how to fix P0700 transmission control system code in Volkswagen Golf Seventh Generation (2013-2020)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, transmission fluid pump.
• Ensure the vehicle is on a flat surface and securely lifted if needed. Disconnect the battery negative terminal for safety.

2. Inspect and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission fluid dipstick or fill plug.
  2. Remove the dipstick or fill plug and check the fluid level.
  3. If low, pump new transmission fluid (specifically VW G 052 162 A2 or equivalent) into the transmission until it reaches the proper level.
  4. If the fluid is burnt or dirty, proceed to replace it.
  5. Drain the old fluid by removing the transmission drain plug (use a pan to catch fluid).
  6. Replace the drain plug and torque it to the manufacturer's specifications (typically 25 Nm).
  7. Refill with new transmission fluid through the dipstick or fill plug.

3. Inspect and Repair Wiring and Connectors

• Sub-steps:
  1. Visually inspect the wiring harness connected to the transmission for frays or breaks.
  2. Clean any corrosion from connectors using electrical contact cleaner.
  3. Repair or replace any damaged wiring or connectors.

4. Test and Replace Transmission Control Module (if necessary)

• Sub-steps:
  1. Check the TCM for proper voltage using a multimeter (consult specific voltage requirements from service manual).
  2. If voltage is insufficient, trace back to power sources and check fuses.
  3. If the TCM is confirmed faulty, disconnect the battery and remove it from the vehicle.
  4. Install the new TCM and reconnect all connectors.
  5. Reconnect the battery.

5. Test Transmission Solenoids

• Sub-steps:
  1. Remove the transmission pan to access the solenoids (ensure to drain the fluid first).
  2. Check the resistance of each solenoid using a multimeter (consult specific resistance values from the service manual).
  3. Replace any faulty solenoids as necessary.
  4. Reinstall the transmission pan with a new gasket and torque to the manufacturer's specifications.