how to fix the P0700 transmission code in my Toyota Corolla E210 (2019-2024)?

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. Inspect and Replace Transmission Fluid

• Sub-steps:
  1. Remove the transmission dipstick (if applicable) and check the fluid level.
  2. If fluid is low, add the recommended type (Toyota WS) fluid.
  3. If fluid is dark or has a burnt smell, consider a fluid change.
  4. Drain the old fluid using a drain pan, and replace with new fluid.
  5. Recheck fluid level after driving the vehicle briefly.

3. Check and Repair Wiring

• Sub-steps:
  1. Visually inspect the wiring harness connected to the TCM for frays or breaks.
  2. Use a multimeter to check for continuity in the wiring.
  3. Repair any damaged wires with appropriate connectors or electrical tape.
  4. Ensure all connectors are secure and free of corrosion.

4. Test or Replace Transmission Control Module

• Sub-steps:
  1. Locate the TCM, typically mounted on or near the transmission.
  2. Disconnect the TCM from the wiring harness.
  3. Test the TCM with a multimeter for proper voltage input and output.
  4. If the TCM is faulty, replace it with a new unit, ensuring to program it if required.
  5. Reconnect the TCM and secure it in place.