how to fix P0700 transmission problem in Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a flat surface, and engage the parking brake.
• Disconnect the battery to prevent electrical shorts.

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, socket set, funnel.
• Drain the old transmission fluid by removing the drain plug. Allow the fluid to completely drain into a suitable container.
• Replace the transmission filter if applicable (remove the transmission pan if necessary).
• Refill with new transmission fluid as specified in the owner's manual (typically Honda ATF DW-1).

3. Inspect and Repair Wiring/Connectors

• Tools Required: Multimeter, wire brush, dielectric grease.
• Inspect wiring harness and connectors for signs of wear or damage.
• Clean any corrosion from connectors with a wire brush and apply dielectric grease to prevent future corrosion.
• Repair or replace damaged wiring as necessary.

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

• Tools Required: OBD-II scanner, socket set.
• If the TCM is suspected to be faulty, test it using an OBD-II scanner for specific codes.
• If confirmed faulty, remove the TCM by disconnecting the electrical connectors and unscrewing the mounting bolts.
• Install the new TCM, ensuring all connectors are securely attached.

5. Reconnect Battery and Perform Reset

• Reconnect the negative terminal of the battery.
• Clear the P0700 code using the OBD-II scanner.
• Start the vehicle and allow the TCM to learn the new settings through a short test drive.