how to fix P0720 code on my Volvo XC60 First Generation (2008-2017)

Learn how to diagnose and fix P0720 transmission issue in Volvo XC60. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, vehicle jack, safety stands.
• Disconnect the battery to prevent electrical shorts during repairs.
• Raise the vehicle using a jack and secure it with safety stands.

2. Inspect and Replace the Vehicle Speed Sensor

1. Locate the vehicle speed sensor, typically mounted on the transmission.
2. Disconnect the electrical connector from the VSS.
3. Remove the mounting bolts using the socket set.
4. Carefully pull the sensor out from its housing.
5. Compare the old sensor with the new one to ensure compatibility.

3. Install New Vehicle Speed Sensor

1. Insert the new VSS into the housing.
2. Secure it in place with the mounting bolts. Torque to manufacturer specifications (typically around 7-9 Nm).
3. Reconnect the electrical connector ensuring a snug fit.

4. Check Wiring and Connectors

1. Inspect the wiring harness connected to the VSS for any signs of wear, fraying, or corrosion.
2. Repair or replace any damaged wiring or connectors as necessary.

5. Reconnect Battery and Test

1. Reconnect the vehicle battery.
2. Start the engine and allow it to idle for a few minutes.
3. Clear the error code using the OBD-II scanner.
4. Take the vehicle for a test drive to ensure normal operation and check for any reoccurring codes.