my BMW 5 Series F10/F11 (2010-2017) has a check transmission light on, what should I do?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to ensure safety while working on electrical components.

2. Fluid Change

1. Drain the Old Fluid

   • Locate the transmission drain plug and place a drain pan underneath.
   • Remove the drain plug and allow the old fluid to fully drain.
   • Reinstall the drain plug and torque to manufacturer specifications.

2. Replace the Transmission Filter (if applicable)

   • Remove the transmission pan by unbolting it from the transmission casing.
   • Carefully detach the old filter and replace it with a new one.
   • Clean the transmission pan and replace the gasket if necessary.

3. Refill with New Fluid

   • Use the manufacturer-recommended transmission fluid type.
   • Fill the transmission with the new fluid through the fill tube until it reaches the correct level.

3. Electrical Inspection

1. Inspect Wiring and Connectors

   • Visually check the wiring harness for frays or breaks.
   • Clean and secure any loose connections.

2. Test the TCM

   • Use a multimeter to check the TCM for proper voltage and continuity.
   • Replace the TCM if it fails the testing.

4. Final Assembly

• Reinstall any components removed during the process.
• Reconnect the battery and ensure all connections are tight and secure.