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

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface.
• Disconnect the high-voltage battery system according to Tesla's safety protocols.
• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench.

2. Check Transmission Fluid

• Sub-steps:
  • Locate the transmission fluid dipstick or fill port.
  • Remove the dipstick, wipe it clean, and reinsert it to check the fluid level.
  • If fluid is low, fill it with the recommended transmission fluid for the Model S.
  • Check the fluid’s color and smell; if it is dark or burnt, a fluid change is necessary.
• Safety Warnings: Ensure the vehicle is off and cooled down before checking fluid levels.

3. Update TCU Software

• Sub-steps:
  • Connect to Wi-Fi and navigate to the software updates section in the vehicle’s infotainment system.
  • Download and install any available updates for the TCU.
  • Restart the vehicle after the update is complete.

4. Inspect Wiring and Connectors

• Sub-steps:
  • Locate the TCU and visually inspect all wiring harnesses and connectors for damage.
  • Use a multimeter to check for continuity in wiring and ensure there are no short circuits.
  • Repair or replace any damaged wiring or connectors as needed.

5. Clear Codes and Test Drive

• Sub-steps:
  • Use the OBD-II scanner to clear the P0700 code and any related codes.
  • Perform a test drive to observe the vehicle’s transmission performance.
  • Monitor the vehicle for any warning lights or abnormal behavior during the drive.