how to fix rough shifting in my Honda Civic 9th Generation (2012-2015) when cold

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and engage the parking brake.
• Disconnect the battery (negative terminal) for safety.

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, socket set, torque wrench, fluid catch pan.
• Remove the transmission fluid drain plug and allow the fluid to drain completely into the catch pan.
• Inspect the old fluid for debris or a burnt smell; if contaminated, proceed to replacement.
• Reinstall the drain plug and torque to manufacturer specifications.
• Use the fluid pump to add the recommended transmission fluid through the fill port until the proper level is achieved.
• Safety Warning: Ensure to use the correct type of transmission fluid as specified in the owner’s manual.

3. Inspect and Replace Transmission Filter (if applicable)

• Tools Required: Socket set, screwdrivers, gasket scraper.
• Remove the transmission pan using the socket set, being cautious of fluid spillage.
• Inspect and replace the transmission filter; ensure it is seated correctly.
• Clean the pan and the mating surfaces, then install a new gasket.
• Reinstall the transmission pan and torque to manufacturer specifications.

4. Check and Adjust Transmission Control Module (TCM)

• Tools Required: OBD-II scanner, laptop or device for software updates.
• If any fault codes related to TCM are present, perform necessary reprogramming or updates as directed by manufacturer guidelines.

5. Test Drive

• Reconnect the battery and start the vehicle.
• Test drive to ensure that the rough shifting issue has been resolved.