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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to prevent electrical shock.
• Raise the vehicle using a jack and secure it with jack stands.

2. Transmission Fluid Change

• Tools Required: Socket set, fluid pump, torque wrench.
• Drain the old transmission fluid using a fluid pump into a suitable container.
• Replace the transmission fluid filter if applicable.
• Refill the transmission with manufacturer-recommended transmission fluid using a fluid pump.

3. Inspect and Repair TCM Connections

• Tools Required: Multimeter, wire brush, electrical contact cleaner.
• Disconnect the TCM connector and inspect for corrosion; clean with a wire brush and electrical contact cleaner.
• Reconnect the TCM and ensure a secure fit.

4. Replacing the TCM (if necessary)

• Tools Required: Socket set, torque wrench.
• Disconnect the battery again.
• Remove the TCM from its mounting location (typically secured with bolts).
• Install the new TCM and torque the bolts to the manufacturer's specifications.
• Reconnect the battery.

5. Reset Transmission Adaptations

• Use an OBD-II scanner to reset the transmission adaptations.
• Follow the manufacturer's specific procedure for resetting the TCM.