how to fix U0401 code in Volkswagen Golf Seventh Generation (2013-2020)

Learn how to diagnose and fix U0401 invalid data received issue in Volkswagen Golf 7. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the vehicle's battery to avoid electrical shorts.
• Safety goggles and gloves should be worn during the procedure.

2. Inspect Wiring and Connectors

• Tools Required: Socket set, multimeter, torque wrench.
• Inspect the wiring harness connected to the Vehicle Dynamics Control Module.
  • Look for frayed wires, broken connections, or signs of wear.
  • Ensure all connectors are seated properly and free from corrosion.
• If any damaged wiring is found, repair or replace the affected sections.

3. Test Vehicle Dynamics Control Module

• Tools Required: Multimeter.
• Check the power and ground at the Vehicle Dynamics Control Module's connector.
  • Measure voltage with the multimeter; it should read within specified ranges (typically around 12V for power).
  • Check for continuity in ground wires.
• If the module is not receiving power, trace the wiring back to the fuse box and repair any faults.

4. Replace Vehicle Dynamics Control Module (if necessary)

• Tools Required: Socket set, torque wrench, OBD-II scanner.
• If the module is confirmed faulty, remove it from its mounting.
  • Disconnect all connectors and unscrew the module from its bracket.
  • Install the new module by reversing the removal steps.
  • Torque bolts to the manufacturer’s specifications (refer to repair manual).

5. Reconnect Battery and Clear Codes

• Reconnect the battery terminals securely.
• Use the OBD-II scanner to clear any existing codes.
• Conduct a test drive to ensure the issue is resolved.