what does a P0700 code mean for my Toyota Highlander XU70 (2020-Present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.
• Raise the vehicle using a jack and support it securely with jack stands.

2. Inspect and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, fluid catch basin, funnel
• Remove the transmission fluid pan (if applicable) to access the fluid.
• Check the fluid for color and smell; it should be a bright red and not burnt.
• If fluid is low or contaminated, drain the old fluid completely.
• Replace with manufacturer-recommended transmission fluid, filling it to the correct level.

3. Check and Repair Wiring/Connectors

• Visually inspect the wiring harness connected to the TCM for any signs of wear or damage.
• Use a multimeter to test for continuity in the wires.
• Repair or replace any damaged wiring or connectors as needed.

4. TCM Testing/Replacement

• If prior steps do not resolve the issue, test the TCM using a specialized diagnostic tool.
• If the TCM is found to be faulty, remove it from its mounting location.
• Replace it with a new or reprogrammed unit as necessary, ensuring compatibility with your vehicle.

5. Reassemble and Reset Codes

• Reinstall the transmission fluid pan and ensure it is properly sealed and torqued to specifications.
• Reconnect the battery terminal.
• Clear any diagnostic codes using the OBD-II scanner.
• Start the vehicle and let it idle for a few minutes before checking for leaks.