how to fix P0700 transmission code in Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a level surface, and the engine is cool.
• Disconnect the negative battery terminal.

2. Check Transmission Fluid

• Tools Required: Transmission fluid dipstick, funnel, new transmission fluid.
• Remove the transmission fluid dipstick and wipe it clean.
• Reinsert the dipstick and remove it again to check the fluid level.
• If low, add the appropriate type of transmission fluid as specified in the owner's manual.

3. Inspect Wiring and Connectors

• Tools Required: Multimeter, screwdriver.
• Inspect the wiring harness leading to the TCM for any signs of fraying, corrosion, or disconnection.
• Use the multimeter to check for continuity in the wiring.
• Repair or replace damaged wiring or connectors as needed.

4. Replace or Reflash TCM

• Tools Required: OBD-II scanner, TCM replacement (if necessary).
• If the TCM is faulty, replace it with a new unit compatible with the Honda Civic 10th Generation.
• If the TCM is functional, use an OBD-II scanner to reflash or update the TCM software as recommended by Honda.

5. Clear Codes and Test Drive

• Tools Required: OBD-II scanner.
• After repairs, reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the P0700 code.
• Test drive the vehicle to check for proper transmission operation and ensure the check engine light does not reappear.