2021 Kia Soul: misfire or rough idle

Filed Jul 3, 2026 · Engine · TX

Vehicle: 2021 Kia Soul LX, 2.0L Engine Subject: Loss of Motive Power and Stall While Driving Under Recall SC336 Description of Incident: On 07/02 @ roughly 6:15PM, while driving on the highway I-35E at approximately 60 MPH, my vehicle's engine experienced a sudden and complete loss of engine power, stalling while in motion. I was able to safely navigate to the shoulder, activate my hazard lights, and restart the vehicle after pulling over. This stall occurred despite the vehicle being covered by Recall SC336 for defective piston oil rings . The recall condition explicitly warns that engine seizure can result in "loss of motive power," creating a significant risk of crash or injury. Ongoing Symptoms (Documented): · Excessive oil consumption: Over 2.5 quarts low after approximately 1,000 miles since the last oil change. This aligns with the recall's "increased oil consumption" warning. · Audible engine knocking when shutting off and ticking during acceleration. This matches the "abnormal noise from the engine" described in the recall. · Active Diagnostic Trouble Codes (DTCs) stored: P0017, P0014, P000B, P0172, P0300, P0301, P0302, P0303, P0304. These indicate timing issues, misfires on all four cylinders, and oil pressure-related failures. Vehicle had similar codes when visited for recall February of this year. Was told everything looked fine. · The vehicle shows signs of instability when accessories (A/C, headlights) are engaged, suggesting the engine is struggling to maintain idle. Safety Risk: The vehicle is unsafe to drive. The stall on the highway presented an immediate crash risk due to the sudden loss of power, which also disables power steering and power brakes.

Filed Jun 16, 2026 · Engine · TX

My vehicle has been in the shop 7 times for misfire in all cylinders over a 2 1/2 year span Kia dealer refused to replace the engine, 8 months after I threatened to sue the dealership for saying they fixed the misfire in all cylinders issue and 8 months later I’m getting misfire in 4th cylinder. As the engine light came on again and I have a high end car diagnostic tool attached to the car which is giving me that code and previous codes of misfire in all cylinders. First misfire in all cylinders started at 16,000 miles bought car brand new and it continued all the way to 37,067 miles . The Kia dealership keep saying it’s this or that and it’s been fixed but the lights come on the previous 7 times after a week or less after taking it home from the dealer and then saying it’s fixed last time I wanted a new engine a Kia representative said it doesn’t need a new engine. I talked to a technician there about reading about this issue in alot of same vehicles he said I was right but Kia doesn’t want to pay for a new engine so they give excuses or just reset or clear the codes which doesn’t resolve the problem , Kia has changed the fuel tank, changed the spark plug wires, the spark plug cables the assembly,ecm which never resolved the problem

Filed Jun 15, 2026 · Engine · CA

I took my 2021 Kia Soul to the dealership for a piston ring recall; they ran their standard test and said it passed, but my car is still showing a misfire fault. I replaced the ignition coil, spark plug, and fuel injector, yet the problem persists. I’ve taken it back to the Kia dealership twice, but they refuse to inspect it because it already passed their test.

Filed May 19, 2025 · Driver assistance, Engine · WV

I own a 2021 Kia Soul that was serviced under recall SC060, which involves inspection of the piston oil rings for potential defects. The recall service was performed at an authorized Kia dealership on May 12th, and I was informed that the engine passed the inspection and was operating properly. However, on [XXX] after the recall service was completed, I noticed oil deposits on my spark plugs. Upon removal and inspection, the spark plug tips (combustion side) show clear evidence of oil contamination, which suggests that oil is entering the combustion chamber—exactly the type of problem SC060 was meant to address. My car is definitely damaged, and my recall passed the inspection. That doesn't make sense. Kia Dutch Miller didn't give me proof of inspection of my car; they only gave me the invoice for the work done on the car. I have photo evidence of the oil-contaminated spark plugs, and I am concerned this may lead to increased engine wear, misfires, or even total engine failure. Please investigate whether recall SC060 is being resolved properly by dealerships, and whether additional remedies or extensions should be provided to affected owners like myself. My car hasn't been fixed yet. Vehicle VIN: [XXX] Mileage at time of recall service: 41,365 Date of recall service: [05/12/2025] Location of dealership: Dutch Miller, South Charleston, WV Thank you. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Apr 14, 2025 · Engine, Transmission · OH

I dropped off my 2021 Kia Soul at the dealership where I purchased it to address a nationwide recall, which states: “The piston oil ring(s) may have been incorrectly manufactured, potentially damaging the engine cylinder wall. This can lead to increased oil consumption, abnormal engine noises, engine seizure, and possible fire from oil leaking onto hot exhaust components. Loss of drive power and/or fire increases crash and injury risk.” My vehicle has shown multiple symptoms, including rough running, significant shaking, illuminated check engine and oil lights. On 01/02/23, I brought it in, but the dealership found no stored codes and took no action. On 04/20/23, a code for a cylinder 1 misfire was found, but because the issue wasn’t present at that moment, no repairs were made. On 10/05/23, spark plugs and fuel pump were replaced under warranty. No further issues occurred until 02/14/25, when the same symptoms returned. I was told I’d be charged for a diagnosis and they likely wouldn’t find anything, so I left without service. On 04/09/25, the symptoms reoccurred. I dropped off the vehicle on 04/10/25 and paid out-of-pocket for a rental until 04/14/25. On 04/14/25, after being told earlier that work couldn’t be done because the engine hadn’t cooled to 55°F, I was later told the recall was completed and the vehicle was safe—despite ongoing issues. I fear for my safety and the safety of others. I believe my vehicle needs an engine replacement and is unsafe to drive. The recall letter states inspection and software update should take 1–2 hours, and engine replacement 8+ hours. I request further diagnosis and repairs. Despite the vehicle continuing to show symptoms, I was dismissed. I am seeking accountability and proper resolution.

Filed Mar 28, 2025 · Engine · 20,000 miles · IL

The contact owns a 2021 Kia Soul. The contact stated that while driving at various speeds and accelerating, the vehicle occasionally shuddered or stalled, forcing the contact to pull over onto the side of the road to restart the vehicle. The check engine warning light was illuminated. The vehicle was taken to a local Auto Zone, where a diagnostic scan retrieved information for a cylinder #1 misfire. The vehicle was taken to a local dealer, where the vehicle was diagnosed, and the contact was informed that further diagnostic testing was required to determine the cause of failure. The vehicle was not repaired. The contact referenced the federal safety agency Campaign Number: 25V099000 (ENGINE AND ENGINE COOLING) as a possible cause for the failure. The manufacturer was notified of the failure. The approximate failure mileage was 20,000.

Filed Mar 17, 2025 · Engine · MD

[XXX], driving down highway [XXX] the car lost power. I was able to start it up again but was misfiring where I drove it home. I had it towed on March 12 to Koon Kia Service, 9610 Reistertown Road, Owings Mill, MD 21117-4128. On Friday, March 14, 2025 I spoke with Blaine in the Service department and he said I after a diagnostic my car indicates that I need a new engine to repair my car. Today, I called and spoke with Blaine and told him about the recall SC336 and he said the was no remedy for this recall. I told him I would call Kia Customer service which I did and received case #[XXX] from Denise. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Feb 28, 2025 · Engine · ME

Consistent oil burning of about one quart per 1,000 MI I think an exact number would be .8 per 1000 occasional misfiring and stalling presumably due to improperly heat treated piston rings like other recalls

Filed Oct 22, 2024 · Fuel system · TX

My car has never had the gas mileage that is advertised; it’s always been about 3-4 mpg less than the 28 mpg city/31 mpg highway. Recently, I had multiple engine system failures with the plug-in check devices at places like AutoZone saying my ignition coils were misfiring, and after bringing it to the dealership twice for about 1.5 months each time for a total of 3 months, they replaced the fuel injectors and a few other parts the first time before releasing the car to me only to have the same errors come back within 24 hours and I ended up bringing it back only for them to tell me the entire fuel pump system is shot and needed to be completely replaced and all fuel flushed out. Both times I brought it in they claimed it was due to bad gas, but after talking to my insurance, my claim agent concluded it was not bad gas as newer cars like mine have internal sensors that will completely stop the car from driving or even turning on if bad gas is detected to prevent further damage and that’s never been the case for me. I’ve always been able to drive my vehicle and the only noticeable issue would be my fuel mileage. I’ve had the new fuel pump system for about a week now, and my fuel mileage is around 28-29 mpg, more than it’s ever been since I bought the vehicle back in November 2020. I’ve only ever had a max of 26 mpg no matter how or where I drive. I did find recalls on similar makes of cars with the same year as mine from both Kia and Hyundai, and I believe that the Kia Souls around 2020-2021 also have faulty fuel pump systems and should be recalled. I don’t know how many of them are out there, but despite only having 50k miles on my car, the bad gas diagnosis excluded it from the warranty and I had to pay out of pocket the $1,516.83 for the fuel pump system replacement and flushing of the ‘bad gas’ at the Kia dealership.