my Honda Accord 9th Generation (2013-2017) has a check engine light with code P0700

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical short circuits.

2. Fluid Inspection and Change

• Check Fluid Level:
  • Remove the transmission dipstick and wipe it clean.
  • Reinsert, then remove again to check fluid level; add fluid if low.
• Change Fluid (if necessary):
  • Place a drain pan under the transmission pan.
  • Remove the transmission pan bolts using a socket set.
  • Carefully lower the pan and drain the old fluid.
  • Replace the filter if applicable and clean the pan.
  • Reinstall the pan with a new gasket and torque bolts to manufacturer specifications (typically 8-12 ft-lbs).

3. Wiring and Connections

• Inspect the transmission wiring harness:
  • Look for frayed wires or loose connectors.
  • Repair or replace any damaged wiring.
• Ensure all connectors are seated properly.

4. TCM Inspection

• Remove the TCM for inspection:
  • Locate the TCM, disconnect the wiring harness, and remove mounting bolts.
  • Inspect for signs of damage or corrosion.
  • If necessary, replace the TCM with a new or refurbished unit.

5. Reconnect and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0700 code and any related codes retrieved during diagnostics.
• Start the vehicle and check for any reoccurring issues.