my Honda Civic 11th Generation (2022-Present) has a check engine light and P0700 code

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle battery to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission dipstick and remove it to check fluid level.
  2. If low, drain the old transmission fluid using the drain plug at the bottom of the transmission pan.
  3. Replace the old fluid with the manufacturer-recommended transmission fluid (consult owner’s manual for specifications).
  4. Refill the transmission fluid through the dipstick tube until the correct level is reached.

3. Check and Repair Wiring and Connectors

• Sub-steps:
  1. Inspect the transmission wiring harness for any frayed wires or signs of wear.
  2. Disconnect the connectors at the TCM and inspect for corrosion or bent pins.
  3. Repair or replace any damaged wiring or connectors as necessary.

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

• Sub-steps:
  1. Using a multimeter, check the voltage and ground signals at the TCM to ensure proper operation.
  2. If the TCM is faulty, disconnect it and remove it from its mounting.
  3. Install the new TCM, ensuring all connections are secure and correct.
  4. Reconnect the battery and clear any stored trouble codes.