Volkswagen Passat B8 (2015-2022) ABS light on, how to fix this problem?

Solution

1. Preparation

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

2. Retrieve and Clear Fault Codes

• Connect an OBD-II scanner to the vehicle's diagnostic port.
• Retrieve and note any fault codes related to the ABS system.
• Clear the fault codes from the system and check if the ABS light returns upon starting the vehicle.

3. Inspect and Clean Wheel Speed Sensors

• Locate the wheel speed sensors at each wheel hub.
• Remove any dirt or debris from the sensors and the area around them.
• If damaged, replace the sensors with new ones.
• Reconnect any disconnected wiring to the sensors.

4. Check Brake Fluid Level

• Inspect the brake fluid reservoir.
• If the fluid is low, top it off with the manufacturer-recommended brake fluid (DOT 4).
• Inspect for any leaks in the brake lines or around the master cylinder.

5. Inspect ABS Module and Pump

• Check the ABS module for any visible signs of damage or corrosion.
• Inspect the pump for leaks or unusual noises during operation.
• If the module is faulty, replace it with a new unit, ensuring proper coding as per manufacturer specifications.

6. Reconnect Battery and Test Drive

• Reconnect the negative battery terminal.
• Start the vehicle and check if the ABS light remains off.
• Perform a test drive to ensure the ABS system is functioning correctly.