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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent electrical shorts while working on the vehicle.

2. Check Transmission Fluid

• Locate the transmission dipstick and remove it.
• Wipe it clean, reinsert, and then remove it again to check fluid level.
• If the fluid is low, add the manufacturer-recommended transmission fluid until it reaches the appropriate level. If the fluid is dark or burnt, a fluid change is recommended.

3. Inspect and Repair Wiring

• Remove the underbody cover if necessary to access the transmission wiring harness.
• Visually inspect the wiring for any fraying, cuts, or corrosion.
• Repair any damaged wires with appropriate connectors and heat shrink tubing.

4. Replace Transmission Control Module (if necessary)

• If diagnostics indicate the TCM is faulty, disconnect the battery again for safety.
• Remove the TCM from its mounting location, usually secured with bolts.
• Disconnect the wiring harness from the TCM.
• Install the new TCM by connecting the wiring harness, securing it with bolts, and re-mounting it in its original position.

5. Reconnect Battery and Clear Codes

• Reconnect the battery terminals securely.
• Use an OBD-II scanner to clear the P0700 code from the system.