how to fix P0700 code in BMW 5 Series G30/G31 (2017-2024)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is off before starting work.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Change Transmission Fluid

• Tools Required: Socket set, fluid pump, transmission fluid (BMW-approved), drain pan.
• Remove the transmission fluid drain plug and let the old fluid drain completely into the drain pan.
• Replace the drain plug with a new gasket and torque to manufacturer specifications (typically around 25 Nm).
• Using a fluid pump, refill the transmission with new BMW-approved fluid through the fill port until it reaches the proper level.
• Start the engine and cycle through the gears to ensure fluid circulates, then check fluid level again and top off if necessary.

3. Repair or Replace Transmission Control Module (if necessary)

• Tools Required: Socket set, torque wrench, TCM (if replacement is needed).
• Locate the TCM, typically found near the transmission or under the dashboard.
• Disconnect the wiring harness from the TCM.
• Remove the TCM mounting bolts and carefully pull the module out.
• If replacing, install the new TCM by reversing the removal steps and ensuring all connectors are secure.
• Reconnect the battery.

4. Reset Transmission Adaptations

• Tools Required: OBD-II scanner.
• Use the scanner to clear the P0700 code and reset the transmission adaptations.
• Follow the on-screen instructions to complete the reset process.