my BMW 5 Series F10/F11 (2010-2017) has a harsh transmission shift, what can I do?

Solution

1. Preparation

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

2. Fluid Change

• Tools Required: Transmission fluid pump, socket set, torque wrench.
• Sub-steps:
  1. Remove the transmission pan bolts using a socket set.
  2. Carefully lower the pan and drain the old transmission fluid into a container.
  3. Inspect the transmission filter and replace it if necessary.
  4. Reinstall the transmission pan with a new gasket; torque bolts to manufacturer specifications (typically 10 Nm).
  5. Refill the transmission with the recommended fluid type (usually BMW ATF) through the dipstick tube.

3. TCM Reset and Reprogram

• Tools Required: OBD-II scanner with programming capabilities.
• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to reset the TCM.
  3. Follow the manufacturer's instructions to reprogram the TCM if necessary, ensuring all adaptive transmission settings are cleared and reset.

4. Check and Repair Electrical Connections

• Tools Required: Multimeter, electrical cleaner.
• Sub-steps:
  1. Inspect the wiring harness connected to the TCM for any signs of wear or damage.
  2. Clean any corroded connectors with electrical cleaner.
  3. Test the electrical connections for continuity using a multimeter.