how to fix P0720 code on my Genesis G70 IG (2017-2023)

Learn how to diagnose and fix P0720 transmission issue in Genesis G70 (2017-2023). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Vehicle Speed Sensor

• Tools Required: Socket set, torque wrench, multimeter, vehicle jack and stands.
• Sub-steps:
  1. Locate the vehicle speed sensor on the transmission (refer to the service manual for exact location).
  2. Disconnect the wiring harness from the VSS.
  3. Remove the mounting bolt(s) securing the VSS using the socket set.
  4. Gently pull the sensor out of the transmission.
  5. Inspect the old sensor for signs of wear or damage and compare with the new sensor.
  6. Apply a small amount of lubricant to the O-ring of the new sensor to facilitate installation.
  7. Install the new VSS into the transmission and secure with the mounting bolt(s) to the manufacturer’s specified torque.
  8. Reconnect the wiring harness to the new vehicle speed sensor.

3. Check and Refill Transmission Fluid

• Tools Required: Transmission fluid pump, funnel.
• Sub-steps:
  1. With the vehicle level, remove the transmission fluid dipstick or fill plug.
  2. Check the fluid level and condition; it should be clean and at the correct level.
  3. If low, use the transmission fluid pump to add the appropriate type of transmission fluid as specified in the owner's manual.
  4. Replace the dipstick or fill plug securely.

4. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear any existing error codes from the ECM.