Just took the 99 Burban in for a free scan. These codes all of a sudden popped up. I just purged a bunch of codes due to a simple blown fuse. Now these speed sensor codes all popped up. Seems like something bigger than one speed sensor. Another fuse? Actron Website says these codes are ABS system related. All of a sudden speed sensors are no longer communicating ????? Whats up with that? Let me know if you have an idea.