My Kandi Coco KD08E is displaying ERR 6. The car is fully charged batteries are in good working order. The car will run for a short distance then just die and display ERR 6. When restart the car is shows batteries need charge. Once they are charged again then the car will only run for a short distance. We think it is the controller, as the batteries show they are good and they are only about 12 months old. Any help would be great, love this car.