how to fix the P0700 code in 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 shorts.

2. Check and Replace Transmission Fluid

1. Locate the transmission dipstick (if equipped) or the fill plug.
2. Remove the dipstick or fill plug and check fluid level.
3. If low, add the manufacturer-recommended transmission fluid (Toyota WS).
4. If fluid is dark or burnt, proceed to drain and replace the fluid.
   • Tools Required: Socket set, transmission fluid pump, drain pan.
   • Safety Warnings: Ensure engine is cool before performing fluid checks.

3. Inspect and Repair Electrical Connections

1. Visually inspect the wiring harness connected to the TCM and transmission solenoids.
2. Clean any corrosion or dirt from connectors using electrical contact cleaner.
3. If damage is found, repair or replace the affected wiring and connectors.

4. Test and Replace Transmission Solenoids (if necessary)

1. Remove the transmission pan to access the solenoids.
   • Tools Required: Socket set, torque wrench, gasket scraper.
2. Disconnect the electrical connectors from the solenoids.
3. Test each solenoid using a multimeter for resistance as per manufacturer specifications.
4. Replace any faulty solenoids and reinstall the transmission pan with a new gasket.
   • Torque bolts to manufacturer specifications.

5. Reconnect Battery and Clear Codes

1. Reconnect the battery.
2. Use the OBD-II scanner to clear any stored codes.
3. Start the engine and allow it to reach operating temperature.