how to deal with a P0720 code on my Tesla Outback 4th Generation (2010-2014)

Subaru Outback 4th Generation (2010-2014)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0720

3 min read

465 words

Problem Statement

Learn how to diagnose and fix P0720 vehicle speed sensor issues in Tesla Outback (2010-2014). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0720

Affected Component

Transmission

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Ensure the vehicle is securely elevated when working underneath it.

Symptoms

•Check engine light illuminated
•Erratic speedometer readings
•Transmission shifting issues
•Poor fuel economy
•Potential stalling or rough idle

Diagnostic Steps

1
Scan the vehicle using an OBD-II scanner to confirm the P0720 code and retrieve any additional codes.
2
Inspect the vehicle speed sensor (VSS) wiring and connectors for damage, corrosion, or loose connections.
3
Measure the output voltage of the vehicle speed sensor with a multimeter while the vehicle is in motion.
4
Check the vehicle's transmission fluid level and condition, ensuring it’s within specifications.
5
Inspect the vehicle’s ECU and its ground connections for any faults.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Socket set
•Torque wrench
•Multimeter
•Screwdriver

Parts Required

•Replacement vehicle speed sensor

Related Faults

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Diagnostic Steps

1
Scan the vehicle using an OBD-II scanner to confirm the P0720 code and retrieve any additional codes.
2
Inspect the vehicle speed sensor (VSS) wiring and connectors for damage, corrosion, or loose connections.
3
Measure the output voltage of the vehicle speed sensor with a multimeter while the vehicle is in motion.
4
Check the vehicle's transmission fluid level and condition, ensuring it’s within specifications.
5
Inspect the vehicle’s ECU and its ground connections for any faults.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the negative terminal of the battery to prevent any electrical shorts.
Raise the vehicle using a jack and secure it on jack stands.

2. Replace Vehicle Speed Sensor

Tools Required: Socket set, torque wrench, multimeter, screwdriver, replacement vehicle speed sensor.
Locate the vehicle speed sensor on the transmission housing.
Remove any components obstructing access to the sensor (e.g., air intake ducting).
Disconnect the electrical connector from the vehicle speed sensor.
Remove the retaining bolt(s) securing the sensor using a socket wrench.
Gently pull the sensor out of its mounting hole. Inspect the sensor and mounting area for debris or damage.
Install the new vehicle speed sensor by reversing the removal steps:
- Insert the new sensor into the mounting hole.
- Secure it with the retaining bolt(s) and tighten to the manufacturer’s specified torque (typically around 8-10 ft-lbs).
- Reconnect the electrical connector.
Reassemble any components that were removed for access.

3. Reset the ECU

Reconnect the negative battery terminal.
Use the OBD-II scanner to clear the P0720 code from the vehicle's memory.