how to troubleshoot P0720 code on Tesla Model S Original (2012-2020)

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

Error Code: P0720

3 min read

509 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 troubleshoot and fix P0720 code in Tesla Model S (2012-2020). 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 down before inspecting the transmission.

Symptoms

•Check engine light illuminated
•Erratic or incorrect speedometer readings
•Transmission shifting problems
•Unusual engine behavior during acceleration
•Reduced power or performance in certain driving conditions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the presence of P0720.
2
Inspect the output speed sensor and its wiring for any visible damage or disconnection.
3
Check the vehicle’s connector for corrosion or loose connections.
4
Test the output speed sensor using a multimeter to measure resistance.
5
Inspect the transmission fluid level and condition; low or contaminated fluid can cause sensor issues.
6
Review any related codes that may provide additional context regarding 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
•Multimeter
•Socket set
•Torque wrench
•Safety glasses

Parts Required

•Output speed sensor (if faulty)
•Transmission fluid (if needed)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the presence of P0720.
2
Inspect the output speed sensor and its wiring for any visible damage or disconnection.
3
Check the vehicle’s connector for corrosion or loose connections.
4
Test the output speed sensor using a multimeter to measure resistance.
5
Inspect the transmission fluid level and condition; low or contaminated fluid can cause sensor issues.
6
Review any related codes that may provide additional context regarding the issue.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, safety glasses.
Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Replace Output Speed Sensor

Locate the Output Speed Sensor:
- Follow the transmission housing to find the output speed sensor, typically mounted on the side.
Remove the Sensor:
- Use a socket set to remove the mounting bolts securing the sensor.
- Gently twist and pull the sensor out of the transmission, taking care not to damage surrounding components.
Install New Sensor:
- Apply a small amount of transmission fluid to the O-ring of the new sensor to facilitate installation.
- Insert the new sensor into place and secure it with the mounting bolts. Torque to manufacturer specifications (typically around 10-12 Nm).

3. Reconnect Wiring and Components

Reconnect the Electrical Connector:
- Ensure the connector is clean and free of corrosion before reconnecting it to the new sensor.
- Push firmly until it clicks into place.
Recheck Fluid Levels:
- Check and top up transmission fluid if necessary, using the specified type of fluid for the Tesla Model S.

4. Reconnect Battery and Clear Codes

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