DSC and Flat Tyre warning failure (2008 E92 M3)

Discussion in 'Faults, Fixes and Solutions' started by zito, Jul 11, 2012.

  1. 11 Jul 2012 at 9:29 AM #1
    zito

    zito On the path

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    About 30 seconds after starting up I had a DSC Failure warning message come up on the iDrive screen, saying that the DSC isn't active and that I should tak the car to BMW Service a.s.a.p.

    This was quickly followed by another saying the flat tyre sensors are inactive.

    The car then goes into a limp mode with power restricted, a 950rpm tickover and max rpm limited to 4000rpm.

    Has anybody else had this happen to their car? If so what was the cause / fix / cost of fix? Not wanting to get stung for anything like a new DSC/ECU unit if all that's gone is a sensor somewhere...

    Thanks
     
    Last edited: Jul 11, 2012
  2. 11 Jul 2012 at 10:22 PM #2
    zito

    zito On the path

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    Car back to normal when I started it up when taking it to my local specialist.

    I had the diagnostic run and it showed the logged fault code relating to the actuator which controls the throttle bodies on the right cylinder bank. He explained that they can stick sometimes (his friend's E92 M3 has had this problem twice), often happening in wet weather.

    He told me that the DSC error likely occurred due to the wheel speed not matching that which the ECU unit expects for that level of throttle opening. Seems one bank of cylinders operating normally + the other not open to the same level gives enough power for a wheel speed outside of what is expected by the ECU with the not (as) fully open throttle bodies on one cylinder bank.

    Given the recent weather and me going through a few deep puddles yesterday, plus driving through muddy B-roads / standing water and that I left the car outside in the sun today, this explanation fits. Will still renew my warranty however as a new actuator is £600.

    Hope this helps if anyone else sees the same warning. I'll be more wary of puddles in future..
     
  3. 12 Jul 2012 at 2:08 PM #3
    blondini

    blondini Achieved official socks

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    Whut! :rolleyes:

    Any fault detected with throttle actuators or throttle position sensors will result in ECU invoking limp mode for safety reasons. At the same time the ECU will also disable DSC because DSC needs to be able to modulate the throttle.
     
  4. 13 Jul 2012 at 8:40 PM #4
    Maff H 90

    Maff H 90 Wearing official underwear

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    What you have described sounds like exactly what happened to mine mate and I'm sure you will end up having to get your throttle actuators replaced. The user in the thread in the link below had the same problem aswell, let us know how you get on with it mate.

    http://forums.m3cutters.co.uk/showthread.php?t=54388
     
  5. 17 Jul 2012 at 7:43 AM #5
    s6otty

    s6otty A mere Chipper

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    I replaced a Throttle Actuator on mine last year, £600 ish, next day from my local dealer, about an hour to fit.

    BUT, I don't think this is actuator, it doesn't link to Tyre Pressure Monitoring.

    I would go for a rear wheel bearing, I know it sounds odd, but it was on mine. I had the same faults as you, quite worrying since I was on my way back from Oulton Park - chasing bikes!

    Scott
     
  6. 17 Jul 2012 at 11:07 AM #6
    Maff H 90

    Maff H 90 Wearing official underwear

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    Please see the link in my post above which shows another forum member describe the same symptoms as the OP and one of his warning messages was about his tyre pressure warning system becoming inactive.
     
  7. 9 Oct 2018 at 8:22 PM #7
    Ritch M3

    Ritch M3 A mere Chipper

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    Did this ever get solved? I’m experiencing the same issue.
     
  8. 21 Jul 2021 at 4:29 PM #8
    VIC13

    VIC13 A mere Chipper

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    Just had the same issue on my car ealier this week.

    Started the car as normal and but unfortunately I was presented with the DSC failure and tyre pressure warning. After turning the car off for about 10 minutes and restarting the car, all was fine and the faults had gone. Took the car for a drive, let it warm up and no issues red lining.

    Plugged in Carly and could see a fault with one of the throttle actuators, which wasn't really a surprise as I had a feeling this would creep up at some point.

    Gave Jason a ring from Rebuild.org.uk and explained what had happened and he explained that its a sign the actuators are on their way out and even though its happened once, the fault will become more and more common as time progresses, untill they fail completely. My car is at 51k and that's around the time the actuators start to fail.

    Got him booked in on Saturday to come and replace both at my place. Will let you know how I get on!
     

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