really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
78,535 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2006 Kia Optima engine problems

engine problem

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2006 Kia Optima Owner Comments

problem #7

Sep 102016


  • 103,083 miles


"first" time problem happened was July 3, 2016 with my 2006 Kia Optima. I was sb on hwy I25 in cs, co. Speedometer read 25mph as I was coming off the on-ramp. I accelerated to 40mph into flow of traffic. I felt a lurch & the vehicle automatically accelerated. Speed went from 40mph to about 60 mph without depressing accelerator. Breaking did not slow it down. I felt car was going out of control. My passenger reached over & turned ignition switch off & on quickly, to decelerate & accelerate. This helped car slow down when key was turned off to the first click & helped maintain an adjusted speed as traffic was in-front & in-back. We kept doing this until car slowed down enough to pull over to right shoulder. Key was completely turned off & car was at a complete stop. Car was towed to mechanics. Diagnostic was performed using engine analyzer. It was road tested multiple times & didn't it duplicate my experience. This happened again Sept.10, 2016 as I, again, entered hwy I25 so.I was driving alone. My speedometer was 40 mph, in heavy hwy traffic. I once again "felt" lurch of car. This time it "stuck" at 40 mph. It didn't slow down when I braked, it continued at 40 mph. I continued to brake & speed did slow a bit. My foot was totally down on break when it was still auto accelerating at the hwy exit ramp; now slowed to 26 mph as I continued holding brake down. Finally speed was down to 23mph as I drove into a parking lot (no cars were moving in & out at the time). I turned the key off completely; my foot was still on the brake & the car came to a lurching haul at that time in the middle of the parking lot. I waited about a minute & then started the engine again with my foot on the brake. I was able to pull into a parking slot. I started it & very slowly drove home, but not on the hwy. I maintained speed of 25-30mph. It was only about 1K between the 2 incidents.

- Colorado Springs, CO, USA

problem #6

Jun 072016


  • 44,700 miles
Pulling out of my garage my car accelerated out of control at high speed backwards across the street into the side of my neighbor's house taking her electrical box, sprinkler motor and A/C unit down. The wire's were hot and I was advised to stay in the car until the firefighters arrived and the power shut down by the power company - scared to death of a fire or electrocution.

- Palm Harbor, FL, USA

problem #5

Oct 252014

Optima 6-cyl

  • 66,961 miles
I went to go shopping, and at the second stop sign in my neighborhood I stopped. When I tried to drive the gas pedal when pushed would not let the engine go fast enough to go above 20 mph, then I noticed that the check engine light was on. I pulled over and checked my engine and its fluids, could not find any thing wrong. So I started the car up again, and everything seemed to work fine. So I drove off and the car worked like it should have. I then went to a auto parts store, and they used their meter to check engine codes. The code was P2135, code definition: Throttle pedal/position sensor 'A/B' voltage correlation.

- Callaway, FL, USA

problem #4

Nov 012011

Optima 6-cyl

  • 75,000 miles


Driving down interstate and the car acts like im not giving it has I have to pull off road and cut off car and wait to restart sometime it clears up and sometimes it doesn't. sometimes it will do ok after restart and other to times it may go couple miles and do it again. Also my trunk latch doesn't work even when you try to pull the emergency open in trunk. My sister had same problem with her 07 Optima.

- Dalton, GA, USA

problem #3

Jan 152013


  • 111,000 miles
The contact owns a 2006 Kia Optima. The contact stated that after fueling, the vehicle failed to start. The vehicle was taken to the dealer for diagnosis. The technician stated that the throttle and the accelerator pedal would have to be replaced. The manufacturer was made aware of the failure. The vehicle was not repaired. The approximate failure mileage was 111,000. The VIN was not available.

- St Petersburg, FL, USA

problem #2

Oct 112010

Optima 6-cyl

  • 79,000 miles
My Kia Optima accelerator sensor went out about a week ago. It would not go above 20 miles an hour. I turned the ignition off and restarted it. When I did that, it took off like a jack rabbit without even touching the gas pedal. Dealership towed it for repairs. They said it was dangerous to drive. It was determined to be the accelerator throttle sensor. The defect was repaired and no further incidents have occurred to date.

- Jacksonville, AL, USA

problem #1

May 222010


  • 70,000 miles
The contact owns a 2006 Kia Optima. The contact attempted to drive the vehicle after a cold start, the contact noticed that the vehicle would only accelerate at a very low speed and that the RPM's would not increase over 2000. The vehicle was taken to a local mechanic who stated that there was a loose connection on the throttle body or that the throttle body needed to be replaced. The vehicle was not repaired. There were no prior warnings. The failure mileage was 70000 and the current mileage was 73000.

- Houston, TX, USA

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