how to troubleshoot P0700 transmission error in Tesla Model S Plaid/Refresh (2021-present)

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

Solution

1. Preparation

• Gather all tools and parts required.
• Ensure the vehicle is parked on a level surface and is in 'Park' mode.
• Disconnect the 12V battery to prevent electrical shorts.

2. Fluid Inspection and Replacement

• Tools Required: Transmission fluid pump, socket set, fluid catch pan.
• Steps:
  1. Remove the transmission fluid fill plug.
  2. Insert a fluid pump and extract a sample of the fluid to check its condition.
  3. If the fluid is discolored or smells burnt, drain the existing fluid completely.
  4. Replace with manufacturer-recommended transmission fluid (consult Tesla service manual for specifications).
  5. Reinstall the fill plug and torque to manufacturer specifications.

3. Wiring and Connector Check

• Tools Required: Multimeter, wire brush, electrical contact cleaner.
• Steps:
  1. Inspect the wiring harness for any signs of wear, fraying, or damage.
  2. Use a multimeter to check continuity in the wires leading to the TCM.
  3. Clean any corroded connectors with electrical contact cleaner.
  4. Reconnect any loose connectors securely.

4. TCM Testing and Replacement

• Tools Required: Multimeter, OBD-II scanner.
• Steps:
  1. Remove the TCM from its mounting location.
  2. Test the TCM’s power and ground connections with a multimeter.
  3. If the TCM is faulty, replace it with a new unit following the manufacturer's instructions.
  4. Reinstall the TCM and ensure all connections are secure.

5. Software Update

• Tools Required: Tesla service tool or access to Tesla's customer software update portal.
• Steps:
  1. Connect the vehicle to Wi-Fi.
  2. Check for any software updates available for the vehicle.
  3. Follow on-screen instructions to download and install updates.