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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is turned off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Check Transmission Fluid

• Remove the transmission dipstick and inspect the fluid condition.
  • Sub-step: If the fluid is low, add the manufacturer-recommended type of transmission fluid.
  • Sub-step: If the fluid is burnt or contaminated, plan for a transmission fluid change.

3. Inspect Wiring and Connectors

• Visually inspect all wiring and connectors leading to the transmission control module.
  • Sub-step: Repair or replace any damaged wiring or corroded connectors.
  • Sub-step: Ensure all connections are secure and free of dirt or debris.

4. Test Transmission Control Module (TCM)

• Using a multimeter, test the voltage and ground connections to the TCM.
  • Sub-step: If readings are outside the specified range, consider replacing the TCM.
  • Sub-step: Follow the manufacturer’s specifications for any specific testing procedures.

5. Replace Transmission Control Module (if necessary)

• If the TCM is faulty, proceed to remove it.
  • Sub-step: Disconnect all electrical connectors from the TCM.
  • Sub-step: Unbolt the TCM from its mounting location and remove it.
  • Sub-step: Install the new TCM by reversing the removal steps.
  • Sub-step: Reconnect all connectors securely.

6. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the vehicle and check for any warning lights.
• Test drive the vehicle to ensure proper shifting and performance.