how to fix P0700 transmission code in 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 tools and parts before starting.
• Ensure the vehicle is parked on a flat surface and set to "Park."
• Disconnect the high-voltage battery system for safety.

2. Fluid Inspection and Replacement

• Sub-steps:
  • Locate the transmission fluid fill and drain plugs.
  • Use a wrench to remove the drain plug and allow old fluid to drain completely.
  • Inspect the fluid for discoloration or burning smell.
  • Replace with manufacturer-recommended transmission fluid.
  • Reinstall the drain plug and torque to specification.

3. TCM Inspection and Replacement

• Sub-steps:
  • Remove any panels or covers obstructing access to the TCM.
  • Disconnect the wiring harness from the TCM.
  • Inspect the TCM for signs of damage or corrosion.
  • If necessary, replace the TCM with a new unit, ensuring it is a compatible part.
  • Reconnect the wiring harness and secure any panels.

4. Electrical System Check

• Sub-steps:
  • Inspect all wiring and connectors related to the TCM for signs of wear or damage.
  • Use a multimeter to check for continuity in the wiring.
  • Repair or replace any damaged wiring as necessary.

5. Software Update

• Sub-steps:
  • Connect the vehicle to a Tesla service computer or appropriate diagnostic tool.
  • Check for available software updates specific to the transmission control system.
  • Follow on-screen prompts to install any updates.