Fail-safe Mode
WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
Because both SSE and SSB apply the clutches they control when they are turned OFF, 5th gear is the fail-safe. This transmission defaults to 5th gear when certain failures are detected. 5th gear is provided hydraulically with no electrical input.