how to fix P0700 transmission trouble code in Toyota Highlander Fourth Generation (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 Transmission Fluid

• Tools Required: Transmission fluid dipstick, funnel, clean rags.
• Check the transmission fluid level using the dipstick. If low, add the appropriate fluid as specified in the owner’s manual.
• If the fluid is dirty or burnt, drain and replace it.

3. Repair or Replace Wiring and Connectors

• Tools Required: Wire stripper/crimper, electrical tape, multimeter.
• Inspect and repair any damaged wiring or connectors leading to the TCM.
• Use a multimeter to check for continuity and proper voltage at the TCM connectors. Repair any issues found.

4. Replace Transmission Range Sensor (if faulty)

• Tools Required: Socket set, torque wrench, screwdriver.
• Locate the transmission range sensor on the transmission.
• Disconnect the electrical connector and remove the mounting bolts.
• Install the new sensor and torque the bolts to the manufacturer’s specifications.
• Reconnect the electrical connector.

5. Reinstall TCM (if applicable)

• Tools Required: Socket set, torque wrench.
• If the TCM was removed for inspection or replacement, reinstall it following the manufacturer’s torque specifications.
• Reconnect all associated wiring and connectors.

6. Finalize

• Reconnect the battery.
• Clear the trouble codes using an OBD-II scanner.