2011 Kia Optima Hybrid: hesitation when accelerating

Filed Apr 27, 2019 · Engine · 130,000 miles · KY

My active air flapp system is defaulting and transmission going out. Not to mention the hesitation when accelerating

Filed Apr 15, 2019 · Engine · 148,000 miles · MD

Took my car to the dealer in camp springs, maryland to have an analysis done and to install a new air bag recall from dmv. One of the issues was to check my fluids and to see why my car hesitates and makes a clanking noise after driving a period of time. Now, it didn't happen all the time. Just when it was driven for a few hours straight. One of the dealers service rep reported that the engine was burning oil. After reading the report, I would constantly check the oil. When I first notice the clacking noise, I would check the oil. There was plenty of oil in the car, however, my coolant container was low. Purchased coolant for the vehicle. A month later, the container was almost empty again. Apparently, the coolant was leaking into the engine. Now I have an engine problem.

Filed Jun 23, 2014 · Acceleration · 21 miles · AZ

Tl* the contact owns a 2011 kia optima hybrid. The contact stated that while accelerating from a complete stop, the vehicle hesitated and suddenly accelerated. The dealer could not diagnose the cause of the failure. The failure occurred at various low speeds. The manufacturer was not notified. The failure mileage was 21. Updated 8/11/14

Filed Nov 27, 2013 · Engine · 24,101 miles · PA

While accelerating from a dead stop, the car hesitated and stopped until it appeared to shift from electric to gas power. I thought at the time that it may have been a freak thing but this hesitation has recurred a few times since then.

Filed Nov 8, 2012 · Electrical, Engine · 100 miles · NY

When applying gas pedal to pull away from a dead stop--such as a stop sign or red light---car stumbles and hesitates. At times car will not even respond when gas pedal is pushed. Push the gas pedal and nothing happens--then you push pedal a bit more and it jerks and shoots forward. Not a comfortable situation when trying to pull into traffic from a intersection. Happens virtually every time. Cold or warmed up--same problem--except a lot worse at cold start. Once above 30 mpg things smooth out--but the big danger is trying to pull out into traffic. I have been to the dealer several times. They do a re-flash or whatever--then tell me it drives normal. No fault with the dealer at all--they have been excellent really--but--can't fix the hesitation.but driving normal--that's not true. They know they have a problem with this hybrid system--there is a web page that addresses this problem---everyone has the same problem. I can't even allow a friend or one of my kids drive this car.if you don't know how the cars going to react---your open to a serious accident. I have had a camry hybrid and two prius hybrids--no problems. I know how a hybrid car should drive. This car is unsafe for the driver and other mortorists on the road. [xxx] information redacted pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6).