how to diagnose P0700 code on my Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather tools and parts before starting the repair.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Remove the transmission dipstick and check the fluid level.
  2. If low, add the recommended type of transmission fluid (typically Honda ATF-Z1 or DW-1).
  3. If fluid is dirty or smells burnt, proceed to drain and replace fluid.
  4. Remove the drain plug and allow the old fluid to completely drain.
  5. Replace the drain plug and refill with fresh fluid through the dipstick tube.

3. Inspect and Repair Wiring and Connectors

• Sub-steps:
  1. Visually inspect the wiring harness leading to the TCM for frays or breaks.
  2. Disconnect the TCM connector and inspect it for corrosion or bent pins.
  3. Clean the connector with electrical contact cleaner and reconnect it securely.
  4. Repair any damaged wiring using appropriate connectors or soldering.

4. Update or Replace Transmission Control Module (if necessary)

• Sub-steps:
  1. If diagnostics indicate a faulty TCM, obtain a replacement unit from a reputable supplier.
  2. Disconnect the battery again to prevent electrical issues.
  3. Remove the old TCM by unscrewing it from its mount and disconnecting the wiring harness.
  4. Install the new TCM, connect the wiring harness, and secure it in place.
  5. Reconnect the battery terminal.