how to fix rough shifting in Honda Civic 9th Generation (2012-2015) automatic transmission

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, fluid pump, funnel, and multimeter.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts while working on the transmission.

2. Fluid Change

1. Drain the Old Fluid

   • Locate the transmission drain plug, typically at the bottom of the transmission pan.
   • Using the socket set, remove the drain plug and let the fluid drain into a suitable container.
   • Replace the drain plug and torque it to the manufacturer’s specifications (usually around 30 ft-lbs).

2. Replace the Transmission Filter

   • Remove the transmission pan by unscrewing the bolts with the socket set.
   • Carefully lower the pan and remove the old filter from the transmission.
   • Install the new filter, ensuring it is seated properly.

3. Clean the Pan and Gasket Surface

   • Clean the transmission pan and the gasket surface on the transmission using a lint-free cloth to remove any debris or old gasket material.
   • Apply a thin layer of RTV silicone or use a new gasket as per manufacturer specifications.

4. Reattach the Pan

   • Reinstall the transmission pan and secure it with screws. Torque to manufacturer specifications, typically around 10-12 ft-lbs.

5. Refill Transmission Fluid

   • Using a fluid pump and funnel, refill the transmission with the recommended type of fluid (usually Honda ATF-Z1 or DW-1) until it reaches the correct level on the dipstick.

3. Electrical Component Check

1. Inspect TCM and Wiring

   • Visually inspect the TCM and wiring harness for any signs of damage or corrosion.
   • Use a multimeter to check for continuity and proper voltage at the TCM connectors.

2. Reprogram TCM (if applicable)

   • If the TCM is functioning but still causing issues, consider reprogramming it using an OBD-II scanner that supports TCM programming.