how to resolve P0793 code in my Tesla Model S Plaid/Refresh (2021-present)?

Learn how to diagnose and fix P0793 code related to the transmission fluid temperature sensor in Tesla Model S Plaid. Step-by-step guide included.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal.

2. Inspect and Replace the Transmission Fluid Temperature Sensor

• Tools Required: Socket set, wrench set, multimeter, OBD-II scanner.
• Locate the transmission fluid temperature sensor on the transmission housing.
• Disconnect the electrical connector from the sensor.
• Remove the mounting bolts securing the sensor using the socket set.
• Carefully pull the sensor out of its housing, taking care not to damage surrounding components.
• Install the new transmission fluid temperature sensor by reversing the removal process.
  • Ensure proper torque specifications for the mounting bolts (typically around 10 Nm; verify with service manual).
  • Reconnect the electrical connector securely.

3. Refill Transmission Fluid (if necessary)

• If the transmission fluid was low or contaminated, drain the old fluid using a fluid pump.
• Replace it with manufacturer-recommended transmission fluid (consult the owner’s manual for specifications).
• Fill the transmission fluid to the correct level as indicated on the dipstick or fill plug.

4. Reconnect Battery and Reset Codes

• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the P0793 code from the vehicle's computer.
• Check for any remaining codes to ensure the issue is resolved.