how to fix P0700 code in Toyota Highlander XU70 (2020-Present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Inspect and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission dipstick and remove it.
  2. Check the fluid level and condition; if low or burnt, proceed to drain and replace.
  3. Use a socket set to remove the transmission pan bolts.
  4. Carefully lower the transmission pan and drain the old fluid into a suitable container.
  5. Clean the pan and replace the filter if applicable.
  6. Reinstall the pan with a new gasket and torque to manufacturer specifications.

3. Repair or Replace Wiring/Connectors

• Sub-steps:
  1. Visually inspect all wiring and connectors associated with the TCM for frays or corrosion.
  2. If damaged, repair wiring by soldering or replacing affected sections.
  3. If connectors are corroded, clean them with electrical contact cleaner or replace them.

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

• Sub-steps:
  1. If the TCM fails the function test with the multimeter, prepare to replace it.
  2. Disconnect the battery again for safety.
  3. Remove the TCM from its mounting location by unscrewing it and disconnecting the wiring harness.
  4. Install the new TCM, ensuring all connections are secure.
  5. Reconnect the battery.