One problem related to wiring has been reported for the 2017 Ford Fusion. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2017 Ford Fusion based on all problems reported for the 2017 Fusion.
My car, with 2k miles, would not start (push button start, this is the plug-in hybrid "energi" model). After being towed to a dealer, they had to tear the car apart to find a bad wiring harness as part of the hybrid system. This part was unavailable, and I am having to wait over 5 days to have the car repaired. In addition, the manufacturer has not provided any alternate transportation and instead tried to get me to buy an extended warranty. Horrible customer support from Ford. This is a safety fix, and the car itself just wouldn't run. To not take care of the customer or have the ability to quickly get a part is unacceptable. Wiring harnesses should not fail in 5 weeks and 2k miles. The car drove one mile, then would not restart. It only complained to "get off the road soon". A failure of what should be a very basic part at 2k miles is concerning, not to mention the inability of Ford to repair it in quick fashion. This does make me wonder if the problem is more widespread and so parts are hard to come by.