Two problems related to engine belts and pulleys have been reported for the 2010 BMW X5. The most recently reported issues are listed below.
The engine belt idler pulley bolt broke causing a sudden loss of power steering when the serpentine belt came off the alternator and power steering pump. This is the same problem associated with recall 12v550000 a few years ago. The dealer said the vehicle was fixed under the recall but it was before I owned it so I don't know for sure. I believe the recall should be reinstated. The vehicle was moving on a residential street at less than 25 mph and my mom was driving. If she had been going any faster she would have crashed.
I had this problem with my 2010 BMW X5 35d breakdown. It said the charging malfunction on the screen. Power steering was lost. Wheel steer was hard to manuever. Hard to move. I almost got in an accident. The battery died. Everything just not function bc of lost in power steering. When I towed my car to BMW manhattan, the service advisor told me there was no recall for my BMW X5 35 d. She told me the dealer would charge me about $900 to replace pulley belt bolt and battery and etc . I told her it's one of recall. After that the service advisor told me that she will call me back on that which she never did, my car was still at BMW manhattan. It's been a week in the dealer. I'm still waiting to know what happen.