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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to prevent any electrical issues during repair.

2. Fluid Check and Replacement

• Tools Required: Transmission fluid pump, funnel, fluid catch pan.
• Inspect the transmission fluid dipstick (if equipped) or remove the transmission pan to check fluid level.
• If the fluid is low:
  1. Add the manufacturer-recommended transmission fluid (Honda ATF DW-1).
  2. If the fluid is dirty or burnt, proceed to drain and replace.
• Sub-steps:
  1. Drain the old fluid completely using a fluid catch pan.
  2. Replace the transmission filter if applicable.
  3. Refill with new fluid using a funnel until it reaches the proper level.

3. Inspect and Repair Wiring

• Tools Required: Wire brush, electrical contact cleaner, multimeter.
• Visually inspect the wiring harness connected to the TCM.
• Clean any corroded connectors using electrical contact cleaner and a wire brush.
• Repair or replace any damaged wires or connectors identified during the inspection.

4. TCM Testing and Replacement

• Tools Required: OBD-II scanner, multimeter.
• Reconnect the battery and use the OBD-II scanner to clear any existing codes.
• Test the TCM with a multimeter to ensure it is receiving and sending the correct signals.
• If the TCM is faulty:
  1. Remove the TCM from its mounting location.
  2. Install a new TCM, ensuring all connections are secure.
  3. Reconnect the battery and clear codes again.