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

Solution

1. Preparation

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

2. Inspect and Replace Transmission Fluid

1. Locate the transmission dipstick or fill plug.
2. Remove the dipstick or fill plug and check the fluid level; add fluid as needed.
3. If the fluid is dirty or smells burnt, drain the transmission fluid by removing the drain plug.
4. Replace the fluid with the manufacturer-recommended transmission fluid type (e.g., BMW ATF).
5. Replace the drain plug and torque it to the manufacturer’s specifications.

3. Replace Transmission Filter

1. Remove the transmission pan by loosening the bolts using a socket set.
2. Carefully lower the pan and remove the old filter.
3. Install a new filter, ensuring it locks in place properly.
4. Clean the pan and reinstall it using a new gasket or sealant.

4. Repair Wiring and Connectors (if necessary)

1. Inspect wiring harnesses for any signs of wear, fraying, or corrosion.
2. Repair or replace any damaged wiring or connectors using electrical tape or heat-shrink tubing.
3. Ensure all connections are secure.

5. Reconnect Battery and Clear Codes

1. Reconnect the battery terminals.
2. Use the OBD-II scanner to clear any stored codes.
3. Start the engine and allow it to reach operating temperature.