how to fix P0700 transmission fault code in Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0700 transmission fault in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, torque wrench, multimeter, transmission fluid pump
• Safety Warnings: Disconnect the high-voltage battery before starting work on the transmission system.

2. Address Transmission Fluid

• Check Levels: If low, top up with the manufacturer's recommended transmission fluid.
• Fluid Change: If the fluid is contaminated:
  1. Raise the vehicle securely on jack stands.
  2. Remove the transmission drain plug and let fluid drain into a suitable container.
  3. Replace the drain plug and remove the fill plug.
  4. Use a transmission fluid pump to add new fluid until it reaches the recommended level.
  5. Reinstall the fill plug and ensure it's secure.

3. Update TCM Software

• Connect the vehicle to the Tesla service tool or appropriate diagnostic software.
• Follow on-screen prompts to check for and install any available TCM software updates.

4. Inspect and Repair Wiring

• Visually inspect the wiring harness connected to the transmission.
• Use a multimeter to check for continuity and proper voltage at the connectors.
• Repair or replace any damaged wires or connectors as necessary.

5. Reset TCM

• Using the OBD-II scanner, navigate to the transmission control module settings.
• Execute the reset function to clear fault codes and reset the system.