how to fix P0700 transmission code in Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Transmission Fluid

• Tools Required: Torque wrench, funnel, fluid pump.
• Remove the transmission fluid drain plug and allow old fluid to drain into a pan.
• Replace the drain plug and torque it to the manufacturer's specified value (usually around 30-40 ft-lb).
• Using a funnel, add new transmission fluid (Honda ATF-Z1 or the recommended type) through the dipstick tube or fill port until it reaches the correct level.

3. Check and Repair Wiring/Connectors

• Tools Required: Multimeter, wire brush, electrical cleaner.
• Inspect all wiring and connectors leading to the TCM for signs of wear or damage.
• Use a multimeter to check for continuity in the wires.
• Clean any corrosion from connectors with electrical cleaner and a wire brush.
• Repair or replace any damaged wiring or connectors as necessary.

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

• Tools Required: OBD-II scanner, basic hand tools.
• Reconnect the battery and use an OBD-II scanner to check for any new codes.
• If the P0700 code persists and no other issues are found, remove the TCM.
• Replace it with a new or refurbished TCM, ensuring proper alignment and connection.
• Reconnect the battery and clear any error codes.