how to fix P0700 code on my Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to avoid electrical shorts.

2. Fluid Change

• Sub-steps:
  1. Remove the transmission drain plug and drain the old fluid into a suitable container.
  2. Replace the drain plug and tighten it to the manufacturer’s specified torque (usually around 30-40 ft-lbs).
  3. Refill the transmission with new fluid using a funnel; refer to the owner's manual for the correct type and amount of fluid (typically Toyota ATF WS).

3. Inspect and Repair Wiring

• Sub-steps:
  1. Remove the protective cover over the transmission control module.
  2. Inspect the wiring harness and connectors for any signs of wear, corrosion, or loose connections.
  3. Repair or replace any damaged wiring or connectors.

4. Replace Transmission Control Module (if necessary)

• Sub-steps:
  1. Disconnect the battery again for safety.
  2. Remove the mounting bolts and disconnect the electrical connectors from the old transmission control module.
  3. Install the new transmission control module and reconnect the connectors.
  4. Secure the module with mounting bolts to the specified torque.