what happens if I ignore the P0700 code on my BMW 5 Series G30/G31 (2017-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, socket set, fluid catch pan.
• Inspect the fluid level with the dipstick; if low, add the appropriate transmission fluid as specified in the owner’s manual.
• If fluid is dirty or burnt, drain the old fluid completely and replace it with new fluid.
  • Sub-steps:
    1. Place a fluid catch pan under the transmission pan.
    2. Remove the pan bolts using the socket set.
    3. Carefully lower the pan and allow old fluid to drain.
    4. Replace the transmission filter if applicable.
    5. Reattach the pan and torque bolts to manufacturer specifications.
    6. Refill the transmission with new fluid through the dipstick tube.

3. Inspect and Repair Wiring and Connectors

• Tools Required: Multimeter, wire strippers, electrical tape.
• Carefully inspect wiring harnesses and connectors related to the transmission for damage or corrosion.
  • Sub-steps:
    1. Locate the TCM connectors and inspect for any bent pins or corrosion.
    2. Test continuity of wiring using the multimeter.
    3. Repair any damaged wires or replace connectors as necessary.

4. Replace or Reprogram TCM

• Tools Required: OBD-II scanner with programming capability.
• If the TCM is faulty, it may need to be replaced or reprogrammed.
  • Sub-steps:
    1. Disconnect the battery before removing the TCM.
    2. Remove the old TCM and install the new unit.
    3. Reconnect the battery and use the OBD-II scanner to program the new TCM.
    4. Clear any fault codes and verify proper function.