One problem related to engine failure has been reported for the 2010 Kia Motor Optima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2010 Kia Motor Optima based on all problems reported for the 2010 Optima.
While driving home one day in December 2015, each time I approached a stop light, yield sign or slowed to a low speed (less than 15 mph), my vehicle would shut-off multiple times. My in motion speed was approx 45 mph when not approaching a stop light or yield sign. It happened both when I was turning and going straight on main roads with 2-4 lanes. The dealership and another asme certified mechanic both state engine failure, which seems to be a widespread problem with 2. 4l engines manufactured by kia and Hyundai around this year up to 2015.