Which parts fail
Components named in complaints (engine, cooling system, oil leaks, timing chain, exhaust).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2021 Kia Soul owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2021 Kia Soul. The contact received notification of NHTSA Campaign Number: 21V259000 (Engine) and the vehicle was taken to the dealer for recall repair. The dealer replaced the piston rings; however, the Piston Ring Noise Sensing System (PNSS) software was not updated as it was not available during the recall repair. The contact stated while driving 35-45 MPH, the vehicle stalled inadvertently. There were no warning lights illuminated. The contact turned off and restarted the vehicle, and she was able to continue to drive the vehicle. The contact stated that the failure reoccurred the next day. A warning message illuminated, indicating that the Auto Collision was about to be deactivated. The contact stated that the failure had been reoccurring increasingly and the vehicle failed to restart. The vehicle was towed to the contact's residence. …
We were going south on [redacted] about 25 mph intending to make a left turn onto [redacted] My wife said "slow down or you won't make the turn" to which I replied "I am trying but it won't slow down" As I applied the brakes to slow down to turn, instead the car started to speed up and I could not make the left turn. I continued down the road trying to slow down enough to attempt a left turn on to [redacted] But the car continued to go even faster, so I pumped the brakes trying to slow down and get the car to stop. Instead, the car kept speeding up faster. In seeing I was close to the end of the dead-end road I swerved to the right to avoid the parked Train cars at the end of the road only to crash into the corner of a building which stopped us. At which time I was rendered unconscious. …
The contact owns a 2021 Kia Soul. The contact stated while driving 10 MPH and turning into a parking lot, the vehicle stalled and seized to function. The check engine warning light was illuminated. The contact turned off and restarted the vehicle and the vehicle was able to function as needed. The vehicle was taken to an O'Reilly to be diagnosed. The vehicle was diagnosed with failure in the solenoids, which the contact fixed herself. The check engine warning light remained illuminated, and the contact thought the sensor was faulty. The vehicle was taken to various independent mechanics to be diagnosed and was diagnosed with timing belt failure; however, the contact was informed to first get the vehicle repaired under the recall and then get the timing belt replaced. The vehicle was taken to a dealer and a multipoint inspection was performed. …
The contact owns a 2021 Kia Soul. The contact received notification of NHTSA Campaign Number: 25V099000 (Engine and Engine Cooling); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The contact stated that while driving at various speeds, the vehicle unintendedly decelerated causing the contact to depress the accelerator pedal to continue driving. The contact stated that while stopped at a traffic light the vehicle stalled with the message "Auto STOP Off" and to shift to park to restart the vehicle. The contact stated that the check engine warning light, battery failure, and low oil light was illuminated. The dealer was contacted, and the vehicle remained with the dealer for a month and the contact was informed that the recall repair had been completed. …
The contact owns a 2021 Kia Soul. The contact stated that while accelerating from a complete stop, the vehicle shuddered, and there was an abnormal rumbling and clunking sound coming from the engine. The contact had received notification of NHTSA Campaign Number: 25V099000 (Engine and Engine Cooling), and the vehicle was taken to the dealer, where the piston-ring noise sensing system (PNSS) software was installed; however, the failure recurred and progressively worsened. The contact stated that while driving at various speeds, the vehicle stalled. The contact was able to pull over to the side of the road and restart the vehicle. The check engine warning light was illuminated. The contact stated that the failure persisted, and the vehicle could not be restarted. Additionally, the vehicle experienced excessive oil consumption. …
The contact owns a 2021 Kia Soul. The contact stated that while driving at an undisclosed speed, there was an abnormally loud sound coming from the vehicle with the check engine warning light illuminated. The vehicle idled abnormally rough, and the engine was pulsing. The oil level was checked and was noticeably low. The contact added oil to the engine. The vehicle was taken to Precision Auto Care for an oil change. The contact was informed that the oil level was low. The contact informed the technician that the oil had been recently topped off. The contact was informed of the excessive oil consumption. The contact was provided with information on NHTSA Campaign Number: 25V099000 (Engine and Engine Cooling). The vehicle was taken to the dealer, where it was diagnosed with engine failure. …
The contact owns a 2021 Kia Soul. The contact stated while driving 30 MPH, the accelerator pedal was depressed, and the vehicle failed to respond. There were no warning lights illuminated. The contact was completing a U-turn, and the accelerator pedal was depressed to the floorboard however, the vehicle lost motive power. The contact came to a complete stop while approaching a red light; after the light turned green, the contact depressed the accelerator pedal and the vehicle responded and was driven to the destination. The following day the contact's wife attempted to drive the vehicle; however, the failure recurred, and the vehicle lost motive power. The check engine light warning illuminated. The following day, the check engine warning light illuminated again while the contact was driving, and the vehicle stalled. The contact towed the vehicle to the residence. …
The contact owns a 2021 Kia Soul. The contact stated that the vehicle was experiencing excessive oil consumption. The contact stated that while driving at various speeds, the vehicle stalled on several occasions. The driver was able to pull over to the side of the road as possible, and the vehicle was able to restart after an extended time. There was no warning light illuminated. The contact stated that oil was added every two days to prevent the vehicle from stalling. The vehicle was taken to the dealer to be repaired under NHTSA Campaign Number: 25V099000 (Engine and Engine Cooling), and the dealer deployed the Piston Ring Noise Sensing System (PNSS) software on the vehicle; however, no further service was performed, and the failure persisted. The vehicle was not repaired. …
The contact owns a 2021 Kia Soul. The vehicle was serviced under NHTSA Campaign Number: 21V259000 (ENGINE), but the failure occurred. The contact stated that DTC: P0004 was displayed. The vehicle was taken to the dealer, where an oil consumption test was scheduled to be performed. The contact was asked to provide the maintenance history on the vehicle. The contact was unable to provide the documents, and the dealer refused to repair the vehicle. The dealer reset the code and sent the contact home. The contact stated that on the drive back to the residence, the DTC: P0004 became displayed on the instrument panel. The vehicle was taken back to the dealer. The dealer requested the maintenance records. The vehicle was not repaired. The contact stated that the failure persisted. Most recently, an abnormal sound was coming from the engine, and the vehicle stalled. …
The contact owns a 2021 Kia Soul. The contact stated that while driving at an undisclosed speed, there was an abnormal rumbling sound coming from the engine with the check engine warning light illuminated. The contact had received notification of NHTSA Campaign Number: 25V099000 (Engine and Engine Cooling). The vehicle was taken to the dealer, and the contact was informed that the vehicle failed the inspection test for the recall. The contact was informed that the PNSS software was installed, and the check engine warning light was reset. The vehicle was repaired; however, the failure reoccurred. The vehicle was taken back to the dealer, where it was diagnosed with engine failure. The contact was informed that the engine needed to be rebuilt or replaced. The vehicle was not repaired. In addition, the contact was informed that the engine failure was caused by the recall repair. …
Related recalls
Engine and engine cooling › Engine › Hard parts internal/mechanical
Kia America, Inc. (Kia) is recalling certain 2021-2023 Seltos and Soul vehicles. The piston oil rings may have been manufactured incorrectly, which can result in engine damage.
Remedy: Dealers will inspect and replace the engine as necessary, free of charge. Dealers will also install piston-ring noise sensing system (PNSS) software, free of charge. Owner notification letters were mailed April 4, 2025.
Engine
Kia Motors America (Kia) is recalling certain 2020-2021 Soul, and 2021 Seltos vehicles equipped with 2.0L Nu MPI engines. The piston oil rings may not have been properly heat-treated, which may result in engine damage.
Remedy: Kia will notify owners, and dealers will inspect and, if necessary, replace the engine, free of charge. In addition, Kia will deploy Piston Ring Noise Sensing System (PNSS) software. The recall began June 11, 2021.
NHTSA investigations
Kia 25V099 Piston Oil Ring Recall Effectiveness
On August 6, 2025, the Office of Defect Investigation (ODI) opened Audit Query (AQ) 25001 to assess the implementation of Kia America, Inc.'s (Kia) remedy program for Safety Recall 25V099, involving incorrectly manufactured piston oil rings which may damage the engine causing a loss of motive power or fire.
Engine complaints in other Soul years
Frequently asked questions
How common are engine problems on the 2021 Kia Soul?
NHTSA has 184 complaints about the engine & cooling of the 2021 Kia Soul, 77% of the model year's 238 complaints. The component named most often is engine › crank/camshaft position sensor (2 mentions).
Is there a recall for 2021 Kia Soul engine problems?
Yes — NHTSA recall 25V-099 (hard parts internal/mechanical, Feb 17, 2025); NHTSA recall 21V-259 (engine, Apr 13, 2021). Recall repairs are free at authorized dealers.
At what mileage do 2021 Kia Soul engine problems start?
Half of the complaints with a recorded mileage happened before about 75,000 miles, and 18% before 25,000 miles.
Is it dangerous?
Owners linked 1 crash, 1 fire and 2 injuries to engine & cooling 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.