Accelerator Position Switch May Fail and Cause Sluggish Acceleration on Kia Amanti

Problem Description and Possible Solution

The accelerator position switch may fail intermittently resulting in sluggish acceleration or lack of power.

Problem Data
RepairPal Verified
Average mileage: 103,405 (11,200–288,000)
Engine affected: 3.5L V6
5 model years affected: 2004, 2005, 2006, 2007, more2009
75 people reported this problem
Viewing 1 - 20 of 48 comments
It has never been fixed. Car wont accelerate when the weather is hot over 85 degrees . It has done this for last 3 years. Have had in and out of dealer and they can't get it to do the problem!!! this is an ongoing problem for the last 3 years every summer only on hot days. Last week drove about 22 miles nothing happened drove home after shopping for 1 hour left to come home and took over 1 1/2 hours to go 22 miles car wont accelerate. Stop let sit 15 to 20 minutes then can go again for few miles then it does it over and over again.
Drove today 75 miles one way no problem. Let car cool 30 minutes headed home and went about 30 minutes car would not accelerate again died. Let car set for 30 minutes drove again in stop and go traffic and it went about 2o miles happened again and again at least 6 more times before making it home. Quite tired of this worth less car.
car would not accelerate it would just get stuck at about 2000 RPMS
same as everyone else. Car drops to idle and no throttle control. Car wont do over 10 mph. let it sit and it will start and drive fine. But keeps doing it. dangerous as heck. Scared to keep driving it.
Same as others. During cold temps, car will idle, accelerate, and generally be dangerous. Sometimes, get stuck at 2000 rpm. Then, pressing the brake will kill engine. Happens during cold weather predictably. Sucks.
sluggish, sometimes cuts off. no rpm movement
Kia 2007 rio car will not accelerate
I have an '05 Amanti which I've sent to the dealer, I've replace the Accelerator pedal position sensor, the throttle position sensor but the problem still persists. I did notice recently that the issue becomes worse in warmer weather. Through some research I've noticed that the issue is probably due to faulty wiring in the wiring harness, but the harness is huge...and the dealer wants over a grand for the harness alone.
Throttle Position sensor has low voltage on check engine code. Occurs after engine heats up and about every 3 day. Headed ti the parts store thanks to repair pal.
I have had the same problem as the others and have forked over thousands of dollars in repairs. KIA kept telling me it was one thing and charging me to fix it, only to have the same problem occur. They play ignorant when I addresses others experiencing the same. Took my money and could really care less. This is a dangerous problem that can result in a serious accident and all they care about is getting their money.

I will never purchase a KIA product again. Unfortunately, since I have poured so much money into the car I am stuck with it until I can save enough to to purchase a new one.

One tip, disconnect the battery and re-connect and I am able to drive 50 miles or so. Though, when the temperatures rise this happens more often. ADVICE TO OTHERS NEVER BUY A KIA!
"Check engine" light on. Diagnostics pointed to the acceleration position switch. Replaced at a garage. Kia dealer's estimate was 4X my mechanic's price.
Check engine light came on, now its driving sluggish.
The car is giving me problems of acceleration and at time would turn on but shut off right away. Taking off was the major problem as the car has a though time picking up speed, in addition, it does not get up to proper highway speeds.
At about 40MPH, it wants to chug, until you give it more fuel. Annoying as hell...KIA dealer said it had something to do with over-filling the gas tank, and a charcoal filter? That diagnosis, and supposed fix, ran $900. Off their lot, doing the same thing...mind you, we had not filled the tank since driving away.
Dealer wanted more $$ to try to fix; no way, as we had seen the posts about this; they claimed ignorance about an on-going problem. Asked for any consideration regarding our $900 outlay-no way!!
Have lived with the problem for 23K miles now; forget KIA service!! And, tho we love the car for everything else, probly won't buy another KIA.

By the way, both front window motors went out within two weeks of each other recently. I'll fix those myself, thank you
I had the same issue happen yesterday that others reported. Pulled out of the driveway and car wouldnt accelerate any faster than 10-15mph/felt like it was going to cut off. I had the car towed to a shop and they stated that it was "short in throttle wiring" and therefore repaired the wiring and "cleaned gunk" from the throttle. My check engine light and airbag light had also been on MONTHS prior to the car dying yesterday.

It seems to be working fine now that they've replaced the wiring, but I'm a little nervous after reading the other comments from owners having the same issues! Hope they've fixed whats truly wrong with it.
I feel when i go uphill the acceleration glitches
I had this problem with this accelerator pump sending unit, the car wouldn't start and only when I was lucky, was stranded many of times due to this problem. I spent lots of money. Only to find out the KIa dealer could Not guarantee their own work. Nor figure out this problem. Crazy we had No alternative but to except the Substantial loss of our Favorite Car (2006 Kia Amanti)..
On start up fast idle, with loss of accelerator pedal control. motor surges on idle. Had car scanned with obd 2, code related to throttle motor.
In summer, very hot day in ABQ, air conditioning on, engine lagged on major street as I floored acceleration. I had stopped. Parked. Idled. Stopped more than normal that day. Fearful, I got 2006 kia amanti to a safe place, parked. And waited. It did get loggy again, but not as bad. Could not re-create conditions for mechanic. Yesterday, acceleration surged!? Luckily, at a red light. I applied the brake but car wanted to GO! I pressed the brake harder, shifted to park, then shut the engine off. It was normal when I restarted. Had a feeling this was abnormal.
Its never been 100% fixed and the throttle body also fails intermittently. The throttle body can be "fixed" with an at home job but will happen again.
Computer intermittently goes blank. Car boggs down. Accelerates while brake is depressed at stop lights. replaced pedal position sensor. No help. Next will replace gas pedal sensor. Then may reflash computer.