how to fix the P0720 code on Tesla Model S Plaid/Refresh (2021-present)?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

Error Code: P0720

3 min read

490 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0720 vehicle speed sensor issues in Tesla Model S Plaid. 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.
•Allow the vehicle to cool before working on the transmission area.

Symptoms

•Check engine light illuminated
•Erratic speedometer readings
•Loss of regenerative braking functionality
•Vehicle acceleration issues
•Poor performance in power delivery

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0720 and check for any related codes.
2
Inspect the vehicle speed sensor wiring harness for any visible damage or corrosion.
3
Measure the resistance of the vehicle speed sensor using a multimeter to ensure it is within manufacturer specifications.
4
Check the vehicle speed sensor connector for proper seating and any bent or corroded pins.
5
Inspect the vehicle's control module for any software updates that may address the issue.

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
•Multimeter
•Torque wrench

Parts Required

•Vehicle speed sensor (if damaged)
•Electrical connector cleaner (if corrosion is present)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0720 and check for any related codes.
2
Inspect the vehicle speed sensor wiring harness for any visible damage or corrosion.
3
Measure the resistance of the vehicle speed sensor using a multimeter to ensure it is within manufacturer specifications.
4
Check the vehicle speed sensor connector for proper seating and any bent or corroded pins.
5
Inspect the vehicle's control module for any software updates that may address the issue.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is on a flat surface and secured with wheel chocks.
Disconnect the negative terminal of the 12V battery to prevent electrical shock.

2. Remove the Vehicle Speed Sensor

Locate the vehicle speed sensor on the transmission.
Use a socket set to remove the retaining bolt(s) securing the sensor.
Carefully pull the sensor out of its housing, ensuring no debris enters the transmission.

3. Inspect and Clean

Inspect the old sensor for any physical damage or debris.
Clean the sensor mounting area on the transmission using a lint-free cloth.
If the sensor is damaged, proceed to replace it with a new one.

4. Install the New Vehicle Speed Sensor

Insert the new vehicle speed sensor into the transmission housing.
Secure it with the retaining bolt(s) to the manufacturer’s torque specifications (typically around 8-10 Nm).
Reconnect the electrical connector ensuring it clicks into place securely.

5. Reconnect Battery and Test

Reconnect the negative terminal of the 12V battery.
Start the vehicle and allow it to reach operating temperature.
Conduct a test drive to ensure the speedometer works correctly and the P0720 code does not return.