Faulty Throttle Position Switch on Kia Optima

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.

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Average mileage: 90,385 (10,000–271,000)
Exhaust & Emissions affected: 2.7L V6
13 model years affected: 2001, 2002, 2003, 2004, more2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2014
101 people reported this problem
46 people shared problem details
2003 Kia Optima119,000
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
2006 Kia Optima121,000
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.
2007 Kia Optima79,000
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.
stubble in aceleration kia opyima 2005
2006 Kia Optima94,000
Faulty Throttle Position Switch Cost $750.00 to fix at KIA.
2007 Kia Optima64,000
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.
2001 Kia Optima271,000
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.
2010 Kia Optima59,860
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!
2003 Kia Optima150,000
The car will not go faster then 20mph.
2005 Kia Optima70,849
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.
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...
2002 Kia Optima102,000
Its got a rough idle and at 2500 rpms acceleration stumbles down and up
2002 Kia Optima169,000
Bought this car a few weeks ago and it was not cared for. It has run rough, stalling, and sputtering since we bought it. We replaced the mass air flow sensor and it was no better. Replaced the throttle position sensor and it got worse! Changed a fuel injector that we were convinced was bad, nope! So ... when all else fails, something you read somewhere comes to your mind. Hmm... maybe I should try gapping the spark plugs to 0.028 and wow, imagine that. The car sounds amazing. Crossing our fingers that we are on our way to a functional car.
2012 Kia Optima49,000
It all started about 3 weeks ago when I put on a different exhaust system. Engine shaking real bad like it has no fuel. Also the exhaust has been spuddering and back fires right around 2000rpm. From about 1500 to 2200 rpm it runs horrible then it runs better at high rpm. Also in reverse it gets worse. I just bought it in September. From carmax. FYI after I put on exhaust system it was fine for 3 month's so I'm unsure of what is going on and I'm a mechanic.
2005 Kia Optima83,087
Left car sitting for two days in driveway, didn't move, weather unseasonably warm, occasionally rainy, average 70 degrees outside in winter. Started car, but kept in park. After 90 seconds car began to stumble without acceleration. Applied acceleration, car's stumbling became more pronounced. Took it for a ride through the neighborhood, not topping 25 mph for approximately half a mile, stumbling became more pronounced but was intermittent. Went back to driveway, had someone ride with me through the neighborhood, stumbling was a little less pronounced. Stopped to turn around and then upon accelerating again engine light flashed on very briefly then cut off right after car stumbled very dramatically. Car seemed to hesitate. Drove back to driveway cut engine off. Waited 3mins. Started car up again, revved engine, it stumbled a few times, but less than before. Turned the car off again, and waited 3 more minutes. Started car up again, revved up to 2000, engine sounds fine now. Unable to duplicate again to show mechanic. Will have to wait.
2005 Kia Optima88,000
Bumper to bumper traffic car shook a little and engine light turned on. Acceleration had been effected.
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