how to fix P0700 code in my 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 cool.
• Disconnect the battery to prevent electrical shorts.

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, funnel, socket set.
• Remove the transmission fluid dipstick (if equipped) and check the fluid level.
• If fluid is low, add the appropriate type of transmission fluid as specified in the owner's manual.
• If the fluid is dirty or burnt, proceed to drain and replace the fluid.
  • Sub-steps:
    1. Place a drain pan under the transmission pan.
    2. Remove the transmission pan bolts and carefully take off the pan.
    3. Drain the old fluid completely and inspect the pan for metal shavings or debris.
    4. Replace the transmission filter if applicable.
    5. Reinstall the pan with a new gasket and torque to manufacturer specifications.

3. Inspect and Repair Wiring/Connections

• Tools Required: Multimeter, wire brush, electrical cleaner.
• Inspect the wiring harness and connectors leading to the TCM.
  • Sub-steps:
    1. Clean any corroded connectors with electrical cleaner and a wire brush.
    2. Repair or replace any damaged wiring as needed.

4. Replace Transmission Control Module (if necessary)

• Tools Required: Socket set, torque wrench.
• If the TCM is found to be faulty during testing, replace it.
  • Sub-steps:
    1. Remove the old TCM by unscrewing the mounting bolts.
    2. Disconnect the electrical connectors.
    3. Install the new TCM by reversing the removal process and ensuring all connections are secure.
    4. Torque the mounting bolts to manufacturer specifications.