how to fix P0700 transmission code on Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the vehicle to cool if the engine has been running.

2. Check and Replace Transmission Fluid

• Tools Required: Fluid pump, funnel, 10mm socket wrench

• Inspect the transmission fluid dipstick (if applicable) or check the fill plug.

  • If the fluid is low, add the recommended type of transmission fluid (check owner’s manual for specifications).
  • If the fluid is dirty or burnt, proceed to drain and replace it.

• To drain the fluid:

  • Place a drain pan under the transmission.
  • Remove the drain plug using the 10mm socket.
  • Allow the old fluid to completely drain out.

• Replace with new fluid:

  • Reinstall the drain plug and torque it to the manufacturer’s specification.
  • Use the fluid pump and funnel to fill the transmission with new fluid through the fill plug until it reaches the proper level.

3. Inspect and Repair Wiring and Connectors

• Tools Required: Multimeter, wire brush
• Inspect wiring harness and connectors leading to the TCM and transmission for wear, corrosion, or disconnection.
• If any wiring is damaged, repair or replace it as necessary.
• Clean connectors with a wire brush and apply dielectric grease to prevent future corrosion.

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

• Tools Required: OBD-II scanner, hand tools for TCM removal
• If no wiring issues are found, use the OBD-II scanner to verify TCM functionality.
• If the TCM is faulty, remove it by following the manufacturer’s guidelines:
  • Disconnect the electrical connectors.
  • Remove the mounting bolts.
  • Install the new TCM by reversing the removal steps and ensuring all connections are secure.