how to fix P0700 transmission code in 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 necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Disconnect the 12V battery to ensure safety while working on electrical components.

2. Check and Replace Transmission Fluid

• Sub-steps:
  • Remove the transmission fluid fill plug.
  • Check fluid level; if low, top up with the manufacturer-recommended transmission fluid.
  • Inspect fluid condition; if it appears burnt or contaminated, drain and replace it.
• Tools Required: Transmission fluid pump, socket set, fluid catch basin.

3. Inspect and Repair Wiring

• Sub-steps:
  • Visually inspect the wiring harness for any frayed or damaged wires.
  • Clean and reseat any loose connectors associated with the TCM.
  • Repair any damaged wiring or connectors as necessary.
• Tools Required: Multimeter, wire strippers, soldering iron (if needed).

4. Update Software

• Sub-steps:
  • Connect the vehicle to a Wi-Fi network.
  • Navigate to the software update section in the vehicle settings.
  • Check for and install any available updates specifically addressing transmission control.
• Tools Required: Tesla mobile app or vehicle interface.

5. Replace Transmission Control Module (if necessary)

• Sub-steps:
  • Remove any panels necessary to access the TCM.
  • Disconnect the wiring harness from the old TCM.
  • Unscrew and remove the old TCM.
  • Install the new TCM, reconnect the wiring harness, and secure it in place.
• Tools Required: Socket set, torque wrench.
• Torque Values: Follow manufacturer specifications for TCM installation.