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

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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface, and the parking brake is engaged.

2. Update Software

• Connect the vehicle to a reliable Wi-Fi network.
• Access the Tesla software menu via the touchscreen.
• Check for any available software updates and install them.
• Restart the vehicle after updates are complete.

3. Inspect and Replace Transmission Fluid

• Use a socket set to remove the transmission fluid fill plug.
• Check the fluid level using a dipstick or by observing the fluid flow from the fill hole.
• If low, add the recommended transmission fluid (Tesla-approved fluid).
• If dirty, drain the old fluid using a suitable fluid extraction tool, replace with new fluid, and replace the fill plug to the manufacturer’s torque specifications.

4. Inspect Wiring and Connectors

• Visually inspect the wiring harness and connectors leading to the TCM.
• Look for fraying, corrosion, or loose connections.
• If damaged, repair or replace the affected wiring or connectors.

5. Replace Transmission Control Module (if necessary)

• Disconnect the battery to prevent electrical shock.
• Remove the TCM using a socket set, taking care to mark and remember the wiring connections.
• Install the new TCM by reversing the removal steps and reconnecting all wiring securely.