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

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission dipstick and remove it.
  2. Check fluid level; add fluid if low, or drain and replace if dirty.
  3. Use Honda ATF DW-1 or equivalent fluid as specified in the owner's manual.
• Tools Required:
  • Transmission fluid pump
  • Fluid catch pan

3. Inspect and Repair Wiring and Connectors

• Sub-steps:
  1. Visually inspect the wiring harness connected to the TCM and transmission solenoids.
  2. Repair any damaged wires or replace corroded connectors.
  3. Ensure all connections are tight and secure.
• Tools Required:
  • Wire strippers
  • Electrical tape
  • Multimeter

4. Replace Transmission Control Module (if necessary)

• Sub-steps:
  1. Remove any panels obstructing access to the TCM.
  2. Disconnect the TCM wiring harness.
  3. Unbolt the TCM from its mounting bracket and remove it.
  4. Install the new TCM and reconnect the wiring harness.
  5. Reinstall any panels removed during the process.
• Tools Required:
  • Socket set
  • Torque wrench (use manufacturer torque specs)

5. Test the Transmission Solenoids

• Sub-steps:
  1. Remove the transmission pan to access solenoids.
  2. Disconnect the solenoid connectors and test resistance with a multimeter.
  3. Replace any solenoids that are out of specification.
  4. Reinstall the transmission pan with a new gasket.
• Tools Required:
  • Socket set
  • Torque wrench
  • Multimeter