how to fix my BMW 3 Series F30/F31 (2012-2019) transmission slipping when shifting

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a level surface and secure it with wheel chocks.
• Disconnect the battery to avoid electrical shorts during the repair.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission dipstick and remove it.
  2. If the fluid is low, add the recommended transmission fluid (consult owner's manual for specifications).
  3. If the fluid is dark or burnt, drain the old fluid by removing the drain plug.
  4. Replace the old fluid with new, following the manufacturer's recommendations.
• Tools Required:
  • Funnel for fluid transfer
  • Drain pan
  • Socket set for drain plug removal

3. Replace Transmission Filter

• Sub-steps:
  1. Remove the transmission pan by unscrewing the bolts (may require a torque wrench).
  2. Carefully lower the pan and allow any remaining fluid to drain.
  3. Remove the old transmission filter and replace it with a new one.
  4. Clean the pan and replace the gasket to prevent leaks during reinstallation.
  5. Reinstall the transmission pan and torque the bolts to the manufacturer’s specifications.
• Tools Required:
  • Socket set
  • Torque wrench
  • Gasket scraper

4. Reconnect Battery and Test Drive

• Sub-steps:
  1. Reconnect the vehicle's battery.
  2. Start the engine and let it idle.
  3. Shift through all gears to ensure smooth operation.
  4. Take the vehicle for a test drive to confirm that the slipping issue has been resolved.
• Safety Warnings:
  • Ensure the vehicle is in park or neutral before reconnecting the battery.