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

Solution

1. Preparation

• Gather tools and parts required.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Secure the vehicle on a level surface and lift it with jack stands if necessary.

2. Check Transmission Fluid

• Tools Required: Transmission fluid dipstick (if equipped), funnel, fluid catch pan.
• Remove the transmission dipstick and check fluid level.
• If low, add manufacturer-recommended transmission fluid until it reaches the proper level.
• Inspect fluid condition; if burnt or contaminated, proceed to fluid replacement.

3. Replace Transmission Fluid and Filter

• Tools Required: Socket set, wrench set, transmission fluid pump.
• Drain the transmission fluid using the drain plug or by removing the pan.
• Safety Warning: Allow the transmission to cool before draining fluid to prevent burns.
• Remove the transmission pan bolts and carefully detach the pan.
• Remove the old transmission filter and install a new one, ensuring it is seated properly.
• Clean the transmission pan and apply new gasket material if required.
• Reinstall the transmission pan and torque bolts to manufacturer specifications (typically 8-10 Nm).

4. Inspect Wiring and Connectors

• Visually inspect the wiring harness connected to the TCM and the transmission solenoids.
• Look for signs of wear, fraying, or corrosion.
• If damaged, repair or replace the wiring as necessary.

5. Clear Codes and Test Drive

• Reconnect the battery terminal.
• Use the OBD-II scanner to clear the P0700 code and any additional codes found.
• Perform a test drive to check for proper shifting and to confirm that the issue has been resolved.