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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 05-01-2013, 02:14 PM
4Doorz 4Doorz is offline
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Location: Newport News, VA
 
Join Date: Jul 2012
Posts: 9
Mein Auto: 2006 325i
Exclamation DTC Light Flashing After wheel change.

Hello everyone.

So i bought new wheels. Put them on last night.

Prev I had:

225/45/17 Front
255/40/17 Rear

Current i have:

225/45/18
255/35/18

Ok So what is happening it, i went to work this morning and dtc light is flashing at 55 mph.
And it wont go over 55 mph.

It works fine if i turn off DTC

Ive looked it up and people say its cause of the tire difference, the car is confussed on the rotation, Is this correct or is it something else?

And if this is the problem, i have a few options i cant choose.

I bought these and painted them with the plasti dip.
Should i change the fronts to 225/40/18 and have the chance of the place scratching the paint?

OR

Trade the wheels for ones with 225/40/18 and 255/35/18 tires?

OR........Just keep turning off DTC everytime i drive it. =/
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  #2  
Old 05-02-2013, 07:05 AM
aneal000 aneal000 is offline
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Location: St. Louis
 
Join Date: Feb 2013
Posts: 49
Mein Auto: 2007 335xi
According to your profile it looks like a 325i, but this seems like something I would expect to see on an X?
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  #3  
Old 05-02-2013, 07:16 AM
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Zooks527 Zooks527 is offline
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Mein Auto: 2009 335i xDrive coupe
Your previous tire diameters were 25.0" each.

You're currently 26.0" on the front and 25.0" on the back. The wheel speed sensors are seeing the 4% difference as increased speed in the back, i.e. it thinks you're spinning the rear wheels slightly. Doesn't like that. Wants to keep the rear end from spinning out, so it's limiting power.

225-40/18 tires in the front will take the front diameter down to 25.1", and the system will hopefully accept that. Live with the tire guys possibly scratching the paint on the wheels.
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Last edited by Zooks527; 05-02-2013 at 12:05 PM.
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  #4  
Old 05-02-2013, 08:35 AM
bbbuzzy bbbuzzy is offline
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Mein Auto: '06 330i (6MT, ZSP, ZPP)
If you are driving the '06 325, this model does not have TPMS but uses the older flat tire monitor system that senses changes in wheel rotation speeds as an indicator for a flat. If you just swapped wheels that change diameters, you should reset the FTM, which can be done with the BC stalk. The protocol is in your driver's manual.
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  #5  
Old 05-02-2013, 09:07 AM
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tturedraider tturedraider is offline
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Quote:
Originally Posted by Zooks527 View Post
Your previous tire diameters were 25.0" each.

You're currently 26.0" on the front and 25.0" on the back. The wheel speed sensors are seeing the 4% difference as increased speed in the back, i.e. it thinks you're spinning the rear wheels slightly. Doesn't like that. Want to keep the rear end from spinning out, so it's limiting power.

225-40/18 tires in the front will take the front diameter down to 25.1", and the system will hopefully accept that. Live with the tire guys possibly scratching the paint on the wheels.
This. 255/35 in the rear require 225/40 in the front.
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  #6  
Old 05-02-2013, 01:03 PM
aznalan15 aznalan15 is offline
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Location: sf
 
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Mein Auto: e36 328i e46 m3
i believe you just hold the tmps button and the light should go on and u just drive it will turn off automatically
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  #7  
Old 05-02-2013, 02:19 PM
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Zeichen311 Zeichen311 is offline
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Location: Here, there or in transit
 
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Posts: 2,528
Mein Auto: '11 335xi Sedan
Quote:
Originally Posted by bbbuzzy View Post
If you are driving the '06 325, this model does not have TPMS but uses the older flat tire monitor system that senses changes in wheel rotation speeds as an indicator for a flat. If you just swapped wheels that change diameters, you should reset the FTM, which can be done with the BC stalk. The protocol is in your driver's manual.
Quote:
Originally Posted by aznalan15 View Post
i believe you just hold the tmps button and the light should go on and u just drive it will turn off automatically
The problem has nothing to do with FTM or TPMS. OP has mismatched tires on the car, causing the DSC computer to freak out over the difference in wheel speed between the front and rear axles.
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  #8  
Old 05-02-2013, 03:08 PM
4Doorz 4Doorz is offline
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Location: Newport News, VA
 
Join Date: Jul 2012
Posts: 9
Mein Auto: 2006 325i
Thanks guys, i had my buddy scan it to see if there was a sensor bad, and no codes.

Hes a bmw expert and he is thinking its the tire size also.

Im going to go back to the shop and put on 225/40/18's and see that happens
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