how to fix my BMW 3 Series F30/F31 (2012-2019) that won’t shift out of park?

Solution

1. Preparation

• Gather tools and materials: OBD-II scanner, multimeter, socket set, screwdrivers, replacement brake light switch (if needed).
• Ensure the vehicle is on a level surface and the parking brake is engaged.

2. Inspect and Test the Brake Light Switch

• Locate the brake light switch, typically mounted near the brake pedal.
• Sub-steps:
  • Disconnect the wiring harness from the brake light switch.
  • Use a multimeter to test the switch for continuity. If there is no continuity when the pedal is pressed, the switch is faulty.
  • If needed, replace the brake light switch by removing it from its mounting and installing the new switch. Ensure to reconnect the wiring harness.

3. Check and Repair Gear Selector Mechanism

• Remove the center console cover to access the gear selector.
• Sub-steps:
  • Inspect the interlock mechanism for any blockage or malfunction.
  • If damaged, replace the gear selector assembly by disconnecting the wiring harness and securing bolts.
  • Reinstall the center console cover and ensure the gear selector operates smoothly.

4. Refill Transmission Fluid (if necessary)

• If the fluid level is low, locate the transmission fill plug.
• Sub-steps:
  • Remove the fill plug and check the fluid level; add the appropriate transmission fluid if necessary (refer to the owner’s manual for specifications).
  • Reinstall the fill plug securely.