Gearbox issue

Sgm123 · 08-16-2019, 04:22 PM

Evening all,

Recently my 340i with the zf8 gearbox has started switching into park when I stop at traffic lights. It is not every time seems to be intermittent. Has anyone else experienced this and what was causing it.

Thanks Stu

330XDave · 08-16-2019, 04:29 PM

How does the gearbox know you've stopped at traffic lights?

RoShambolt · 08-16-2019, 06:04 PM

Quote:

Originally Posted by Stu101

Evening all,

Recently my 340i with the zf8 gearbox has started switching into park when I stop at traffic lights. It is not every time seems to be intermittent. Has anyone else experienced this and what was causing it.

Thanks Stu

I've had mine do this once, stopped in traffic, let my food off the brake and gave it gas to go and I looked like a dick revving it before I realised what it had done.

Can't remember where I read it but people said it was normal in some situations. Sounds like you are having it do it a lot though. Still in warranty?

Are you in manual(gear shifter to the left) when this happens?

thescouselander · 08-17-2019, 03:39 AM

Were you in a lot of stop start traffic? Could be a protection measure against the torque converter getting too hot. Could also be there's some problem with the cooling system. If you've got an OBDII dongle I'd suggest looking at the transmission oil temperature to check it's in spec.

RobUK · 08-17-2019, 07:02 AM

Have had this happen to me twice in the nearly 4yrs I've had the car. Never did fathom it out just assumed I'd done something wrong and kept quiet

Sgm123 · 08-17-2019, 08:57 AM

It never in stop start I’ll just pull up to a set of lights with it in drive and it switches to park. Only seems to happen at lights presume it could be the wait rather than constant stop start. Yes it is still in warranty looks like a visit to the dealer. It’s happened 2 or 3 times in the last few weeks. Same as you Ro go to pull away and your sitting there looking like a bit of a twat revving away and not moving

jayakrishnanv · 08-18-2019, 12:54 AM

Switch off start stop with the button above the stater engine button and this won’t happen

RobUK · 09-19-2019, 09:35 AM

Actually had this happen to me again today. Put car in drive and drove 200yds up the road to stop on a T-junction before turning left. ASS cut in as I waited for a car & cyclist to pass. As I took my foot off the brake the engine started up and the car was in neutral!! Both hands were on the wheel at all times. Normally I turn off ASS but there is obviously some very rare condition that triggers the car putting itself into neutral

RoShambolt · 09-20-2019, 06:08 AM

Quote:

Originally Posted by RobUK

Actually had this happen to me again today. Put car in drive and drove 200yds up the road to stop on a T-junction before turning left. ASS cut in as I waited for a car & cyclist to pass. As I took my foot off the brake the engine started up and the car was in neutral!! Both hands were on the wheel at all times. Normally I turn off ASS but there is obviously some very rare condition that triggers the car putting itself into neutral

Neutral?! I've never had that, just park once. You had a dealer look at it yet?

RobUK · 09-20-2019, 08:52 AM

Yeah was definitely neutral as I didn't have to press the button to engage Drive again. Happens so rarely but car is due in for it's MOT in the next six weeks and has extended warranty so maybe I'll mention it to them.

RoShambolt · 10-05-2019, 05:09 AM

Quote:

Originally Posted by Stu101

It never in stop start I'll just pull up to a set of lights with it in drive and it switches to park. Only seems to happen at lights presume it could be the wait rather than constant stop start. Yes it is still in warranty looks like a visit to the dealer. It's happened 2 or 3 times in the last few weeks. Same as you Ro go to pull away and your sitting there looking like a bit of a twat revving away and not moving

Did you get this looked at by the dealer?, my car did it yesterday morning at a round about in rush hour, I was at the front of traffic! Didn't go down well.

ADE335D · 11-21-2019, 02:43 AM

This seems to happen on mine after the engine has been 'stopped' for a while (say at traffic lights) then it restarts on its own, without taking my foot off the brake. 90% of the time in these circumstances it goes into park.

I'm now ready for it and react accordingly. I'll get round to visiting the dealer soon.

Londoner · 11-21-2019, 02:50 AM

Happened to me as well the other day. Feels like a feature of some sort.

archerz · 11-21-2019, 03:23 AM

Not noticed it happen to mine. although I've disabled ASS. (f31 335d)

Sgm123 · 11-21-2019, 05:25 AM

It never happened again I called the dealer and they thought it was a feature to prevent overheating of the gearbox I believe. I am going on for a service next month so will get them
To double check and report back then.

Mustard3 · 11-21-2019, 08:06 AM

I had this several times in a month earlier in the year, and it hasn't happened again since.

Sgm123 · 12-12-2019, 04:32 PM

Chaps had a service yesterday and there is a bmw bulletin regarding this. My car has not flicked up any codes so nothing they will do until it does it again. Worth popping in an seeing what they will do. Presume it could be an update but would be good to understand if you get any feedback.

One thing to note my battery was apparently low
So they did mention that could be a cause.

08-16-2019, 04:22 PM	#1
Sgm123 Second Lieutenant 54 Rep 281 Posts Drives: Bmw Join Date: Aug 2017 Location: Hertfordshire iTrader: (0)	Gearbox issue Evening all, Recently my 340i with the zf8 gearbox has started switching into park when I stop at traffic lights. It is not every time seems to be intermittent. Has anyone else experienced this and what was causing it. Thanks Stu
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08-16-2019, 04:29 PM	#2
330XDave Major 629 Rep 1,470 Posts Drives: 330d xDrive Touring Join Date: Jun 2018 Location: Nottingham, UK iTrader: (0)	How does the gearbox know you've stopped at traffic lights?
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08-17-2019, 03:39 AM	#4
thescouselander Captain 206 Rep 623 Posts Drives: G20 330i Join Date: Jul 2018 Location: UK iTrader: (0)	Were you in a lot of stop start traffic? Could be a protection measure against the torque converter getting too hot. Could also be there's some problem with the cooling system. If you've got an OBDII dongle I'd suggest looking at the transmission oil temperature to check it's in spec.
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08-17-2019, 07:02 AM	#5
RobUK Brigadier General 2810 Rep 4,935 Posts Drives: 340i MPPSK Join Date: Jun 2012 Location: Sussex, N.Yorks, UK iTrader: (0) Garage List 2015 340i MPPSK [0.00] 2001 Yamaha FZS1000 [0.00]	Have had this happen to me twice in the nearly 4yrs I've had the car. Never did fathom it out just assumed I'd done something wrong and kept quiet __________________ Life is a state of mind
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08-17-2019, 08:57 AM	#6
Sgm123 Second Lieutenant 54 Rep 281 Posts Drives: Bmw Join Date: Aug 2017 Location: Hertfordshire iTrader: (0)	It never in stop start I’ll just pull up to a set of lights with it in drive and it switches to park. Only seems to happen at lights presume it could be the wait rather than constant stop start. Yes it is still in warranty looks like a visit to the dealer. It’s happened 2 or 3 times in the last few weeks. Same as you Ro go to pull away and your sitting there looking like a bit of a twat revving away and not moving
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08-18-2019, 12:54 AM	#7
jayakrishnanv Lieutenant 81 Rep 500 Posts Drives: BMW G20 M340d Join Date: Mar 2011 Location: West Midlands iTrader: (0) Garage List 2022 BMW G20 M340d [10.00]	Switch off start stop with the button above the stater engine button and this won’t happen
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09-19-2019, 09:35 AM	#8
RobUK Brigadier General 2810 Rep 4,935 Posts Drives: 340i MPPSK Join Date: Jun 2012 Location: Sussex, N.Yorks, UK iTrader: (0) Garage List 2015 340i MPPSK [0.00] 2001 Yamaha FZS1000 [0.00]	Actually had this happen to me again today. Put car in drive and drove 200yds up the road to stop on a T-junction before turning left. ASS cut in as I waited for a car & cyclist to pass. As I took my foot off the brake the engine started up and the car was in neutral!! Both hands were on the wheel at all times. Normally I turn off ASS but there is obviously some very rare condition that triggers the car putting itself into neutral __________________ Life is a state of mind
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09-20-2019, 08:52 AM	#10
RobUK Brigadier General 2810 Rep 4,935 Posts Drives: 340i MPPSK Join Date: Jun 2012 Location: Sussex, N.Yorks, UK iTrader: (0) Garage List 2015 340i MPPSK [0.00] 2001 Yamaha FZS1000 [0.00]	Yeah was definitely neutral as I didn't have to press the button to engage Drive again. Happens so rarely but car is due in for it's MOT in the next six weeks and has extended warranty so maybe I'll mention it to them. __________________ Life is a state of mind
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11-21-2019, 02:43 AM	#12
ADE335D Adie 3 Rep 8 Posts Drives: 2016 335d Join Date: Aug 2019 Location: Derbyshire iTrader: (0)	This seems to happen on mine after the engine has been 'stopped' for a while (say at traffic lights) then it restarts on its own, without taking my foot off the brake. 90% of the time in these circumstances it goes into park. I'm now ready for it and react accordingly. I'll get round to visiting the dealer soon.
	Appreciate 0 Quote

11-21-2019, 02:50 AM	#13
Londoner Lieutenant 168 Rep 470 Posts Drives: 340i msport+ MPPSK Join Date: Jun 2019 Location: London iTrader: (0)	Happened to me as well the other day. Feels like a feature of some sort.
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11-21-2019, 03:23 AM	#14
archerz First Lieutenant 375 Rep 337 Posts Drives: F31 335D Join Date: Aug 2019 Location: North East iTrader: (0) Garage List 2016 BMW F31 335XD [0.00]	Not noticed it happen to mine. although I've disabled ASS. (f31 335d)
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11-21-2019, 05:25 AM	#15
Sgm123 Second Lieutenant 54 Rep 281 Posts Drives: Bmw Join Date: Aug 2017 Location: Hertfordshire iTrader: (0)	It never happened again I called the dealer and they thought it was a feature to prevent overheating of the gearbox I believe. I am going on for a service next month so will get them To double check and report back then.
	Appreciate 1 Londoner168.00 Quote

11-21-2019, 08:06 AM	#16
Mustard3 Lieutenant 99 Rep 403 Posts Drives: F31 340i Join Date: Sep 2011 Location: UK iTrader: (1)	I had this several times in a month earlier in the year, and it hasn't happened again since. __________________ Old flames: S3, M235i, E92 335d, Alpina B3, E46 M3
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12-12-2019, 04:32 PM	#17
Sgm123 Second Lieutenant 54 Rep 281 Posts Drives: Bmw Join Date: Aug 2017 Location: Hertfordshire iTrader: (0)	Chaps had a service yesterday and there is a bmw bulletin regarding this. My car has not flicked up any codes so nothing they will do until it does it again. Worth popping in an seeing what they will do. Presume it could be an update but would be good to understand if you get any feedback. One thing to note my battery was apparently low So they did mention that could be a cause.
	Appreciate 2 azuritschwarz347.50 Londoner168.00 Quote