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

Solution

1. Preparation

• Gather Tools: OBD-II scanner, multimeter, socket set, torque wrench, fluid pump.
• Safety Precautions: Disconnect the battery before working on electrical systems. Allow the engine to cool before starting.

2. Address Fluid Issues

1. Check Fluid Level:

   • Remove the fill plug on the transmission.
   • Use a fluid pump to add fluid if necessary.
   • Ensure the fluid level is within the manufacturer's specified range.

2. Change Transmission Fluid and Filter:

   • Remove the transmission pan using a socket set.
   • Drain the old transmission fluid.
   • Replace the filter and clean the pan.
   • Reinstall the pan with a new gasket and torque to manufacturer specifications.

3. Repair or Replace Faulty Sensors

1. Inspect and Replace Sensors:
   • Identify faulty speed sensors based on diagnostics.
   • Disconnect the wiring harness from the sensor.
   • Remove the sensor from its location using appropriate tools.
   • Install the new sensor and reconnect the wiring harness.

4. Repair Wiring and Connectors

1. Fix Damaged Wiring:
   • Identify any damaged wires or connectors.
   • Repair or replace as necessary, ensuring proper insulation and connection.

5. Reprogram TCM (if necessary)

1. Reprogram TCM:
   • Connect the OBD-II scanner to the vehicle.
   • Follow the scanner instructions to reprogram the TCM if required.