how to fix P0700 transmission code in BMW 3 Series F30/F31 (2012-2019)?

Solution

1. Preparation

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

2. Transmission Fluid Change

1. Drain Old Fluid

   • Locate the transmission drain plug and remove it using a socket wrench.
   • Allow the fluid to completely drain into a suitable container.

2. Replace Transmission Filter

   • Remove the transmission pan by unscrewing the bolts with a socket set.
   • Carefully detach the pan and replace the old filter with a new one.
   • Clean the pan and the magnet inside to remove any metal shavings.

3. Refill New Fluid

   • Replace the transmission pan and tighten the bolts to the manufacturer’s torque specifications (typically around 10-12 Nm).
   • Use a funnel to refill the transmission with the correct type of fluid specified by the manufacturer (usually ATF).
   • Check fluid level using the dipstick and ensure it is at the appropriate level.

3. Repair or Replace Faulty Components

1. Inspect and Repair Wiring

   • Check the wiring harness for the TCM for any signs of wear or damage.
   • Repair or replace any damaged wires or connectors.

2. Replace TCM (if necessary)

   • If the TCM is confirmed faulty through diagnostics, remove it from the vehicle.
   • Install the new TCM, ensuring all connections are secure.
   • Reconnect the battery.

4. Software Update

• Use a BMW diagnostic tool to check for software updates for the transmission control module.
• Follow the manufacturer's instructions to update the software if applicable.