how to fix P0700 transmission fault code in Toyota Corolla E210 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery negative terminal.
• Lift the vehicle securely if accessing the undercarriage.

2. Check and Replace Transmission Fluid

• Tools Required: Fluid pump, funnel, torque wrench.
• Check the transmission fluid level using the dipstick; if low, fill it with the manufacturer-recommended fluid.
• If the fluid is dark or has a burnt smell, drain the old fluid and replace it with new fluid.
• Sub-steps:
  • Remove the drain plug, allow fluid to drain completely, and replace the drain plug.
  • Use a fluid pump to fill the transmission with new fluid through the fill port.
  • Torque the fill plug to the manufacturer’s specification.

3. Inspect and Repair Wiring/Connectors

• Tools Required: Multimeter, wire stripper, electrical connectors.
• Inspect the wiring harness and connectors to the TCM for damage or corrosion.
• Sub-steps:
  • Use a multimeter to test for continuity in the wiring from the TCM to the transmission.
  • Repair or replace any damaged wiring or connectors as needed.

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

• Tools Required: OBD-II scanner, basic hand tools.
• If the TCM is determined to be faulty, it will need to be replaced.
• Sub-steps:
  • Disconnect the battery.
  • Remove the TCM by unscrewing it from its mount and disconnecting the wiring harness.
  • Install the new TCM by reversing the removal steps, ensuring all connectors are secure.
  • Reconnect the battery.