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

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 avoid electrical shorts.

2. Fluid Change

• Tools Required: Transmission fluid pump, socket set, torque wrench.
• Remove the transmission fluid drain plug using a socket, and drain the old fluid into a suitable container.
• Replace the drain plug and torque it to the manufacturer's specifications.
• Refill the transmission with the appropriate type and amount of fluid as specified in the owner's manual.

3. Inspect and Replace Wiring/Connectors

• Visually inspect the wiring harness connected to the TCM for any signs of wear or damage.
• If damaged, disconnect the wiring harness and replace it with a new one.
• Ensure that all connectors are securely attached and free of corrosion.

4. TCM Replacement (if necessary)

• Tools Required: Socket set, torque wrench.
• Locate the TCM, which is usually situated near the transmission.
• Disconnect the battery and remove the mounting bolts of the TCM.
• Carefully detach the TCM from its connector.
• Install the new TCM by reversing the removal steps and ensuring tight connections.
• Torque the bolts to manufacturer specifications.

5. Reconnect Battery and Test

• Reconnect the battery and clear the P0700 code using the OBD-II scanner.
• Start the vehicle and monitor for any transmission issues during a test drive.