2023 Kia Sportage: misfire or rough idle

Filed Nov 2, 2026 · IL

I am filing a safety complaint regarding our 2023 Kia Sportage, VIN [XXX], with approximately 51,331 miles. The vehicle began experiencing shaking and vibration while driving at speeds below approximately 40 mph. The check-engine warning light also illuminated. This raised serious concerns about the vehicle's reliability and safe operation, particularly because my daughter regularly drives this vehicle to and from school. I am concerned about the possibility of an unexpected loss of power, breakdown, or other mechanical failure while she is driving. On XXX, the vehicle was inspected at Napleton's River Oaks Kia in [XXX]. According to Repair Order #XXX, diagnostic testing confirmed engine misfires in cylinders 2 and 4. The technician swapped ignition coils, performed additional testing, and documented that the misfires returned. Carbon buildup was identified on the cylinder 2 spark plug, and all four spark plugs were replaced at a cost of $406.17. Although the shaking and vibration stopped following this repair, the underlying cause of the misfires remains a concern. I subsequently learned about an investigation involving alleged defective fuel injectors in certain 2023 Kia Sportage vehicles and Kia Technical Service Bulletin FUE068. I do not know whether our vehicle has a defective fuel injector, and the dealership's invoice does not indicate whether the injectors were tested. I am requesting that the federal safety agency review this incident to determine whether the engine misfires could be associated with a broader vehicle safety defect. The vehicle has been inspected by an authorized Kia dealership, and the repair documentation is available upon request. The original spark plugs' availability for inspection is UNKNOWN. My primary concern is the safety of my daughter and other motorists should a similar malfunction occur again. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 8, 2026 · Engine · TN

Power lose while accelerating (Especially on the highway), misfire causing rough idle. Code reading P0301 for fuel injector in cylinder 1. Kia is aware of this issue and has a TSB out for it however will not cover for the cost to replace the fuel injectors. Because of this issue my car does get up to speed in an appropriate amount of time causing a safety concern no only for me but for cars around me. This is also not a constant misfire and is unpredictable when it will happen.

Filed Sep 27, 2024 · Engine · VA

on [xxx], I was told MY 2023 Kia Sportage has an engine Failure. The car needs a new engine. The car has been in the shop for over 30 days. I went to the Kia Oursman of Alexandria VA to get an update on the car. I was told they don't know what's wrong with the engine. The only thing they know is there is a defect in the engine where the engine is misfiring. I was told they can't tell me anything yet about the engine. They have my car in the shop for over 30 days, and they still can't tell me what's wrong with it except that it has an engine defect. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 10, 2024 · Transmission · VA

2023 Kia Sportage misfires, engine will stall and shut off. Afterwards, I am unable to start the car. It has happened three times. (11/23/24, 3/05/24 and 5/05/24). Each time the dealership blamed poor fuel quality (three different gas stations). Not covered under warranty. First incident almost $8,000 in repair cost. Second incident $1,300 in repair cost. Third incident the dealership took responsibility. I had been without my car for a total of 6 months or more. Each time the vehicle is repaired within 13/14 days it happened again. I just got my car back (third time) about a week ago. I am uncomfortable driving it, because I fear it will misfire and shut off again while I am driving and the dealership will say it’s poor fuel quality. Vehicle has 28,900 miles on it. I’ve had it for over 2 years. The contact stated it began to misfire, again! This is the 4th time in about 7 months and each time the dealership repairs it, it happens again.

Filed Jul 10, 2023 · Engine · CO

The vehicle has lost acceleration twice and one of those times, it was a hazard to other drivers and put my safety at risk because it loss power in the passing lane on a major highway. The car shut off and I had to restart it about 8 times to get it over to the side of the road. Each time there was white and black smoke, the car would shake and just shut off. The car has been in the shop once before and they think it was a cylinder misfire and they said they fixed it. This is the second time it is in there. The car is still under warranty. Other times it has been for several recalls. There were no times that the car would do this, no symptoms or messages. This is a safety hazard for other drivers and puts the drivers life in danger. This is not what a new car experience should be.