how to fix my Volkswagen Passat B8 (2015-2022) that won’t start at all

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety during the repair process.

2. Battery Inspection and Replacement

• Inspect Battery:
  • Remove the battery terminals (negative first, then positive).
  • Clean any corrosion from terminals and connectors.
• Replace Battery (if necessary):
  • If the battery voltage is low or it fails a load test, replace it with a new battery of the same specifications (e.g., Group size and CCA rating).
  • Reconnect the positive terminal first, then the negative.

3. Starter Motor Testing and Replacement

• Test Starter Motor:
  • If the starter does not engage, remove it from the vehicle.
  • Bench test the starter motor by connecting it directly to a fully charged battery (positive to the terminal and negative to the housing).
• Replace Starter Motor (if faulty):
  • If the starter motor does not operate, replace it with a new one.
  • Reinstall the starter and connect all electrical connections securely.

4. Ignition Switch and Wiring Check

• Inspect Ignition Switch:
  • Remove the steering column cover to access the ignition switch.
  • Check the ignition switch for functionality using a multimeter.
• Replace Ignition Switch (if needed):
  • If the ignition switch shows no continuity when turned, replace it.
  • Reconnect all wiring and secure the steering column cover.