1. Make sure the battery is installed properly and has sufficient charge.
2. Check whether the motor is stuck, after powering off the car and transmitter, try to push the car back and forth, and then see whether the car can connect with the frequency successfully.
3. If the noise from the motor is too loud, check whether the Motor Pinion which is closed to motor is loosened and whether the gear is worn out. The car could not go forward or backward as the Motor Pinion does not fit tightly with the gear.
4. After removing the shell from the car, place the car on the bracket, so as to leaving the four wheels off the ground, check whether the dog bone, steering tie rod tire latch, and hexagon are falling off or coming loose.