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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent any electrical short.
• Allow the vehicle to cool before working on the transmission.

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, socket set, fluid catch pan.
• Inspect the transmission fluid level and condition. If low, top off with the manufacturer-recommended fluid type.
• If the fluid is dirty or burnt, drain the old fluid using a fluid catch pan and replace it with fresh transmission fluid.

3. Inspect and Repair Wiring

• Tools Required: Multimeter, wire brush, electrical cleaner.
• Visually inspect all wiring and connectors related to the TCM for damage.
• Clean any corroded connections with electrical cleaner and a wire brush.
• Repair or replace any damaged wires or connectors.

4. Test and Replace TCM (if necessary)

• Tools Required: OBD-II scanner, multimeter, socket set.
• If the TCM is deemed faulty based on voltage tests, remove the old TCM by unscrewing it from its mounting location.
• Install the new TCM by reversing the removal steps and ensuring all connectors are securely attached.
• Reconnect the battery.

5. Recheck System

• Clear any stored codes using an OBD-II scanner.
• Perform a test drive to verify if the P0700 code returns.