Steering works, but there's no throttle

Battery pack is not properly charged
- Charge onboard battery completely.
Servo unplugged
- On Traxxas micro receivers there are two channel 1 steering slots. Verify that the steering servo is firmly plugged into channel 1 and the throttle servo is firmly plugged securely into channel 2 on the receiver.
Optidrive in fault mode (If equipped)
- A red light on the Optidrive indicates a fault, and the Optidrive shuts off power to the throttle servo. A flashing light indicates low battery, solid red a signal loss or faulty sensor. See manual for more information.
Servo lead wires are cut or frayed
- Inspect wires and connectors for damage. Fix or send the servo back to Traxxas for repair.
Receiver failure
- Test the receiver or return it to Traxxas for service.
Failed or damaged servo(s)
- Test the servo(s) for proper operation. Replace if necessary
Transmitter failure
- Replace the transmitter or return it to Traxxas for service
Motor Failure
- Replace the motor
ESC (electronic speed control) requires programming or replacement