Question on DSC

tecnica · #1 02-19-2009, 01:14 AM

Alright, my first bug.

I drive the same path at the same speeds everyday. I've been doing this in the X5 since November on clear roads, wet roads, snowy roads and icy roads.

This past week, on one of the off-ramps my DSC 4x4 light turns on and stabilty control is activated. I'm unsure why. Playing with it, it seems that if I'm driving at a moderate speed and turn right, it activates. There seems to be no need for this. It bogs down the vehicle and actually causes me to lose my center line with the road. I haven't found if it does it going left as there arn't too many places with a wide sweeping left turn. I turned DSC off and went around the turn today, easy as pie. Turning it back on, and the X5 struggled around the corner.

Then as I'm driving home in my parking lot, I turned it off and felt as if I dropped something that was dragging along with the car. It was an instant improvement.

Additionally, it does seem like the X5 has been more 'floaty' on the highway. Though, this may be placebo of my 'trying to find a problem.'

Tires are brand new winter tires, same ones since November.

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Weasel · #2 02-19-2009, 01:27 AM

The year or your X and other variables would be helpful, as pre-facelift and post facelift have different systems. And are your winter wheels all the same, or staggered. What sizes?

tecnica · #3 02-19-2009, 01:42 AM

2004 3.0. Tires are all the same to my knowledge. Stock 17" size (unsure at the moment) 65k miles

WhiteWhip · #4 02-19-2009, 02:24 AM

did u check the air in the tires?

Weasel · #5 02-19-2009, 08:52 AM

If all is good with the running gear, it may be time to have the faults read from the DSC, EGS and VTG modules etc. See what turned the light on. It may be something simple like a wheel speed sensor, but the only way to know is to have it properly diagnosed.

tecnica · #6 02-19-2009, 09:59 AM

the light isn't actually on all the time, it just turns on flashing during the turns. I'll check the pressure, and actually that does make sense. My next guess was a faulty wheel speed sensor. Perhaps its saying the wheel is spinning slower than it actually is. Will there be codes if there is no dummy-light?

mrbmwx5 · #7 02-19-2009, 10:35 AM

Quote:

Originally Posted by tecnica

the light isn't actually on all the time, it just turns on flashing during the turns. I'll check the pressure, and actually that does make sense. My next guess was a faulty wheel speed sensor. Perhaps its saying the wheel is spinning slower than it actually is. Will there be codes if there is no dummy-light?

you means just the triangle light?...if it just flashing.... it is normal your wheels losing grips and the system is searching for for even surface for the wheels

tecnica · #8 02-19-2009, 01:00 PM

I'm aware that the flashing light means loss of traction. My question is why now, what could be causing this?

Weasel · #9 02-19-2009, 01:49 PM

If this is happening on dry road surfaces, I'd have the faults read... see if there are any. May save time, money and mental health having it professionally diagnosed at the dealer if you can duplicate it regularly.

tecnica · #10 02-21-2009, 09:03 PM

Ended up being a tire pressure problem.

I picked up a rather large nail in the driver's rear tire. The visual inspection showed average pressure, but after a test it was less than 20. Far away from my 39 that it should be at. It now makes sense with the right turn as the body leans left and puts alot of pressure on those wheels.

Thanks for the help guys. Hopes this thread saves some grief for someone else.

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