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M2 Technical Topics > Track / Autocross / Dragstrip > TPMS warning seems to prevent DCT-Off: Heads up

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      01-29-2018, 04:51 PM   #1
Paddy
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TPMS warning seems to prevent DCT-Off: Heads up

Start of day 2 at Buttonwillow, temps were cold and tires were low because I had adjusted pressure over laps the day before and Low pressure warning came on.
I adjusted pressures back up when I got to the track.
On my first session, I turned DCT off (as you do) but after a few seconds the DCT Off indicator on dash went off.
At this point the TPMS still hadn't registered that the tires were back up to normal pressure.
I tried it again a few times on first lap and it still kept turning off.
I pitted after first lap and tried a few more times to no avail, so at this point I decided better to drive with DCT on that waste time in the pits.

After about 1/4 of the next lap the TPMS light went off and I was able to switch DCT off.

Seems like you need to clock a couple of miles to reset the TPMS.
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      01-29-2018, 04:57 PM   #2
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That's strange. I have an 18 LCI that I'm currently running a winter wheel/tire package with no TPMS and I am still able to drive the car with no DTC
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      01-29-2018, 06:12 PM   #3
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Quote:
Originally Posted by M3PGH View Post
That's strange. I have an 18 LCI that I'm currently running a winter wheel/tire package with no TPMS and I am still able to drive the car with no DTC
Might recognize lack of TPMS and behave differently...
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      01-29-2018, 08:01 PM   #4
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I seem to remember that is correct - that warning is on and you can't turn off that - in fact, maybe sport mode is not avail? I remember at least one other thing not being avail.
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      01-29-2018, 09:14 PM   #5
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Also when it is below freezing mine wouldn't change either.
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      01-31-2018, 10:33 AM   #6
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Quote:
Originally Posted by Paddy View Post
Start of day 2 at Buttonwillow, temps were cold and tires were low because I had adjusted pressure over laps the day before and Low pressure warning came on.
I adjusted pressures back up when I got to the track.
On my first session, I turned DCT off (as you do) but after a few seconds the DCT Off indicator on dash went off.
At this point the TPMS still hadn't registered that the tires were back up to normal pressure.
I tried it again a few times on first lap and it still kept turning off.
I pitted after first lap and tried a few more times to no avail, so at this point I decided better to drive with DCT on that waste time in the pits.

After about 1/4 of the next lap the TPMS light went off and I was able to switch DCT off.

Seems like you need to clock a couple of miles to reset the TPMS.
I believe you mean DSC, not DCT.

There is a lot of info in the Track section of the forum that discusses what’s going on and how to work around it.
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      01-31-2018, 11:56 AM   #7
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Quote:
Originally Posted by ZM2 View Post
I believe you mean DSC, not DCT.

There is a lot of info in the Track section of the forum that discusses what’s going on and how to work around it.
Yes, correct, my bad. I meant DSC.
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      01-31-2018, 12:29 PM   #8
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Quote:
Originally Posted by Paddy View Post
Start of day 2 at Buttonwillow, temps were cold and tires were low because I had adjusted pressure over laps the day before and Low pressure warning came on.
I adjusted pressures back up when I got to the track.
On my first session, I turned DCT off (as you do) but after a few seconds the DCT Off indicator on dash went off.
At this point the TPMS still hadn't registered that the tires were back up to normal pressure.
I tried it again a few times on first lap and it still kept turning off.
I pitted after first lap and tried a few more times to no avail, so at this point I decided better to drive with DCT on that waste time in the pits.

After about 1/4 of the next lap the TPMS light went off and I was able to switch DCT off.

Seems like you need to clock a couple of miles to reset the TPMS.
I took my car out to the city one day that was decent and the temps dropped at night. essentially you have to run the TPMS while driving to get it out of this quasi-limp mode where you are unable to select any mode with limited traction control . it was no fun, car is a drag on comfort lol

edit- it also remains in this mode until you run TPMS, when i got back in my car the next time on a warm weekend, i had to run TPMS before the warning went away. So basically it "remembers" this issue
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      02-05-2018, 02:01 AM   #9
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yup. Gota code out TPMS for the track guys
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      02-05-2018, 10:51 AM   #10
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Here's the pdf to code out TPMS if anyone's interested:

http://f30.bimmerpost.com/forums/sho...8&postcount=24
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      02-05-2018, 04:37 PM   #11
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Yank the sensors out of your wheels then you can turn traction control off. But you can't change it to sport/sport plus.
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      02-05-2018, 06:49 PM   #12
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Quote:
Originally Posted by CosmosMpower View Post
Yank the sensors out of your wheels then you can turn traction control off. But you can't change it to sport/sport plus.
I have no TPM sensors in my wheels and can turn Traction Control off, and use Sport, Sport Plus. Have never had a problem with this.
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      02-05-2018, 07:03 PM   #13
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Quote:
Originally Posted by chief1richard View Post
I have no TPM sensors in my wheels and can turn Traction Control off, and use Sport, Sport Plus. Have never had a problem with this.
You can switch between modes, but throttle and steering response will remain Comfort if you do not have sensors.
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      02-05-2018, 08:10 PM   #14
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Quote:
Originally Posted by ZM2 View Post
You can switch between modes, but throttle and steering response will remain Comfort if you do not have sensors.
Not in my car. My throttle changes between modes. Cant say I've ever noticed any change in steering though. When I start my car up, it is in Comfort, Hit sport, sport plus throttle increases. My last car had adaptive suspension, which changed steering response, I do not notice anything like that on the M2.

Last edited by chief1richard; 02-05-2018 at 08:47 PM..
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      02-05-2018, 08:47 PM   #15
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Quote:
Originally Posted by chief1richard View Post
Not in my car. My throttle changes between modes. Cant say I've ever noticed any change in steering though.
This is the case with no sensors? Are you certain? I ask bc you’d be the first to report the car behaving this way.

Maybe it’s a 2018 or latest ISTEP change?
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      02-05-2018, 09:36 PM   #16
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Quote:
Originally Posted by ZM2 View Post
This is the case with no sensors? Are you certain? I ask bc you’d be the first to report the car behaving this way.

Maybe it’s a 2018 or latest ISTEP change?
It is the case with my 18 LCI. I have no TPM in my winter wheels. I start my m2 and is in Comfort mode. Have a warning on dash which is a small circle. Switch to sport, or sport plus engine revs. I have never noticed any change in steering however in comfort/sprt/sprt plus. It seems the same in every mode to me including when I run summer wheels with TPM's.
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      02-05-2018, 10:48 PM   #17
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I have no TPMS as stated earlier and I am able to use all modes ( different throttle response and heavier steering) and no traction control with my 18 LCI
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      02-06-2018, 07:31 AM   #18
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Quote:
Originally Posted by M3PGH View Post
I have no TPMS as stated earlier and I am able to use all modes ( different throttle response and heavier steering) and no traction control with my 18 LCI
Nice. Guess we’ll have to see if the latest ISTEP creates the same behavior on pre-LCI cars.
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      02-24-2018, 11:44 AM   #19
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Odd...I thought I was going to have problems after lunch (and letting the car cool down) as I checked pressures and they were all around 25psi...went out on tracked with disabled DSC and had no issues. I took a lap to warm everything back up to track temps...

Never experienced limp mode in the car all day...
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      02-24-2018, 01:25 PM   #20
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Quote:
Originally Posted by lax01 View Post
Odd...I thought I was going to have problems after lunch (and letting the car cool down) as I checked pressures and they were all around 25psi...went out on tracked with disabled DSC and had no issues. I took a lap to warm everything back up to track temps...

Never experienced limp mode in the car all day...
What was the build date on your '17, and have you completed any ISTEP updates?

Trying to figure out if BMW updated the software and this problem is now gone from pre-LCI cars.
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      02-24-2018, 03:45 PM   #21
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Quote:
Originally Posted by ZM2 View Post
What was the build date on your '17, and have you completed any ISTEP updates?

Trying to figure out if BMW updated the software and this problem is now gone from pre-LCI cars.
Build date was early 2017 I believe...took delivery in June 2017

Haven't touched iStep but here is mine:


It's also a Performance Edition but I honestly don't think the ECU code is any different
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      02-24-2018, 04:12 PM   #22
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Quote:
Originally Posted by lax01 View Post
Build date was early 2017 I believe...took delivery in June 2017

Haven't touched iStep but here is mine:


It's also a Performance Edition but I honestly don't think the ECU code is any different
Got it. Mine is Oct 2016. Planning on doing an ISTEP update before I get on track this year. Will see if it changes anything.
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