Just want to keep you up to date on some Fiesta news.
Some early production models have a PCM (Powertrain Control Module) bug.
If you battery goes completely dead, in some cases your transmission will not operate properly in D or L gear
Reverse will work, but when you shift into drive or low gear, and press on the gas, it will just rev.
The PCM needs to be re-flashed prior to transmission working.
The reason for this, is to not damage the drivetrain components or electronic power steering. It is a safety precaution.
So, if you battery goes completely dead, and you jump it, and it doesnt drive, call Ford Roadside Assistance 800-241-3673. Your local Ford dealer will address the problem, and re-flash the PCM.
Hope this helps to anyone out there that has experienced it.