how to fix P0700 transmission code on my BMW 3 Series F30/F31 (2012-2019)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.
• Raise the vehicle securely on jack stands.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Remove the transmission fluid fill plug.
  2. If the fluid level is low, top it off with the manufacturer-recommended transmission fluid (usually BMW ATF).
  3. If the fluid appears dark or has a burnt smell, drain the old fluid.
  4. Replace with fresh transmission fluid and check for leaks.

3. Inspect and Replace Transmission Control Module (TCM)

• Sub-steps:
  1. Locate the TCM, usually found near the transmission housing.
  2. Disconnect the wiring harness from the TCM.
  3. Remove the TCM from its mounting bracket.
  4. Install the new TCM, ensuring it is securely mounted.
  5. Reconnect the wiring harness.

4. Check and Replace Transmission Solenoids

• Sub-steps:
  1. Remove the transmission pan to access the solenoids.
  2. Disconnect the electrical connectors from the solenoids.
  3. Remove the solenoids from their mounting positions.
  4. Install new solenoids and reattach the electrical connections.
  5. Reinstall the transmission pan using a new gasket.

5. Reconnect Battery and Reset Codes

• Sub-steps:
  1. Reconnect the battery terminals.
  2. Use the OBD-II scanner to clear any fault codes from the system.
  3. Start the vehicle and allow it to reach operating temperature.