how to check for P0700 transmission code in Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, transmission fluid dipstick, safety gloves, and eye protection.
• Ensure that the vehicle is parked on a level surface and the engine is turned off.

2. Clear Error Codes

• Connect the OBD-II scanner to the vehicle's diagnostic port.
• Follow the scanner instructions to clear the P0700 code.
• Disconnect the scanner after clearing the codes.

3. Inspect and Replace Transmission Fluid

• Remove the dipstick from the transmission fluid tube.
• Check the fluid level; add fluid if necessary.
• If the fluid is dark or has a burnt smell, drain the old fluid and replace it with the manufacturer-recommended transmission fluid.
  • Sub-steps:
    1. Raise the vehicle and secure it with jack stands.
    2. Remove the transmission pan bolts and drain the old fluid.
    3. Replace the transmission filter if applicable.
    4. Reinstall the transmission pan with a new gasket and torque bolts to the manufacturer specification.
    5. Fill the transmission with new fluid through the dipstick tube.

4. Repair Electrical Connections

• Inspect and clean the TCM connectors.
• Repair any damaged wires or replace connectors if necessary.
• Reconnect all electrical connections securely.

5. Recheck and Test the TCM

• Reconnect the OBD-II scanner and check for any remaining codes.
• If P0700 or related codes persist, replace the transmission control module following the manufacturer's procedure.
• Sub-steps:
  1. Disconnect the vehicle battery.
  2. Remove the TCM from its mounting bracket.
  3. Install the new TCM and secure it in place.
  4. Reconnect the battery and clear codes again.