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

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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface, and set the parking brake.
• Disconnect the battery to avoid electrical shorts during repairs.

2. Check and Replace Transmission Fluid

• Sub-steps:
  • Locate the transmission fluid dipstick or fill port.
  • Remove the dipstick and check the fluid level and quality; if the fluid is dirty or burnt, it needs to be replaced.
  • If necessary, drain the old transmission fluid using a fluid pump or drain plug.
  • Refill with manufacturer-recommended transmission fluid to the appropriate level.
• Tools Required: Fluid pump, funnel, container for old fluid.

3. Inspect and Repair Wiring and Connectors

• Sub-steps:
  • Visually inspect the wiring harness connected to the transmission control module for fraying or disconnects.
  • Clean any corroded connectors using electrical contact cleaner.
  • Repair or replace any damaged wiring or connectors as needed.
• Tools Required: Electrical contact cleaner, wire strippers/crimpers.

4. Update Transmission Control Module Software

• Sub-steps:
  • Connect the Tesla to the official Tesla service tool or diagnostic device.
  • Check for available software updates for the transmission control module.
  • Follow the on-screen prompts to update the software if required.
• Tools Required: Tesla service tool or compatible diagnostic software.

5. Reconnect the Battery and Clear Codes

• Sub-steps:
  • Reconnect the battery terminals securely.
  • Use the OBD-II scanner to clear the P0700 code from the system.
  • Perform a test drive to ensure the issue is resolved.
• Tools Required: OBD-II scanner.