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

Solution

1. Preparation

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

2. Inspect and Replace Transmission Fluid

1. Remove the transmission dipstick and check fluid level and condition.
   • Tools Required: Transmission dipstick, clean rag.
2. If fluid is low or burnt, drain the old fluid.
   • Place a drain pan under the transmission pan.
   • Remove the transmission pan bolts and carefully lower the pan.
3. Replace the transmission filter if applicable.
   • Remove the old filter and install a new one using the manufacturer-specified part.
4. Reinstall the transmission pan with a new gasket.
   • Torque the bolts to manufacturer specifications (typically 8-12 ft-lbs).
5. Refill the transmission with new fluid as specified by the manufacturer (usually Honda ATF DW-1).

3. Inspect and Replace Transmission Control Module (if necessary)

1. Locate the TCM, which is typically found near the transmission or under the dash.
   • Tools Required: Socket set, screwdriver.
2. Disconnect the TCM connector by carefully releasing the locking mechanism.
3. If testing indicates a faulty TCM, remove the old module and install the new one.
4. Reconnect the wiring harness and ensure a secure fit.

4. Check Wiring and Connectors

1. Inspect all related wiring and connectors for damage.
   • Look for frayed wires or corrosion.
2. Repair or replace any damaged components as needed.

5. Clear Codes and Test Drive

1. Reconnect the negative battery terminal.
2. Use the OBD-II scanner to clear the P0700 code.
3. Perform a test drive to verify that the transmission operates normally and no new codes appear.