how do I fix the P0700 code on my Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Disconnect the battery to prevent electrical shorts.

2. Address Transmission Fluid Issues

• Fluid Check and Replacement:
  1. Locate the transmission dipstick (if applicable) and remove it.
  2. Check the fluid level; if low, add the correct type of ATF (Toyota ATF WS).
  3. If fluid is dark or smells burnt, drain the transmission fluid using a drain pan.
  4. Replace the fluid with fresh Toyota ATF WS and check the level again.

3. Inspect and Repair Wiring

• Wiring Inspection:
  1. Locate the wiring harness connected to the transmission control module.
  2. Visually inspect for any wear, fraying, or corrosion.
  3. Use a multimeter to check continuity in the wires.
  4. Repair or replace any damaged wiring or connectors.

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

• TCM Testing and Replacement:
  1. Reconnect the battery and use the OBD-II scanner to clear the P0700 code.
  2. If the code reappears, carefully remove the TCM from its mounting location.
  3. Replace the TCM with a new or refurbished unit, ensuring it matches the part number.
  4. Reinstall the TCM and reconnect all wiring and connectors.