how to address 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's negative terminal to prevent electrical shock.

2. Inspect and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission dipstick and remove it.
  2. Check the fluid level; if low, add the manufacturer-recommended transmission fluid (Toyota ATF WS).
  3. If fluid is dark or burnt, proceed to drain and replace the fluid.
  4. Use a socket set to remove the transmission pan bolts and carefully lower the pan.
  5. Replace the transmission filter if applicable.
  6. Reinstall the pan with a new gasket and torque bolts to the manufacturer’s specifications (usually around 10-12 ft-lbs).
  7. Refill the transmission with the recommended fluid.

3. Inspect and Repair Electrical Connections

• Sub-steps:
  1. Locate the wiring harness connected to the transmission.
  2. Visually inspect for frayed wires or loose connections.
  3. Clean any corrosion from connectors using electrical contact cleaner.
  4. Repair or replace damaged wiring as necessary.

4. Test and Replace Transmission Control Module (if necessary)

• Sub-steps:
  1. Reconnect the battery and use the OBD-II scanner to check for persistent codes.
  2. If the P0700 code remains, remove the TCM from its mounting location.
  3. Replace the TCM with a new unit, ensuring proper alignment and connection.
  4. Reconnect the battery and clear any codes using the OBD-II scanner.