how to fix P0740 torque converter code in Tesla Outback 6th Generation (2020-2024)

Learn how to diagnose and fix P0740 torque converter issues in Tesla Outback (2020-2024). Step-by-step guide with symptoms, diagnostics, and repair instructions.

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, torque wrench, transmission fluid pump, and safety gloves.
• Park the vehicle on a flat surface, engage the parking brake, and disconnect the battery.

2. Inspect and Replace Transmission Fluid

1. Check Fluid Level

   • Start the engine and allow it to reach operating temperature.
   • With the vehicle in park, check the transmission fluid level using the dipstick.
   • If low, add the recommended transmission fluid type (e.g., CVT fluid).

2. Change Fluid if Contaminated

   • Remove the transmission pan using a socket set and drain the old fluid into a container.
   • Replace the transmission filter if applicable.
   • Clean the transmission pan and magnet, ensuring no debris is present.
   • Reinstall the pan and torque to manufacturer specifications.

3. Inspect Torque Converter Clutch Solenoid

1. Locate the Solenoid

   • Refer to the vehicle service manual to locate the torque converter clutch solenoid.

2. Testing

   • Disconnect the electrical connector from the solenoid.
   • Set a multimeter to the resistance setting and measure the resistance across the solenoid terminals; compare with specifications in the service manual.
   • If out of spec, replace the solenoid.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0740 code from the vehicle's computer.

5. Final Checks

• Test drive the vehicle to ensure proper operation of the transmission and verify that the check engine light remains off.