I don't think the update will fix all the SSN issues. But is possible it could fix most of them. What concerns me is that some vehicles have never had a SSN and others have had SSN multiple times with no apparent difference between the vehicles. I suspect what Ford is doing is changing the level at which a SSN will occur. So that one random event would not cause a SSN, but rather a sustained fault is required. The fact that some of these SSN don't produce a fault code, does make it harder to track down the root cause of the problem. This often leaves the service tech clueless as to what to do.