my BMW 3 Series F30/F31 (2012-2019) won't go into gear, what could be wrong?

Solution

1. Preparation

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

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, fluid catch pan, funnel.
• Remove the transmission fluid drain plug using a socket set and allow the old fluid to drain completely into the catch pan.
• Inspect the old fluid for metal shavings or burnt smell.
• Replace with the manufacturer's recommended transmission fluid type, using the fluid pump and funnel to fill.
• Reinstall the drain plug and torque to the manufacturer's specifications (typically around 25 Nm).

3. Inspect and Repair Transmission Linkage

• Tools Required: Socket set, screwdrivers.
• Visually inspect the transmission linkage for any bent or broken components.
• If damaged, replace the linkage parts with OEM components.
• Ensure all connections are secure and properly aligned.

4. Address Clutch Issues (if applicable)

• Tools Required: Hydraulic fluid, wrench set.
• If applicable, bleed the clutch system to remove any air bubbles:
  • Locate the bleed valve on the slave cylinder.
  • Attach a clear hose to the valve and immerse the other end in a container with hydraulic fluid.
  • Open the valve, pump the clutch pedal several times, and close the valve to prevent air from entering.
• Check for signs of wear on the clutch disc and pressure plate; replace if necessary.

5. Reconnect Battery and Test Drive

• Reconnect the negative battery terminal.
• Start the engine and allow it to idle for a few minutes.
• Test drive the vehicle to ensure the transmission shifts smoothly through all gears.