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

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Multimeter
• Transmission fluid

2. Inspect and Replace Transmission Fluid

• 1.1. Remove the transmission drain plug and drain the old fluid into a suitable container.
• 1.2. Inspect the old fluid for metal shavings or burnt odor.
• 1.3. Replace the transmission filter if applicable.
• 1.4. Reinstall the drain plug and torque it to the manufacturer's specifications.
• 1.5. Refill the transmission with new fluid using a funnel, ensuring it meets BMW specifications.

3. Inspect Wiring and Connectors

• 2.1. Locate the transmission control module (TCM) and disconnect the wiring harness.
• 2.2. Inspect the connectors for corrosion or bent pins.
• 2.3. Use a multimeter to test for continuity and proper voltage at the TCM pins.
• 2.4. Repair or replace any damaged wiring or connectors.

4. Update Transmission Software

• 3.1. Connect the OBD-II scanner and check for available software updates for the TCM.
• 3.2. Follow the scanner prompts to update the software if required.
• 3.3. Clear the P0700 code after updating.

5. Reconnect Battery and Test

• 4.1. Reconnect the battery terminals ensuring they are tight.
• 4.2. Start the engine and let it idle for a few minutes.
• 4.3. Perform a test drive to ensure proper shifting and that the P0700 code does not return.