The contact owned a 2020 Chevrolet Silverado 2500. The contact stated the seat heater was disengaged but failed to respond, causing the seat to remain hot. There were no warning lights illuminated. The vehicle was not diagnosed nor repaired by an independent mechanic or dealer. The contact stated the failure had been reoccurring. The contact stated while the vehicle was parked and running, she heard an abnormal popping sound coming from the vehicle, as she turned around, she noticed smoke coming out of the vehicle. The contact stated a fire had started underneath the driver seat and she was able to extinguish it with the assistance of emergency units. The contact stated she sustained mild burns on her hands and arms but did not seek medical assistance. A police report was not filed. The vehicle was towed to a tow lot, where it was totaled. The dealer was notified of the failure. The manufacturer was notified of the failure and did not provide any assistance. The approximate failure mileage was 5000.