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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is on a flat surface and the engine is off.
• Disconnect the battery to prevent electrical shock.

2. Fluid Check and Replacement

• Sub-steps:
  1. Remove the transmission dipstick and check the fluid level.
  2. If fluid is low, add the manufacturer-recommended transmission fluid.
  3. If fluid appears dirty, drain the transmission fluid by removing the drain plug.
  4. Replace with new transmission fluid, following the manufacturer's specifications for type and quantity.

3. Inspect and Repair Wiring

• Sub-steps:
  1. Visually inspect the wiring harness connected to the TCM for any signs of wear or damage.
  2. Use a multimeter to check for continuity and proper voltage at the TCM connectors.
  3. Repair or replace any damaged wiring or connectors as necessary.

4. TCM Testing and Replacement

• Sub-steps:
  1. If no wiring issues are found, test the TCM using a multimeter for proper voltage and ground.
  2. If the TCM is faulty, carefully remove it from its mounting location.
  3. Replace with a new or refurbished TCM, ensuring correct alignment and secure mounting.
  4. Reconnect all wiring and connectors securely.

5. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the battery terminals.
  2. Use an OBD-II scanner to clear the P0700 code and any other related codes.
  3. Perform a test drive to ensure the transmission operates smoothly.