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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, torque wrench
• Verify that the vehicle is on a level surface and secure it with wheel chocks.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Check Transmission Fluid

• Sub-steps:
  1. Locate the transmission dipstick (if applicable) or access the fill plug.
  2. Remove the dipstick or fill plug and check the fluid level.
  3. Inspect the fluid color and smell; it should be a clear red and free from burnt odors.
  4. If low, add the manufacturer-recommended transmission fluid until the correct level is reached.

3. Inspect Wiring and Connectors

• Sub-steps:
  1. Locate the TCM, which is typically found near the transmission or under the dashboard.
  2. Visually inspect the wiring harness and connectors for damage.
  3. Use a multimeter to check continuity and resistance in the wiring.
  4. Repair or replace any damaged wires or connectors as necessary.

4. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0700 code and any other transmission-related codes.
  3. Start the vehicle and conduct a test drive to monitor transmission behavior.

5. Further Diagnosis (if P0700 persists)

• Sub-steps:
  1. If the code returns, check for specific TCM-related codes to identify further issues (e.g., P0715, P0720).
  2. If necessary, consider replacing the TCM or consult a professional for advanced diagnostics.