how to fix P0700 transmission 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 negative battery terminal to prevent electrical shorts.

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, suitable transmission fluid, funnel, drain pan.
• Remove the transmission drain plug and drain the old fluid into the pan.
• Replace the drain plug and refill the transmission with new fluid using the pump and funnel.
• Ensure the correct fluid type and quantity according to the owner’s manual.

3. Inspect and Repair Wiring and Connectors

• Tools Required: Wire stripper/crimper, multimeter, electrical tape.
• Visually inspect the transmission wiring harness and connectors.
• Repair any damaged wires by cutting out the damaged section, stripping ends, and using a crimp connector to splice in new wire.
• Use electrical tape to cover any exposed areas.

4. Replace the Transmission Control Module (if necessary)

• Tools Required: Socket set, ratchet, torque wrench.
• Remove any components obstructing access to the TCM (if applicable).
• Disconnect the wiring harness from the TCM.
• Unscrew the module from its mounting location and remove it.
• Install the new TCM by reversing the removal process, ensuring all connections are secure.
• Torque the mounting screws to manufacturer specifications.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0700 code and any other related codes.
• Perform a road test to ensure proper operation.