Kia Motor Optima owners have reported 2 problems related to transmission sensor (under the power train category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Kia Motor Optima based on all problems reported for the Optima.
Recently when I hit about 103,000 miles my 2011 kia Optima 2. 0 turbo transmission has been acting strange. When driving for a little while and coming to a complete stop as I'm pulling off accelerating the car jerks make and won't accelerate past 40 mph. After doing acouple research I was told it's the transmission temperature sensor. I. Believe this is a serious problem due to the fact as your pulling off after the complete stop it jerks so hard you jerk so hard with the car. Also if anybody is behind you and it does that sudden jurk it can cause an accident because the driver behind you isn't aware because it's not like your hitting the breaks. I also searched online that this model and year car has two open recalls for engine and transmission problems (unknown).
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all problems of the 2011 Kia Motor Optima
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When putting the car in gear, it would jerk really hard like I had hit something. At first it only did it once or twice within a month so it was hard to duplicate. Recently it started getting consistent. It would jerk hard when putting it in gear or park. Also going down the road it shifted really had like something was slipping. It didn't matter if it was in the morning or afternoon. Twice this week, it did it each time I went somewhere. The shifts were sometimes shorter and more often. It felt like it was maybe slipping or needed fluid. I took it in and determined it was the transmission temperature sensor. They replaced trany temp sensor, code p0711. There was no code on the dash, they had to check it in the transmission. It worked.