how to fix the P0700 transmission code on Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety during repairs.
• Ensure the vehicle is on a level surface and secure it with wheel chocks.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission dipstick or fill port.
  2. Remove the dipstick/fill plug and check fluid level; add the correct type of transmission fluid if low.
  3. If the fluid appears dirty or burnt, drain the transmission fluid using a drain pan.
  4. Replace the old fluid with fresh fluid of the manufacturer’s specified type.
  5. Reinsert the dipstick or fill plug and ensure it is secure.

3. Inspect and Repair Wiring/Connectors

• Sub-steps:
  1. Visually inspect the wiring harness connected to the TCM for frays or breaks.
  2. Disconnect the connectors and clean them with electrical contact cleaner.
  3. Repair any damaged wires with heat-shrink tubing or electrical tape.
  4. Reconnect all connectors securely.

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

• Sub-steps:
  1. Using a multimeter, check the power and ground circuits to the TCM for proper voltage.
  2. If the TCM is faulty, remove it by unscrewing the mounting bolts.
  3. Disconnect the wiring harness from the TCM.
  4. Install the new TCM by connecting the harness and securing it with screws.
  5. Reconnect the battery and clear the codes with the OBD-II scanner.