how to troubleshoot P0700 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.
• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, fluid catch pan.

2. Transmission Fluid Inspection

• Remove the transmission dipstick to check fluid level. If low, add the appropriate type of ATF (e.g., Toyota WS fluid).
• Inspect the fluid condition. If it appears dark or has a burnt smell, it may need to be replaced.
• If the fluid is contaminated, proceed to flush the transmission.

3. Electrical System Check

• Disconnect the battery terminal to ensure safety.
• Inspect the wiring harness and connectors for the TCM and transmission solenoids. Repair or replace any damaged components.
• Reconnect the battery and use a multimeter to check the voltage at the TCM. Ensure it receives the proper voltage (typically around 12V with the ignition on).

4. TCM Testing

• Using an OBD-II scanner, check for any specific codes related to solenoid malfunctions or communication failures.
• If a specific solenoid is indicated, replace it according to manufacturer specifications, ensuring to torque to the recommended values.

5. Reassemble and Test

• After repairs, reassemble any components you removed. Ensure all connectors are secure.
• Clear the P0700 code using the OBD-II scanner.
• Start the engine and conduct a road test to verify that the transmission operates smoothly and the check engine light does not illuminate.