how to fix P0700 code in Toyota Highlander Fourth Generation (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 ensure safety.

2. Check and Replace Transmission Fluid

• Tools Required: Socket set, funnel, transmission fluid
• Check the transmission fluid level with the dipstick; add fluid if low.
• If fluid appears burnt or contaminated, drain the transmission fluid.
• Remove the transmission pan bolts with a socket wrench and carefully lower the pan.
• Replace the transmission filter as needed.
• Reinstall the transmission pan, ensuring a proper seal.
• Fill the transmission with the correct type of fluid via the dipstick tube.

3. Repair or Replace TCM

• Tools Required: Multimeter, OBD-II scanner, socket set
• If TCM tests indicate a fault, remove the TCM from its mounting location.
• Disconnect all wiring harnesses attached to the TCM.
• Install the new or repaired TCM, ensuring all connections are secure.
• Reconnect the battery.

4. Clear Codes and Test Drive

• Tools Required: OBD-II scanner
• Use the OBD-II scanner to clear the P0700 code and any other related codes.
• Start the vehicle and allow it to reach operating temperature.
• Conduct a test drive to ensure proper shifting and operation of the transmission.