how to fix P0700 transmission control system malfunction BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is on a flat surface and parked securely.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Fluid Change

• Tools Required: Socket set, funnel, drain pan, new transmission fluid, new transmission filter (if applicable).
• Remove the transmission fluid pan using the socket set.
• Allow the old fluid to drain completely into the drain pan.
• Inspect the old fluid for metal shavings or debris, which could indicate internal issues.
• Replace the transmission filter (if applicable) by removing any securing clips or bolts.
• Reinstall the pan with a new gasket and torque to manufacturer's specifications.
• Refill the transmission with the appropriate type and amount of fluid using the funnel.

3. TCM Inspection and Repair

• Tools Required: Multimeter, wiring harness repair kit (if needed).
• Reconnect the battery and use the multimeter to check the voltage at the TCM connector.
• If voltage is not within specifications, trace the wiring back to the main harness for faults.
• Repair or replace any damaged wiring or connectors.
• If TCM is determined to be faulty, remove it from its mounting location and disconnect the wiring harness.
• Install the new or refurbished TCM, reconnect the harness, and secure it in place.

4. Clearing Codes and Testing

• Tools Required: OBD-II scanner.
• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0700 and any other diagnostic trouble codes.
• Start the vehicle and conduct a test drive to ensure proper shifting and operation of the transmission.