One problem related to brake light on has been reported for the 2016 Ford Fusion. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2016 Ford Fusion based on all problems reported for the 2016 Fusion.
The stoplight switch, which turns on and off the brake lights, is activated by a rubber grommet/bushing/pad which is inserted into a hole on the brake arm assembly. Over time, this part deteriorated and broke into little pieces and fell out of place. Without it in place, the stoplight switch does not function properly, and the brake lights are constantly on. The vehicle is only 2 years old and has less than 40,000 miles on it. It is unknown when this occurred, however it was noticed when the vehicle was parked. Further yet, Ford does not offer this bumper as a spare part, nor do they even know the part number, forcing me to retrofit the vehicle with an aftermarket part. I would assume the thickness of the pad is critical to reliable brake light operation, so I will be forced to make a risky modification.