how to fix P0700 transmission fault code on Volkswagen Tiguan First Generation (2007-2018)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, fluid catch pan, funnel.
• Check the fluid level using the dipstick; if low, add the manufacturer-recommended fluid.
• If the fluid is dark or has a burnt smell, perform a fluid change:
  1. Place the vehicle on a level surface and lift it using jack stands.
  2. Remove the transmission pan bolts and carefully lower the pan.
  3. Drain the old fluid into the catch pan.
  4. Replace the transmission filter if applicable.
  5. Clean the pan and magnet, then reinstall the pan with a new gasket.
  6. Refill with the appropriate transmission fluid using the funnel.

3. Check and Repair Wiring and Connectors

• Tools Required: Multimeter, electrical contact cleaner.
• Inspect the wiring harness and connectors leading to the TCM:
  1. Look for frayed wires or corrosion.
  2. Use a multimeter to test for continuity in the wiring.
  3. Clean any corroded connectors with electrical contact cleaner and ensure tight connections.

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

• Tools Required: OBD-II scanner, TCM programming tool (if needed).
• If the TCM is suspected to be faulty:
  1. Remove the TCM from its mounting location.
  2. Install a new or refurbished TCM, ensuring all connectors are secure.
  3. Use the OBD-II scanner to clear any stored fault codes and test drive the vehicle to confirm proper function.