how to fix my BMW 5 Series G30/G31 (2017-2024) that jerks when shifting gears?

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is off.
• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shock.

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, funnel, socket set.
• Sub-steps:
  1. Locate the transmission fluid dipstick or fill port.
  2. Remove the dipstick and check fluid level; if low, add fluid using the pump and funnel.
  3. If fluid is contaminated, drain the old fluid completely using a socket set to remove the drain plug.
  4. Replace with the manufacturer-recommended transmission fluid type (e.g., BMW ATF).
  5. Reinstall the drain plug and check for leaks.

3. Update Transmission Control Module (TCM) Software

• Tools Required: BMW diagnostic tool (e.g., ISTA/D).
• Sub-steps:
  1. Connect the BMW diagnostic tool to the OBD-II port.
  2. Access the TCM software section.
  3. Check for any available software updates and follow the prompts to install updates.
  4. Clear any stored error codes after updating.

4. Inspect and Replace Transmission Solenoids

• Tools Required: Socket set, multimeter, torque wrench.
• Sub-steps:
  1. Remove any necessary components to access the transmission solenoids.
  2. Disconnect the electrical connectors from the solenoids.
  3. Use a multimeter to test the resistance of each solenoid; replace any that are out of spec.
  4. Install new solenoids and torque to manufacturer specifications.