how do I fix the P0700 transmission trouble code in my BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

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

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, funnel, socket set, torque wrench.
• Sub-steps:
  1. Remove the transmission fluid drain plug and drain the old fluid into a suitable container.
  2. Replace the drain plug and torque it to the manufacturer’s specifications (typically around 25 Nm).
  3. Use a transmission fluid pump to fill the transmission with the correct type of BMW transmission fluid (consult the owner’s manual for specifications).
  4. Start the engine and allow it to reach operating temperature.
  5. Shift through all gears to circulate the fluid, then check the fluid level again and top off if necessary.

3. Inspect and Repair Wiring

• Tools Required: Multimeter, wire strippers, soldering iron, heat shrink tubing.
• Sub-steps:
  1. Visually inspect the wiring harness connected to the TCM for any signs of wear or damage.
  2. Use a multimeter to check for continuity and proper voltage in the wiring.
  3. Repair any damaged wires by cutting out the damaged section and soldering in a new piece of wire.
  4. Insulate repaired sections with heat shrink tubing.

4. Replace the Transmission Control Module (if necessary)

• Tools Required: Socket set, torque wrench.
• Sub-steps:
  1. Disconnect the battery again for safety.
  2. Locate the TCM (usually near the transmission or under the dashboard).
  3. Disconnect the electrical connectors from the TCM.
  4. Remove the TCM by unscrewing the mounting bolts and carefully pulling it out.
  5. Install the new TCM by reversing the removal steps and ensuring all connections are secure.
  6. Reconnect the battery.