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

Solution

1. Preparation

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

2. Transmission Fluid Check and Replacement

• Tools Required: Fluid pump, 17mm socket, transmission fluid, funnel.
• Sub-steps:
  1. Remove the transmission fluid drain plug using a 17mm socket.
  2. Allow the fluid to drain completely into a suitable container.
  3. Inspect the fluid for metal shavings or burnt smell; replace if necessary.
  4. Using a fluid pump, fill the transmission with the correct type of BMW-approved fluid until it starts to overflow from the fill hole.
  5. Reinstall the drain plug and torque it to manufacturer specifications.

3. Inspect and Repair Wiring/Connectors

• Tools Required: Multimeter, wire stripper/crimping tool.
• Sub-steps:
  1. Locate the transmission control module and inspect the wiring harness for frays or damage.
  2. Using a multimeter, check for continuity and proper voltage at the TCM connector.
  3. Repair or replace any damaged wires or connectors as needed.

4. Replace Transmission Solenoids (if necessary)

• Tools Required: Socket set, torque wrench, new transmission solenoids.
• Sub-steps:
  1. Remove the transmission pan by unbolting it with a socket set.
  2. Carefully detach the solenoids from their mounting positions.
  3. Install new solenoids and ensure they are secured properly.
  4. Reinstall the transmission pan and torque bolts to specifications.

5. Reconnect Battery and Test

• Reconnect the battery terminals.
• Clear the P0700 code using the OBD-II scanner.
• Perform a road test to verify proper transmission operation.