how to fix the P0700 code on my Toyota Highlander Fourth Generation (2020-present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a level surface and securely lifted if necessary.

2. Check and Replace Transmission Fluid

• Sub-steps:

  1. Locate the transmission dipstick (if equipped) or the transmission fluid fill port.
  2. Remove the dipstick or fill plug and check the fluid level with the engine running.
  3. If the fluid is low, add the recommended type of transmission fluid (typically Toyota ATF WS).
  4. If the fluid is dark or has a burnt smell, drain and replace the fluid.

• Tools Required:

  • Transmission fluid pump
  • Funnel
  • Rags for cleanup

3. Inspect and Repair Wiring

• Sub-steps:

  1. Visually inspect the wiring harness connected to the transmission for frays, corrosion, or loose connections.
  2. Use a multimeter to check for continuity and proper voltage at the connectors.
  3. Repair or replace any damaged wiring or connectors as necessary.

• Tools Required:

  • Multimeter
  • Wire strippers/crimpers

4. Test and Replace Transmission Range Sensor

• Sub-steps:

  1. Locate the transmission range sensor (usually mounted on the side of the transmission).
  2. Disconnect the wiring harness from the sensor.
  3. Use a multimeter to test the sensor according to the manufacturer's specifications.
  4. If faulty, remove the sensor, and install a new one, ensuring it is properly aligned and secured.

• Tools Required:

  • Socket set
  • Multimeter

5. Reconnect Battery and Reset Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0700 code and any additional codes.
• Start the engine and allow it to reach operating temperature.