My 2011 550i with 53K miles has this weird problem. It was towed due to a stall following loss control of steering and brakes - a safety issue. After driving for 30m-1h I suddenly got multiple different warning lights before I lost control of steering (stiff like a dead body) and brakes following which the car stalled. This is the third time this had happened in the past 6 months.
The first time it was towed to Advantage dealership and I was told it was a bad battery which did not make sense but the car was running after battery replacement so I took it home. The second time the dealership was closed - I was able to start the car a few minutes later and took the risk of driving home. The next day when I brought it in, I was told that the car was running and that they could not run any diagnosis. Thereafter, the car ran fine for 3 weeks before it happened again. This time I could restart it but the car would only move a few feet before stalling.
The service center has replaced the battery and alternator and say the car has no issues. I had earlier asked the service adviser and service manager
to diagnose the safety issue first before replacing the alternator - otherwise they would not be able to replicate the safety issue. But I have been told that the warnings and car behavior is normal under low voltage conditions. I have also heard inconsistent messages from the dealership that indicates they do not understand or know how to diagnose and resolve this critical issue.
However, no driver should ever lose control of car under any mechanical circumstances. This is either a design (BMW) issue or there is a defect in my specific car that needs to be determined and fixed.
Are there others who had a similar experience and if so how did they address this?