how to diagnose and fix P0700 transmission code in Volkswagen Golf MK6 (2009-2014)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, torque wrench, transmission fluid pump.
• Disconnect the vehicle battery to ensure safety during electrical work.
• Allow the vehicle to cool down if the engine has been running.

2. Transmission Fluid Change

• Sub-steps:
  1. Locate the transmission drain plug and remove it with the appropriate socket.
  2. Drain the old transmission fluid completely into a suitable container.
  3. Replace the transmission filter (if applicable): Remove the transmission pan and filter, then install a new filter.
  4. Reinstall the transmission pan and torque the bolts to the manufacturer's specifications (typically around 8-10 Nm).
  5. Refill the transmission with the correct type and amount of fluid (usually VW G052162A2 for MK6, check the manual for specifics).

3. TCM Inspection

• Sub-steps:
  1. Remove the TCM from its mounting location (ensure all connectors are disconnected).
  2. Inspect the TCM for signs of physical damage or burnt components.
  3. If necessary, replace the TCM with a new or refurbished unit.
  4. Reconnect the TCM and ensure all connections are secure.

4. Range Sensor Replacement (If Faulty)

• Sub-steps:
  1. Locate the transmission range sensor, typically on the side of the transmission.
  2. Disconnect the electrical connector from the sensor.
  3. Remove the sensor from its mount and replace with a new one.
  4. Reconnect the electrical connector and ensure it clicks into place.

5. Final Check

• Sub-steps:
  1. Reconnect the vehicle battery.
  2. Start the engine and check for any warning lights on the dashboard.
  3. Perform a road test to confirm that the transmission operates smoothly without any error codes.