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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal from the battery to prevent electrical shorts.
• Raise the vehicle using a jack and secure it with jack stands if necessary.

2. Inspect and Replace Transmission Fluid

• Tools Required: Socket set, fluid pump, transmission fluid.
• Remove the transmission pan if fluid is found to be contaminated.
• Drain the old transmission fluid and replace it with the manufacturer-recommended fluid.
• Reinstall the transmission pan and torque the bolts to the manufacturer's specifications.

3. Repair or Replace Wiring

• Tools Required: Wire strippers, electrical tape, soldering iron (if needed).
• Inspect the wiring harness connected to the TCM for any frays or breaks.
• Repair any damaged wires by cutting out the affected sections and splicing in new wire or replace the entire harness if necessary.

4. Replace Transmission Control Module (if necessary)

• Tools Required: Socket set, torque wrench.
• Disconnect the wiring harness from the TCM.
• Remove the TCM from its mounting location.
• Install the new TCM by reversing the removal steps, ensuring to torque bolts to specifications.
• Reconnect the battery terminal.

5. Clear Codes and Test Drive

• Use the OBD-II scanner to clear the P0700 and any other related codes.
• Test drive the vehicle to ensure proper transmission operation and monitor for any reoccurring codes.