yet be activated by going over a speed of 5mph for automatics, 3mph for manuals since the last engine switch off
If the gas pedal is being pressed (engine must be at idle speed only)
You're coming to a stop from reverse
The driver gets out of the car
If Hill Decent Control (HDC) is activated
If the engine is not up to temperature
If the carbon canister is being purged
if the grade of the fuel is too low for the engine
Transmission adaptation is active (automatic transmission)
The hydraulic pressure accumulator is not yet up to pressure (automatic transmission)
Stop-and-go traffic - system is only activated by driving over 5mph for automatics, 3mph for manuals
Batter charge is low
Outside temperature is colder then 37.4 F / 3 C
Outside temperature above 95 F / 35 C and the air conditioning system is on
Fogging of the windshield is detected by the IHKA system
Climate control system is on but passenger compartment has not yet reached desired temperature
ABS system was used when coming to a stop

via @Ron Scott --> http://f30.bimmerpost.com/forums/sho...d.php?t=663713

02-26-2017, 02:01 PM	#1
bcjbmwm3 Second Lieutenant 340 Rep 239 Posts Drives: 2020 BMW M340i xDrive Join Date: Jul 2013 Location: New Lenox, Illinois iTrader: (0)	Auto start/stop question So lately my auto start stop on my m235i has not been working. It normally works in comfort and eco pro, but it hasn't been. I'm wondering if the fact it's been cold we're I am lately has anything to do with it. Does anyone have any ideas, or should I just take it into the dealer. Thanks __________________ Current - 2020 G20 M340i Mineral White/Cognac Past - 2016 F22 M235i Dinan S3, 2009 E92 M3, 2010 Nissan 370Z, 2004 E46 330i, 2003 E46 325i, 1999 E46 323i
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02-26-2017, 02:39 PM	#3
big_fooot Private 7 Rep 75 Posts Drives: 2016 235 Join Date: Oct 2010 Location: Winnipeg iTrader: (0)	Yeah it's just the cold.
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02-26-2017, 03:12 PM	#4
wntrsnowg First Lieutenant 106 Rep 350 Posts Drives: 2016 M235i Join Date: Feb 2017 Location: San Diego iTrader: (9)	If you look in the owners manual (in iDrive or the physical manual) there are a ton of situations where the car won't auto start/stop. Engine could be too hot or too cold, too cold or hot outside, stop/go traffic, seat belts aren't fastened, etc.
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02-26-2017, 04:17 PM	#5
bcjbmwm3 Second Lieutenant 340 Rep 239 Posts Drives: 2020 BMW M340i xDrive Join Date: Jul 2013 Location: New Lenox, Illinois iTrader: (0)	Ah, figured that. Thanks for the replies. __________________ Current - 2020 G20 M340i Mineral White/Cognac Past - 2016 F22 M235i Dinan S3, 2009 E92 M3, 2010 Nissan 370Z, 2004 E46 330i, 2003 E46 325i, 1999 E46 323i
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02-27-2017, 01:16 PM	#6
dphjr New Member 139 Rep 225 Posts Drives: Alpine White M235i Join Date: Jan 2015 Location: DMV Area iTrader: (0)	It definitely is temperature related. In my area, the temps can fluctuate quite a bit (Friday it was 73F, yesterday it got down to around 30F). If the temperature is too cold or if the engine hasn't warmed up enough, it will temporarily disable auto start/stop. Perfectly normal. __________________ 2015 ///M235i \| Alpine White \| 8AT \| RW Carbon Front & Rear Lips \| Autotecknic Paddles \| MP Side Decals \| AWE Axelback \| Shifteck DP \| MHD Stage 2+ \| BMS Intake \| FTP Charge Pipe \| VRSF FMIC
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03-25-2017, 08:22 PM	#7
Oyinko Private First Class 40 Rep 176 Posts Drives: M235i Join Date: Apr 2014 Location: SF Bay Area iTrader: (0)	Having the same issue but it's not related to the cold as it's always between 50 and 75 here in San Francisco. Wondering if it is related to a low battery? I haven't been driving much recently and I know that the auto start stop will not activate if a battery is low. However, even after a 2 hour drive today on the freeway and city, my auto start stop was still not working. When I activate the secret menu, the voltage of the battery reads 12v (when the engine is off). Is that good enough for the auto-start to work?
	Appreciate 0 Quote

03-28-2017, 11:07 AM	#9
Fabspeed Motorsport 1006 Rep 1,653 Posts Drives: BMW M235i Join Date: May 2015 Location: Fort Washington, PA iTrader: (0)	There is a large list of criteria the car needs to meet before the Auto Start/Stop will activate. The temperature is one of them - on both ends of the spectrum. If it is above 95 degrees F or below 37.5 degrees F, it will not shut off. Below is a list I found from an old thread of other criteria that needs to be met: The car is coasting (manual transmission) Brake vacuum reading is too low (manual transmission) Insufficient brake pedal pressure is being applied to hold the vehicle stationary (automatic transmission) Stopping on a hill/downhill with a 12% or greater gradient If the steering angle is more then 6 degrees If the steering wheel is still be moved after approximately one second of coming to a stop The system has not yet be activated by going over a speed of 5mph for automatics, 3mph for manuals since the last engine switch off If the gas pedal is being pressed (engine must be at idle speed only) You're coming to a stop from reverse The driver gets out of the car If Hill Decent Control (HDC) is activated If the engine is not up to temperature If the carbon canister is being purged if the grade of the fuel is too low for the engine Transmission adaptation is active (automatic transmission) The hydraulic pressure accumulator is not yet up to pressure (automatic transmission) Stop-and-go traffic - system is only activated by driving over 5mph for automatics, 3mph for manuals Batter charge is low Outside temperature is colder then 37.4 F / 3 C Outside temperature above 95 F / 35 C and the air conditioning system is on Fogging of the windshield is detected by the IHKA system Climate control system is on but passenger compartment has not yet reached desired temperature ABS system was used when coming to a stop via @Ron Scott --> http://f30.bimmerpost.com/forums/sho...d.php?t=663713
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