how to fix P0700 code on BMW 3 Series E90/E91 (2005-2012)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, torque wrench, transmission fluid pump.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a level surface and securely lifted.

2. Transmission Fluid Service

1. Drain the Transmission Fluid
   • Locate the transmission drain plug and remove it using the appropriate socket.
   • Allow the fluid to completely drain into a suitable container.
2. Replace the Transmission Filter
   • Remove the transmission pan by loosening the bolts with a socket set.
   • Carefully detach the pan and replace the old filter with a new one, ensuring that the sealing surface is clean.
3. Install the Transmission Pan
   • Place a new gasket on the pan and torque the bolts to the manufacturer’s specifications (typically around 8-10 Nm).
   • Reinstall the drain plug and torque it to the manufacturer’s specifications.

3. Clear Codes and Test Drive

1. Clear the P0700 Code
   • Use the OBD-II scanner to clear the trouble codes from the vehicle’s computer.
2. Refill Transmission Fluid
   • Using a transmission fluid pump, refill the transmission with the appropriate fluid type (typically BMW ATF or equivalent).
   • Check the fluid level with the dipstick and ensure it is at the correct level.
3. Test Drive the Vehicle
   • Conduct a test drive to verify that the transmission shifts smoothly and the P0700 code does not reappear.