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

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, multimeter, transmission fluid, funnel, and safety gloves.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to prevent electrical shocks.

2. Check Transmission Fluid

• Locate the transmission dipstick or fill plug.
• Remove the dipstick and wipe it clean.
• Reinsert the dipstick and remove it again to check the fluid level.
• If fluid is low, add the manufacturer-recommended transmission fluid until the level is correct.
• If fluid is dark or has a burnt smell, consider a transmission fluid change.

3. Inspect Wiring and Connectors

• Visually inspect the wiring harness leading to the TCM and transmission for damage, fraying, or corrosion.
• Disconnect the TCM connectors and inspect the pins for corrosion or bent pins.
• Repair or replace any damaged wiring or connectors as necessary.

4. Test Transmission Control Module

• Using a multimeter, check the voltage at the TCM connectors while the ignition is in the "ON" position.
• Ensure the TCM is receiving power and ground as per the specifications outlined in the manufacturer’s service manual.
• If the TCM is not receiving proper voltage, trace the issue back to the fuse or wiring.

5. Clear Codes and Test Drive

• After repairs are completed, reconnect the battery and use the OBD-II scanner to clear the P0700 code.
• Start the vehicle and perform a test drive to verify that the transmission operates smoothly and that the check engine light does not reappear.