how to fix P0700 code on my Toyota Highlander Fourth Generation (2020-present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, fluid catch pan.
• Safety Warnings: Disconnect the battery before working on the electrical systems. Ensure the vehicle is on a level surface and secure it with wheel chocks.

2. Inspect and Replace Transmission Fluid

• Sub-steps:
  1. Remove the transmission fluid dipstick and check the fluid level; add fluid if low.
  2. If fluid is dirty, drain the transmission fluid using a fluid catch pan.
  3. Replace the transmission filter if applicable (refer to the service manual for specific instructions).
  4. Fill the transmission with the recommended fluid type (check owner’s manual for specifications).

3. Repair or Replace Wiring/Connectors

• Sub-steps:
  1. Inspect wiring harness and connectors to the TCM for damage.
  2. Repair any frayed wires or replace connectors as necessary.
  3. Ensure all connections are secure and free from corrosion.

4. Test and Replace Transmission Control Module (if necessary)

• Sub-steps:
  1. Using a multimeter, test the TCM for proper voltage and functionality as per manufacturer specifications.
  2. If the module is faulty, remove it by disconnecting the electrical connectors and unscrewing any mounting bolts.
  3. Install the new TCM by reversing the removal process and ensuring all connections are tight.