how to fix P0700 code in my Toyota Highlander Third Generation (2014-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to prevent electrical shock.

2. Check Transmission Fluid

• Tools Required: Transmission fluid dipstick, funnel, transmission fluid.
• Remove the transmission dipstick and check the fluid level.
• If low, add the recommended transmission fluid until it reaches the proper level.
• Inspect fluid condition; if dirty or burnt, a fluid change is needed.

3. Inspect and Repair Wiring

• Tools Required: Multimeter, wire strippers, electrical tape.
• Visually inspect the wiring harness for damage or fraying.
• Use a multimeter to test for continuity and resistance in the wiring.
• Repair any damaged wires using wire strippers and electrical tape or replace the wiring harness if necessary.

4. Replace Transmission Control Module (if necessary)

• Tools Required: Socket set, torque wrench.
• If the TCM tests faulty, remove the old TCM by unbolting it from its mounting.
• Disconnect the wiring harness from the TCM.
• Install the new TCM in the reverse order of removal and torque bolts to manufacturer specifications.

5. Reconnect Battery and Test

• Reconnect the battery terminals securely.
• Start the vehicle and allow it to reach operating temperature.
• Clear the P0700 code using the OBD-II scanner and test drive the vehicle to ensure proper transmission operation.