When the brake pedal is pressed on the brakes will grab. It snatches the car kinda hard. Also when you give the car gas it will hesitate and will not accelerate. Another with the gas is that you can be driving at a higher speed such as 45 to 55 or so and you press down the gas pedal like your going into passing gear and it will not accelerate it’s like it’s trying to stop. Feels like the car is gonna fall on down onto itself and it loses power.
2012 Kia Optima acceleration problems
40 complaints (4% of all complaints for this car). Typical mileage when it fails: 74,000. 1 crash reported.
- owner complaints
- 40
- of this car's complaints
- 4%
- typical mileage
- 74,000
- crashes
- 1
- recalls
- 0
Which part fails
Owners did not name a specific part.
At what mileage
Complaints by mileage at the time of the problem.
0k-25k
25k-50k
50k-75k
75k-100k
100k-125k
125k-150k
150k-175k
175k-200k
200k+
Kia Optima acceleration problems in other years
Specific symptoms reported on the 2012 Kia Optima acceleration
Phrases found in the owners' own descriptions, so one complaint can mention several symptoms.
Related recalls
No recalls on record for this model year.
Related investigations
Throttle control system vulnerabilities
The Office of Defects Investigation (ODI) of the federal safety agency received a petition letter dated October 10, 2021, requesting an investigation of possible defects in the electronic throttle control (ETC) system on certain Kia vehicles resulting in the opening of DP21-003. Accordingly, Model Year (MY) 2005-2016 Kia Optima/K5, MY 2006-2015 Kia Sorento, MY 2007-2016 Hyundai Elantra, MY 2007-2016 Hyundai Santa Fe, MY 2006-2015 Hyundai Sonatas are all part of the subject population. The petition was originally filed as a Vehicle Owner Questionnaire that can be reviewed at under reference (ODI) number 11439675.On November 12, 2021, ODI opened Defect Petition DP21-003 to evaluate the petitioner?s request. ODI performed trend analyses of the VOQs related to vehicle speed control issues for all the subject vehicles and found that none of the 52 Model/Model Year Hyundai/Kia vehicles demonstrated any actionable trend that warranted an investigation.Petitioners submitted 1119 VOQs and non-VOQ cases in which sudden uncommanded acceleration (SUA) or loss of motive power (LOMP) incidents were alleged.For the 1119 reports, 220 were incidents involving crashes, from which 69 subject Hyundai-Kia vehicles were inspected by Hyundai/Kia dealer technicians, Hyundai/Kia engineers, and/or third-party representatives.ODI found the inspections identified no vehicle defects related to the ETC system.Of the 220 crash-involved reports, 13 Event Data Recorder (EDR) records were downloaded successfully and 11 of those indicated driver error: (i.e.) pedal misapplication.A condition where the accelerator pedal is mistakenly applied instead of the brake pedal when the driver wants to stop the vehicle.In addition, ODI reviewed a scientific journal paper published in Forensic Science International in 2016 by Mr. Park et al ., as well as related test videos. ODI does not believe there is any evidence of uncontrollable SUA occurrences in any of the tests reviewed. the federal safety agency's Office of Vehicle Safety Compliance (OVSC) reviewed the allegations regarding the potential noncompliance with Federal Motor Vehicle Safety Standard No. 124.Based on the information provided, the Agency concludes there is insufficient information for us to determine if a possible non-compliance exists.Finally, both Hyundai and Kia informed ODI that all their vehicles manufactured after 2012 were equipped with an ETC management system, in which the engine speed will go to idle when the system sees signals from both the brake pedal and accelerator pedal at the same time; this is commonly known as the brake-throttle override system.After thoroughly assessing the material submitted by the petitioner, information already in the federal safety agency's possession, information submitted by Hyundai and Kia in response to an Information Request letter, and the potential risks to safety implicated by the petitioner's allegation, the federal safety agency does not believe that a formal investigation is warranted. After full consideration of appropriate factors, the petition is denied. A Federal Register Notice (FRN) further detailing the federal safety agency?s reasons for denial of the petition will be published.
DP21003
What 2012 Kia Optima owners say
Most recent owner complaints, unedited.
While in park and driving the instrument panel will show, "Check Brake" and "Hybrid System Warning! Safely Stop and Do not Drive". This is accompanied by the engine not responding to the gas pedal. The brake pedal will also loose pressure and once pushed the brakes will lock up making a grinding noise. The problem has not been able to be duplicated by the dealer. However there are multiple forms and online communities dedicated to try to resolve this issue since it's so prevalent. This issue causes a major saftey hazard as the car comes to a grinding halt and does not respond to the driver. From online sources it seems the problem is prevalent across years and models and only tied to hybrid vehicles.
Because the brake stopper or brake switch are messed up and my brake tail light stays on all night causing it to drain the battery If the car is braking while I’m driving it and the traction control light comes on and the speed is decreasing as I’m driving because the car is braking on it’s own it has nothing to do with the lights Nor the battery the root of the issue is the brake line because the tail light will not cut off because the brakes are still engaged even when the car is off causing the tail lights to stay on so the lights is what is draining the battery the lights stay on all night in a car the battery dies but the battery nor the lights is the issue it’s the brakes
Here I explain the problem better, when the car is at a low speed, such as when parking, the gasoline engine starts and it starts to rev up to 6k RPM and after that it brakes and hits hard, this would be dangerous on the highway and another problem is that when accelerating it has a delay of 1-3 seconds, and I want to report this problem to see if there is any solution
My airbag light is on and I have no power to my steering wheel controls including my horn.
Brake pedal stopper breaking apart causing the ESC indicator to come on and loosing acceleration while driving. I contacted dealer and no recall on th.is issue.
The contact owns a 2012 kia optima. The contact stated that while driving on the highway, the vehicle failed to accelerate above 45 MPH. There was white smoke beginning to come from underneath the hood of the vehicle and the exhaust. The contact stated that it had gotten to the point where they would have to add oil to their vehicle every 100 miles. The check oil warning light would illuminate intermittently. The contact took the vehicle to the dealer (valley hi kia 14644 valley center dr, victorville, ca 92395; 877‑305‑9865). The vehicle had too high levels of the oil. The contact took the vehicle to a certified mechanic who changed the oil and changed the crank sensor. The contact was told that rod barring material was found in their oil. The vehicle had not been repaired and the failures persist today. The manufacturer was not made aware of the failure. The approximate failure mileage was 129,000.
Tha car shut down in the middle of the road would not start all lights came on and could not steer gave the car gas on gas pedal nor could I brake to get out of the road. Has been towed to demontrond kia to see if under warranty for repairs almost lost my life on highway
Car will not start up. When turning key I hear clicking noise from under the god from fuse box and thinking it's starter relay but I replaced it and still nothing eventually by keep trying turning key to start for 18 minutes it starts up finally. No clue what it could be. Maybe starter solenoid
Tl* the contact owns a 2012 kia optima hybrid. The contact stated that the vehicle experienced electrical failure and unintended acceleration. The contact stated that the vehicle accelerated and decelerated independently. The contact stated that there was an intermittent failure with headlamps. The contact also stated that the vehicle lunged forward while driving. The vehicle was taken to power kia dealer, (3705 market st ne, salem, or 97301, (503) 585-7333) and was informed that the battery needed to be replaced. The vehicle was repaired however, the unintended acceleration recurred. The vehicle was taken back to the same dealer and informed that the headlamps light switch caused the battery to drain. The battery was replaced. The vehicle was repaired. The failure recurred. The contact stated that the vehicle was taken to the same dealer four times. The manufacturer was not made aware of the failure. The failure mileage was approximately 77,874.
Questions about the 2012 Kia Optima acceleration
Does the 2012 Kia Optima have acceleration problems?
Owners have filed 40 complaints about the acceleration of the 2012 Kia Optima, 4% of all its complaints.
At what mileage do 2012 Kia Optima acceleration problems start?
The typical (median) mileage in owner complaints is 74,000 miles.
Was there a recall on the 2012 Kia Optima acceleration?
There is no recall for this problem on this model year.
What year does the Kia Optima have the most acceleration problems?
The Kia Optima model years with the most acceleration complaints are 2012 (40 complaints), 2013 (39 complaints) and 2015 (36 complaints).
Other 2012 Kia Optima problems
Engine 418Steering 188Electrical 123Brakes 88Fuel system 54Transmission 54Airbags 48Body 39Lights 32Visibility 28Suspension 18Driver assistance 12Seats 8Wheels 8Tires 7Seat belts 5Locks 2
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