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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a level surface and securely lifted (if needed).

2. Inspect and Replace Fluid

• Step 1: Remove the transmission fluid pan.
  • Tools: Socket set, drain pan
• Step 2: Drain old fluid and inspect for metallic debris or particles.
• Step 3: Replace with new transmission fluid recommended by Toyota (typically WS fluid).
  • Fluid Type: Toyota Genuine ATF WS
  • Quantity: Refer to owner’s manual for exact amount.
• Step 4: Reinstall the fluid pan with a new gasket and torque bolts to manufacturer specifications (typically 8.5 ft-lbs).

3. Examine and Repair Wiring/Connectors

• Step 1: Locate the TCM and inspect wiring harnesses for damage or corrosion.
• Step 2: Clean any corroded connectors using electrical contact cleaner.
• Step 3: Repair or replace any damaged wires and secure loose connections.

4. Test Transmission Control Module

• Step 1: Reconnect the battery terminal.
• Step 2: Use a multimeter to test voltage at the TCM pins according to the wiring diagram provided in the service manual.
• Step 3: If the TCM fails the test, replace it with a new or refurbished module.

5. Clear Codes and Road Test

• Step 1: Use the OBD-II scanner to clear the P0700 code and any related codes.
• Step 2: Perform a road test to ensure proper operation of the transmission.