It may be the case that you are not releasing the brake pedal completely enough for the software to decide to turn the "creep" function back on.
In any case, it's best practice to not rely on the "creep" to hold you on a hill as it consumes power while the brakes do not. There is also a possibility (unlikely though it is) that holding on a steep incline long enough could cause an overheat to be detected, which would result in shutting down the motor...
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Originally Posted by Schwa
There's no real 'neutral' in the PSD/eCVT/HSD/THS systems, the traction motor cannot disconnect from the output shaft/wheels. It's strictly software that takes care of deciding if it should apply power to the motor after you take your foot off the brake pedal. Someone else had mentioned that their FEH would start rolling forward quite fast upon letting his foot off the brake at random times, so I think there's some flakey/buggy programming showing up that Ford has yet to acknowledge and make a patch for.
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