how to fix P0720 output speed sensor code in Tesla Model S Plaid/Refresh (2021-present)

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0720

3 min read

553 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 output speed sensor code in Tesla Model S Plaid/Refresh. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0720

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the vehicle to cool before accessing any hot components.

Symptoms

•Check engine light illuminated
•Erratic or unresponsive transmission behavior
•Delayed or harsh shifting during acceleration
•Reduced acceleration performance
•Potential loss of regenerative braking capability

Diagnostic Steps

1
Scan the vehicle's onboard diagnostics (OBD-II) system using a compatible scanner to confirm the P0720 code.
2
Inspect the output speed sensor wiring and connectors for physical damage, corrosion, or loose connections.
3
Measure the resistance of the output speed sensor with a multimeter to ensure it is within manufacturer specifications.
4
Check the vehicle’s transmission fluid level and condition to rule out fluid-related issues.
5
Verify voltage supply to the output speed sensor while the vehicle is in operation.
6
Monitor live data from the transmission control module to assess the sensor's performance in real-time.

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
•Multimeter
•Socket set
•Torque wrench

Parts Required

•New output speed sensor
•Thread sealant (if specified)

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Diagnostic Steps

1
Scan the vehicle's onboard diagnostics (OBD-II) system using a compatible scanner to confirm the P0720 code.
2
Inspect the output speed sensor wiring and connectors for physical damage, corrosion, or loose connections.
3
Measure the resistance of the output speed sensor with a multimeter to ensure it is within manufacturer specifications.
4
Check the vehicle’s transmission fluid level and condition to rule out fluid-related issues.
5
Verify voltage supply to the output speed sensor while the vehicle is in operation.
6
Monitor live data from the transmission control module to assess the sensor's performance in real-time.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, socket set, torque wrench.
Ensure the vehicle is parked on a flat surface and the ignition is turned off before beginning the repair.

2. Inspect and Replace Output Speed Sensor

Locate the Output Speed Sensor:
- Refer to the service manual for the specific location of the output speed sensor on the Tesla Model S Plaid/Refresh.
Disconnect the Battery:
- Disconnect the negative terminal of the 12V battery to prevent electrical shorts.
Remove the Underbody Shield (if applicable):
- Use a socket set to remove any screws or fasteners holding the underbody shield in place to access the output speed sensor.
Unplug the Sensor:
- Carefully disconnect the wiring harness from the output speed sensor.
Remove the Old Sensor:
- Use the appropriate socket to unscrew the output speed sensor from its mounting location. Keep track of any washers or gaskets.
Install the New Sensor:
- Apply a small amount of thread sealant if specified by the manufacturer.
- Screw the new output speed sensor into place and tighten to the manufacturer's torque specifications.
Reconnect Wiring Harness:
- Plug the wiring harness back into the new output speed sensor, ensuring a secure connection.
Reinstall Underbody Shield:
- Replace any removed underbody shield components using the original screws or fasteners.
Reconnect the Battery:
- Reconnect the negative terminal of the battery.

3. Clear Error Codes

Use an OBD-II scanner to clear the P0720 code from the vehicle's computer.