2020 Kia Sorento: misfire or rough idle

Filed Jun 2, 2026 · Engine, Fuel system · CA

The vehicle suffered a sudden, severe engine malfunction/misfire while in operation, presenting a serious safety hazard on the road. Following the incident, the vehicle was taken to an authorized dealership service center (Repair Order #XXX), where technicians verbally confirmed that the engine requires a complete replacement due to internal mechanical failure. The catastrophic mechanical failure of the engine directly caused consequential damage to the emissions system, entirely clogging the catalytic converter with unburned fuel/debris. Despite the clear link to the known, systemic defects inherent to the Theta II engine line—which is subject to active federal consent orders, safety recalls, and lifetime warranty extensions—both the dealership and Kia Corporate are refusing to honor the 8-year/80,000-mile Federal Emissions Defect Warranty. The manufacturer is attempting to use the catastrophic failure of their own defective, recalled engine line to evade their legal environmental and safety warranty obligations, leaving the consumer stranded without alternative transportation. This represents a systemic effort by the manufacturer to deflect liability for documented powertrain safety failures onto individual consumers. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jan 27, 2026 · Engine · IL

My engine light is on. Codes show cylinder 4 misfire. Code P0304. My vehicle slows down while driving. It takes time to excelerate to a reasonable speed. My vehicle is becoming harder to start each time. I purchased a new battery and replaced spark plugs to no avail. I’ve been told from several mechanics that my engine is bad and needs to be replaced. Kia has refused to replace my engine or help in any way and I feel this is something caused by the manufacture. Others have had the same issue. The vehicle is burning oil and I have practically had to stop driving the vehicle. It is my only means of transportation. I have 113,000+ miles.

Filed Jan 27, 2026 · Engine · SC

The engine check light is on and the car is using more oil than it should. I had the oil changed and had to add quarts before 2000 miles. I called Kia and was told my VIN is not part of the recall. I got an inspection and Cylinder 2 is misfiring and has low pressure so the entire engine needs a replacement.

Filed Sep 20, 2025 · Engine · KY

My 2020 Sorento has ALWAYS had regular maintenance , very well taken care of. Started using oil around 80,000 miles, around 98,500 it misfired while driving to work and we were told it was the coil pack and spark plugs needing changed. Ran good for 3 1/2 weeks and we had to change another spark plug. Was told this was “ normal” 1 month later and I’m stuck on the side of the road broken down with no power cause the engine quit. By that time we were over 100,000 so Kia said they wouldn’t cover it. Paid to have a new engine put in. Seems like this is a going thing for this make and model. It needs a recall ASAP. It put us in a terrible financial crisis as it was our only vehicle.

Filed Jul 16, 2025 · Engine · OH

Oil consumption issues started around 60k miles took to dealer for consumption test failed it, they decarbonized my piston rings. I returned around 85k miles with the same complaint for oil consumption the dealer did the test I returned they said I passed. I am constantly having to put oil in my vehicle about 2 quarts every full take about (379 miles) the piston rings are causing my spark plugs to be oil fouled Kia knew this and pushed me out the door. Now my car is constantly misfiring and the engine is slowly dying with only 117k miles on it and 5 years old.

Filed Mar 5, 2025 · Engine · IL

[XXX] while driving down the highway the vehicle started to stall and shake significantly, while exiting the highway then and only then did a check engine light and oil pressure light. The safety of myself as well as my husband and 4 kids was put at risk b y the fact that it was during the solar eclipse, and our area highways were bumper to bumper traffic. With multiple accidents already happenening in the area. Had we not safely been able to exit the highway ourselves as well as any other individual around us could have been in imminent danger of a serious accident. The problem has absolutely been confirmed by Larry stovesand kia as well as sales automotive. The vehicle has not further been inspected. As kia stated it is a cylinder 4 misfire requiring a total engine replacement. That they state is not covered under warranty (exceeded miles) or class action that includes kia sorentos up to year 2019. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)