Faulty Throttle Position Switch on Kia Optima

Problem Description and Possible Solution

Check Engine Light illumination—combined with a lack of power or a stumble on acceleration—may be caused by the throttle position switch (TPS). Kia released an improved part which should correct this concern.

Problem Data
RepairPal Verified
Average mileage: 94,500 (10,000–271,000)
Exhaust & Emissions affected: 2.7L V6
14 model years affected: 2001, 2002, 2003, 2004, more2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014
103 people reported this problem
Viewing 1 - 20 of 41 problem details
check engine light on...started out as a small stumble while accelerating...now the care stumbles and misfires all the time ...replaced plugs and wires, o2 sensors, gas cap, repair shop cleaned the mfa, check engine light will go out for a few days then another stumble and it will come back on ...be on for a few days with the car running fine then goes off again...now its been on for about 3 days and the car just continues to run rougher and rougher...no one seems to have any idea what to do to fix it
firstly my check engine light came …few week later, my car started loosing power, would get down from 65 mph slowly decreasing to apprx 20 mph… on freeway, i have to pull over to the side of the shoulder of the road.. turn the car off for a couple of min… they start back up.. car gears up fast almost jets off …then same thing couple exits passed. same thing on the streets.
Check engine light came on & car would not go over 15 mph. Shut off & restarted & it was ok. Light came on again. Took to dealership & they replaced the TPS sensor for around $400. 11 months later the same thing happens. Take back to dealership & only under warranty for 12 months or 12,000 miles so i was s.o.l. In the process of getting the sensor to replace then this car is going up for sale....has had several recalls & lots of little but expensive things break or go wrong with it since we purchased it. First & last Kia I will ever own!
Car will not accelerate past 1900rpm. Goes about 20mph and 5 mph uphill. it does this intermittently. Not fixed yet
engine had a hesitation when gas peddle was pushed acted like i had water in the gas, check enging lite came on had it checked /was throttle position switch put on new one now after about 20,000miles it is doing same thing ,had it checked and once again it is the throttle position switch.
Stumbles while idling in gear. Smooths out when I put it in park.
Check engine light came on. My car has slow acceleration and has even shut off when operating. This seems to be a common problem with Kia and they should have to address this and fix this at a reduced cost because it will happen to most of these vehicles.
Faulty Throttle Position Switch Cost $750.00 to fix at KIA.
stubble in aceleration kia opyima 2005
It's not happening every time, but when it does the Kia is accelerating with a delay or it seems like it stutters before accelerating.
Today for the first time we had the Check Engine Light show up for more than just a few seconds. It was on the whole time we drove it this morning and we scheduled an appointment with the dealership, of course by the time we were going to drive there the light didn't come back on!!!

This is the 4th issue with our Kia in less than 14 monthes!!!
This will also be our last KIA ever!
Car jumps at stop signs after taking foot off of brake. Then when accelerating, it acts as though I am flooring it and jolts forwards. Or dies.
The car will not go faster then 20mph.
my 06 Kia Sportage runs very sluggish. it wont pick up speed when you try to accelerate. you can have it on the floor and it wont go over 15mph. I changed the spark plugs and wires, no change. i'm reading that it may be the acceleration position switch, guess that'll be my next thing to change. after that I don't know what to do...
car does not down shift to second gear, i was told it was the output sensor. the price for this part is $110.00 can not afford it at this time.
It seems to be a common failure as I am learning.
Engine light came out. Power loses and takes time to get going.and a little clicking noise. And when in park exhaust is puttering
We've had that part replaced before, but it keeps happening. It occurs 3 or 4 times every 6 months. I began writing it down to show the Service department, but I've been told that if Kia can't "replicate" the issue, they refuse to take action.
Engine elk not go above 2500 rpm, I can shift at that speed with manual transmission, so top speed is 70 mph but getting there is slow. Engine light is on, no diagnosis or repairs yet.
Whether I'm starting from a stopped position, especially pulling into a busy road way, the car will build up to switch gears to accelerate and then power drops off. I have to take my foot off the accelerator and depress it again to get out of the situation. Today, I made a 90 degree right turn, and as I began to accelerate, this happened not once but four times before I got the car to continue moving (happened in a loaner car I have while my car is in the shop). I have had many hear misses pulling into traffic only to have the car choke as it goes to switch into the next gear to pick up speed. It's in the shop now and, surprise, they can't duplicate the problem. They gave me a 2013 optima loaner car, and the same problem is 20 times worse in this car (see 90 degree right turn description above). I can barely move without it happening in this loaner car. What the heck is an owner supposed to do with a car less than a year old when the dealer is telling them they can't duplicate the problem? Are they going to "can't duplicate the problem" long enough to get the car out of warranty so they don't have to pay for a super expensive repair? The problem exists, and if Kia doesn't make an effort to correct it, someone is going to get killed when they pull onto a busy highway, expecting the car to accelerate properly, only to have it choke, and along comes a tractor trailer that cannot stop and boom-they're dead. I hope it isn't me.
Same problem. No solution, other than another repair bill.