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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the vehicle battery to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and secured with wheel chocks.

2. Check and Change Transmission Fluid

• Tools Required: Socket set, transmission fluid pump, fluid catch pan.
• Inspect the transmission fluid dipstick (if applicable) or remove the fill plug.
• If fluid is low, add the specified transmission fluid (consult the owner’s manual for type).
• If fluid is dirty or burnt, drain the transmission fluid via the drain plug into a catch pan.
• Replace with new transmission fluid using a fluid pump, ensuring the correct amount is added as per manufacturer's specifications.
• Recheck the fluid level after running the engine for a few minutes.

3. Inspect Wiring and Connectors

• Tools Required: Multimeter, wiring diagram.
• Visually inspect the wiring harness and connectors for the TCM.
• Use a multimeter to test for continuity and proper voltage supply to the TCM.
• Repair or replace any damaged wiring or connectors found during the inspection.

4. Replace Transmission Control Module (if needed)

• Tools Required: Socket set, torque wrench.
• Locate the TCM (usually near the transmission or under the dashboard).
• Disconnect the electrical connectors carefully.
• Remove the mounting bolts securing the TCM and take it out.
• Install the new TCM and secure it with bolts to the specified torque.
• Reconnect the electrical connectors.

5. Clear Codes and Test Drive

• Tools Required: OBD-II scanner.
• Reconnect the vehicle battery.
• Use the OBD-II scanner to clear any stored trouble codes.
• Perform a test drive to ensure proper shifting and operation of the transmission.