One problem related to automatic transmission cooler has been reported for the 2012 Ford Fiesta. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Ford Fiesta based on all problems reported for the 2012 Fiesta.
I bought my 2012 Ford Fiesta in 9/2015 with approx. 16,000 miles on it. Since I purchased the car, it has been in the shop 5 times (one of which for 26 days). #1 was due to the door latch. My 10yr old was sitting in the backseat when the right side door swung open while I was making a turn. #2 was due to the transmission. The car was having trouble shifting gears & began shaking, then the lights inside & out started blinking and the car completely shut off while I was driving down the highway. #3 was for the transmission again, which locked up while I was driving down i75 in naples the evening of 12/28/2015. The car completely locked up and had to be towed in the middle of the night. #4 the transmission again. While driving north on i75 the car started making a strange whinny noise then shortly after locked up while I was still driving. That time I barely made it off to the side of the highway. Car was towed again to dealership. #5 transmission. . . Again. While driving at 11:30pm at night 8/2016 car lights started blinking on & off and then the car completely shut off while I was driving. Managed to be able to turn it on again and drive it to the dealership. . . Where it stayed for 26 straight days. Tomorrow will be #6. . . Due to transmission problems. . . Again. Car is making whinny noises again, shaking and having trouble shifting gears, temperature light is coming on and a/c is not cooling anymore. Itomorrow I'll be getting an attorney as well.