how to fix the CAN bus communication error in Volkswagen Tiguan First Generation (2007-2018)

Solution

1. Preparation

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

2. Inspect and Repair Wiring

• Tools Required: Wire cutter/stripper, multimeter, electrical tape, heat shrink tubing.
• Inspect the wiring harness for damage.
  • If any damaged wires are found, cut the damaged section out and strip the ends.
  • Use heat shrink tubing to insulate repaired wires.
• Re-route any wires that are pinched or rubbing against sharp edges.

3. Examine and Clean Connectors

• Tools Required: Contact cleaner, small brush.
• Remove connectors related to the CAN bus system.
  • Clean connectors using contact cleaner and a brush to ensure good electrical contact.
  • Reassemble connectors securely after cleaning.

4. Check and Replace Termination Resistors

• Tools Required: Soldering iron, solder, multimeter.
• Locate the termination resistors at the end of the CAN bus.
  • Use a multimeter to check the resistance values (typically 120 ohms).
  • If faulty, desolder the old resistors and replace them with new ones.

5. Reconnect Battery and Conduct a System Test

• Reconnect the negative battery terminal.
• Start the vehicle and use the OBD-II scanner to check for any remaining error codes.
• Clear any error codes if no issues are found.