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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a level surface and supported with jack stands.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission fluid dipstick or fill plug.
  2. Remove the dipstick or fill plug and inspect the fluid; it should be a bright red color and not have a burnt smell.
  3. If the fluid is low or contaminated, drain the transmission fluid using a fluid pump or by removing the drain plug.
  4. Replace with the manufacturer-recommended transmission fluid (e.g., BMW ATF, fluid type: Dexron VI).
  5. Refill the transmission to the correct level using a funnel.

3. Inspect Wiring and Connectors

• Sub-steps:
  1. Locate the TCM connector on the transmission.
  2. Visually inspect the wiring for any signs of damage, fraying, or corrosion.
  3. Use a multimeter to check continuity between the TCM and the transmission solenoids.
  4. If any wiring issues are found, repair or replace the damaged sections.

4. Replace Transmission Control Module (if necessary)

• Sub-steps:
  1. Remove the TCM from its mounting location.
  2. Disconnect the electrical connectors from the TCM.
  3. Install the new TCM by connecting the electrical connectors and mounting it securely.
  4. Reconnect the negative battery terminal.