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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, transmission fluid pump, fluid catch pan.
• Ensure the vehicle is on a level surface and the engine is turned off. Allow the transmission to cool if it has been operating.

2. Check Fluid Level and Condition

• Remove the transmission dipstick (if equipped) or access the fill plug.
• Use a clean cloth to check fluid condition; it should be bright red and free of debris or burnt smell.
• If low, add the recommended transmission fluid (refer to owner's manual for specific type).

3. Inspect Transmission Connections

• Visually inspect the wiring harness connected to the TCM and transmission.
• Use a multimeter to test for continuity and check for shorts or opens in the wiring.
• Repair or replace any damaged wiring or connectors.

4. Test and Replace TCM (if needed)

• If the TCM is determined to be faulty, follow these steps:
  • Disconnect the negative battery terminal.
  • Remove the mounting bolts and disconnect the wiring harness from the TCM.
  • Install the new TCM and reconnect the wiring harness.
  • Reconnect the battery terminal.

5. Reset Transmission Adaptations

• Use an OBD-II scanner to reset the transmission adaptations.
• Follow the scanner’s instructions to complete the reset process.

6. Final Checks

• Recheck the transmission fluid level and top up as necessary.
• Start the engine and allow it to warm up, then shift through all gears to ensure proper operation.