how to diagnose P0700 code in BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.
• Ensure the vehicle is on a flat surface and secure it with wheel chocks.

2. Inspect Transmission Fluid

• Tools Required: Fluid level dipstick, funnel, transmission fluid.
• Remove the dipstick and check the fluid level; add fluid if low.
• If the fluid is dark or smells burnt, prepare to replace it.

3. Repair Wiring and Connectors

• Tools Required: Wire cutters, electrical connectors, heat shrink tubing, multimeter.
• Inspect the wiring harness for any signs of wear or damage.
• Repair any damaged wires and ensure all connectors are secure and free of corrosion.

4. Replace Transmission Fluid (if necessary)

• Tools Required: Socket set, drain pan, new transmission fluid, funnel.
• Place a drain pan under the transmission, remove the drain plug, and allow fluid to drain completely.
• Replace the drain plug and refill the transmission with new fluid using the funnel, ensuring the correct type and quantity as specified in the owner’s manual.

5. Test Transmission Control Module

• Tools Required: Multimeter or specialized TCM diagnostic tool.
• Reconnect the battery, turn the ignition on (do not start the engine), and check voltage to the TCM.
• If voltage is low or absent, further investigate the power supply to the TCM.