how to fix P0700 code in Toyota Highlander Fourth Generation (2020-present)

Solution

1. Preparation

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

2. Inspect and Replace Transmission Fluid

• Remove the transmission fluid dipstick and check the fluid level.
• If low, add the recommended ATF (Automatic Transmission Fluid) as per the owner's manual.
• If the fluid is burnt or contaminated, proceed to drain and replace the fluid.
  • Tools Required: Fluid pump, drain pan, funnel
  • Sub-steps:
    1. Place a drain pan under the transmission pan.
    2. Remove the drain plug or pan bolts to drain the old fluid.
    3. Replace the drain plug and refill with new ATF through the dipstick tube.

3. Inspect Electrical Connections

• Visually inspect the wiring harness connected to the TCM and transmission sensors.
• Repair or replace any damaged wires or connectors.
  • Tools Required: Wire strippers, soldering iron, heat shrink tubing

4. Test and Replace TCM (if necessary)

• If the TCM is not functioning correctly, it may need replacement.
  • Sub-steps:
    1. Remove the TCM from its mounting location.
    2. Disconnect the electrical connectors.
    3. Install the new TCM by reversing the removal steps.
  • Tools Required: Socket set, ratchet wrench

5. Replace Transmission Range Sensor (if necessary)

• If the range sensor is faulty, it will need replacement.
  • Sub-steps:
    1. Locate the transmission range sensor on the transmission.
    2. Disconnect the wiring harness and remove the mounting bolts.
    3. Install the new sensor and reconnect the wiring.
  • Tools Required: Socket set, ratchet wrench