Which parts fail
Components named in complaints (accelerator pedal, throttle, sudden acceleration, cruise control).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2015 Kia Soul owners, lightly cleaned up (personal details are redacted by NHTSA).
Description of Incident: The engine has experienced a failure that causes oil to blow back from the engine, covering components both under and outside of the engine cover. This has resulted in oil accumulating on the exhaust and other hot components, creating a significant fire hazard. Safety Risks: This malfunction poses a serious risk to my safety and the safety of others, as the oil leakage could lead to a fire while driving. Additionally, the vehicle stalls at various speeds, which increases the risk of accidents or harm to other drivers and pedestrians. There is also a strong smell of oil inside the car, potentially indicating harmful fumes entering the cabin. Inspection Availability: The component/system causing the issue is available for inspection upon request. …
The contact owns a 2015 Kia Soul. The contact stated while driving at low speeds and accelerating the vehicle was pulling. The contact stated that while her daughter was driving there was an undetermined abnormal sound detected. There were no warning lights illuminated. The vehicle was taken to an independent mechanic where the contact was informed that the catalytic converter needed to be replaced. The vehicle was taken to the local dealer but was not diagnosed nor repaired. The manufacturer was notified of the failure. The approximate failure mileage was 130,000.
The contact owns a 2015 Kia Soul. The contact stated his mom was driving the vehicle on the expressway at 55MPH. The contact stated that the vehicle did not accelerate and the speedometer was decreasing. The contact stated no warning lights illuminated. The vehicle resummed to perform as normal and the contact drove home. The vehicle was driven to a dealer and diagnosed but not repaired. The manufacturer was not notified of the failure. The failure mileage was 90,000.
My catalytic converter failed just under 4 years after getting the SC176 recall done in July 2020. I believe it's possible there was a step missed in the replacement of my catalytic converter related to the recall, specifically the Catalytic Overheating Protection Engine Control Unit logic that may have caused the converter to fail. I do not detect that on the attached receipt from the repair that was done for the recall. Although there were no safety issues that happened, after reading the recall and what can happen as a result of the catalytic converter failing, I am concerned for my safety if I drive it any longer in that condition. The problem has been diagnosed by my local Kia dealership on Friday 4/19/24 and that is where the car is presently. I have attached the inspection report and the cost to fix it. The vehicle has not been inspected by anyone other the Kia dealership. …
I was driving my 2015 Kia Soul along a 4 lane highway when the Check Engine light came on and begun to flash. The Kia began to lose about 5 mph off and then return to the previous rate of speed a few minutes later. Then it would repeat the cycle. As the vehicle lost the engine power, the steering also became very tight as if the power steering was also malfunctioning. I could also hear a slight tapping sound, as the driver side window was open just a few inches. Since I had my mother whom is ailing with dementia and heart problems, I tried to remain calm and undisturbed by these issues. As soon as I arrived at the closest auto parts store that offered diagnostic readings (O'Reilys), I asked them to see what codes the vehicle was throwing. The codes were P0420 Catalyst System Efficiency Below Threshold (Bank 1) and P1326 Knock Signal Range/Performance. …
Subject: Possible Design Flaw in Accelerator Pedal - Kia Soul 2015 Dear Kia/NHTSA Representative, I am the owner of a 2015 Kia Soul and would like to report a concern regarding the design of the accelerator pedal. I have observed that when the vehicle is turned on and in "Park" mode, the accelerator pedal can be easily pressed unintentionally simply by moving the foot slightly while seeking a more comfortable position. This appears to be related to the low and forward positioning of the pedal, combined with the soft sensitivity of the electronic throttle system. As a driver, I believe this design may lead to unintended acceleration in certain situations, especially if one is not fully aware of their foot placement. There also seems to be no sufficient space to the right of the brake pedal to rest the foot without nearing the accelerator. …
Accelerator is beginning to catch at three distinct points when pressed halfway down or greater. The accelerator seems bent and proceeding in accordance with these recall codes: NHTSA 15V123000 and Kia SC116. These codes are for 2014-2015 Kia Souls manufactured until January 8, 2015; mine is a 2015 Kia Soul but was manufactured shortly after that date. There were no indicator lights related to this issue. Weston Kia in Gresham, OR refused to even examine the issue without a $130 diagnosis, guaranteeing nothing but diagnosis--then I'd pay for parts and labor--despite them being aware of this issue with 2015 Kia Souls. I contacted Kia directly while at the dealer and they refused to cover the diagnosis fee or acknowledge the recall being for the same model year. …
My car started making a loud noise and the car would not accelerate as I was returning home on the highway. I was driving home on I-75 South when my car started to slow down and it was very hard to accelerate and was making a loud noise. I made it to the next exit off Sharonville Rd and made it into a gas station. I opened the hood to check the oil and it was extremely hot and smoking. I had to wait until it cooled off and put in some oil to try to make it on home. The check oil light was not lit which didn't even provide any indication that my car was out of oil during the 1/2 hour drive. I do not feel safe to drive this car, since this incident. I took it for auto repair immediately the next day. Please help with assistance with this issue.
Engine light and ABS light always on, kia hasnt explained this issue or expressed concern about it.. Engine randomly started leaking oil, blowing out white smoke, stalling out upon accelerating causing safety issue in traffic. Kia has had car for 2 weeks now with no answers to resolve. Being told the recall issue is "fine" I use my car for work and this unresolved issue is affecting my livelihood. This all began on 4-29-22 and am now being asked to pay for further testing for diagnostic purposes. Told there are no loaner vehicles and to rent one at my own expense.
Acceleration system/ on highway at high speeds It stay accelerating at very high rpms as it shifts into the next gear and it is consuming a very large amount of fuel at the same time. It is available for an inspection. It has not been inspected by anyone. While driving on the highway at high speeds I felt it was putting my family and myself at risk of crash or engine failure or being stuck on the side of the highway.
Related recalls
Vehicle speed control › Accelerator pedal
Kia Motors America (Kia) is recalling certain model year 2014-2015 Soul and Soul electric vehicles manufactured July 21, 2013, to January 8, 2015. A section of the accelerator pedal may bend and fracture.
Remedy: Kia will notify owners, and dealers will add a supporting rubber underneath the pedal stopper, free of charge. The recall began on March 24, 2015. Owners may contact Kia customer service at 1-800-333-4542.
Acceleration complaints in other Soul years
Frequently asked questions
How common are acceleration problems on the 2015 Kia Soul?
NHTSA has 30 complaints about the speed control & acceleration of the 2015 Kia Soul, 3% of the model year's 902 complaints. The component named most often is accelerator pedal (2 mentions).
Is there a recall for 2015 Kia Soul acceleration problems?
Yes — NHTSA recall 15V-123 (accelerator pedal, Mar 2, 2015). Recall repairs are free at authorized dealers.
At what mileage do 2015 Kia Soul acceleration problems start?
Half of the complaints with a recorded mileage happened before about 95,000 miles, and 25% before 25,000 miles.
Is it dangerous?
Owners linked 2 crashes, 2 fires and 6 injuries to speed control & acceleration problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.