One problem related to software has been reported for the 2012 Hyundai Accent. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Hyundai Accent based on all problems reported for the 2012 Accent.
Around 50000 miles the car would over rev about 1000-2000 rpm when the clutch was released and foot off of the gas. It has progressively gotten worse. Now it will on its own while standing at idle run up to 5000-6000 rpm without warning and the only way to stop it is to turn the car off. When in gear, the car will accelerate without warning. If you depress the clutch, again it will run up to 5000-6000 rpm. The problem becomes exacerbated in warmer weather and lessened in cold weather. During the 12/24 heat wave here in PA, the car was undriveable and dangerous as I could not depend on it not "taking off". The dealer updated the software on 12/22 which did not resolve the issue, and no codes were found in the computer! before 50,000 miles everything was fine.