The contact owned a 2017 Kia Optima Hybrid. The contact stated that while her mother was driving at an undisclosed speed, a smoke odor was detected. Another driver alerted the contact's mother that there was a fire coming from underneath the vehicle. The contact's mother pulled over and exited the vehicle. There were flames coming from underneath the hood of the vehicle, and within seconds, the vehicle was engulfed in flames. No injury was sustained and no medical treatment was received. The fire department was able to extinguish the fire. A fire department report was filed. The vehicle did not have insurance and remained on the side of the road, where it caught fire. The manufacturer was not made aware of the failure. Upon investigation, the contact related the failure to NHTSA Campaign Number: 21V844000 (Engine) associated with the VIN; however, the contact did not receive the recall notification. The failure mileage was approximately 106,000.