how to fix P0700 transmission code on 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 negative battery terminal to prevent electrical shorts.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission dipstick (if equipped) and remove it.
  2. Check fluid level; add the appropriate type of transmission fluid if low (Toyota ATF WS).
  3. If the fluid is dark or smells burnt, drain the old fluid and replace it.
  4. Remove the transmission drain plug using a socket set and allow fluid to drain completely.
  5. Replace the drain plug and tighten to the manufacturer's torque specification (usually around 30 lb-ft).
  6. Refill with new transmission fluid through the dipstick tube using a funnel until it reaches the proper level.

3. Inspect and Repair Wiring/Connectors

• Sub-steps:
  1. Locate the TCM and its connectors.
  2. Disconnect the connectors and inspect for bent pins or corrosion.
  3. Clean any corrosion with electrical contact cleaner and a soft brush.
  4. Repair or replace damaged wiring as necessary.

4. Check and Replace TCM Fuse

• Sub-steps:
  1. Locate the fuse box and identify the fuse related to the TCM.
  2. Remove the fuse using fuse pullers.
  3. Inspect the fuse; replace it if blown.
  4. Reinsert the new fuse and ensure it is seated properly.

5. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the codes.
  3. Perform a test drive to ensure the transmission operates smoothly.