what does a P0700 code mean for my Toyota Highlander Fourth Generation (2020-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on electrical systems.
• Raise the vehicle if necessary for better access to the transmission.

2. Check Transmission Fluid

• Remove the transmission dipstick and check fluid level; add fluid if low.
• If fluid is dark or burnt, drain and replace with the manufacturer-recommended transmission fluid.
• Tools Required: Transmission fluid pump, funnel.

3. Inspect and Repair Wiring

• Visually inspect the wiring harness connected to the TCM for any signs of damage.
• Repair any broken or frayed wires, ensuring connections are secure.
• Tools Required: Wire stripper/crimper, electrical tape.

4. Replace Transmission Control Module (if necessary)

• If diagnostics indicate TCM failure, remove the existing module by unscrewing it from its mount.
• Disconnect the electrical connectors and replace with a new TCM.
• Reconnect the connectors and secure the module in place.
• Tools Required: Socket set, screwdriver set.

5. Reconnect Battery and Clear Codes

• Reconnect the battery terminals that were disconnected during preparation.
• Use the OBD-II scanner to clear the P0700 code and any other related codes.