There may or may not be fault codes. If you can check for codes that will be very helpful.

It could be a slow leak in the system. More often than not a leak will be an airbag. You may be able to see or hear a leak. On level ground, check to see if the gap between the tire and the wheel is lower on one side verses the other. Look to see if the airbags are smooth, not cracked like old rubber gets. Is the light on when you first start it up when it has been sitting overnight or is it intermittent during normal driving?

BMWs are very sensitive to voltage. Sometimes a bad battery or a failing alternator that is not properly changing the battery will generate errors such as sus.inact.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas