how to troubleshoot the traction control light on my Volkswagen Passat B8 (2015-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to prevent any electrical shorts.

2. Scan for Error Codes

• Connect the OBD-II scanner to the vehicle's diagnostic port.
• Turn on the ignition without starting the engine.
• Read any stored error codes and note them for reference.

3. Inspect Wheel Speed Sensors

• Locate the wheel speed sensors on each wheel hub.
• Check for any visible damage or disconnections.
• Clean the sensor area with a soft cloth if dirt or debris is present.
• If damaged, replace the affected wheel speed sensor.

4. Check ABS Control Module

• Locate the ABS control module (usually near the brake master cylinder).
• Ensure all electrical connectors are secure and free from corrosion.
• Test the module with a multimeter to confirm proper voltage output as per the service manual specifications.

5. Evaluate Brake Fluid Level

• Open the hood and locate the brake fluid reservoir.
• Check fluid level; it should be between the "MIN" and "MAX" marks.
• If low, top up with the manufacturer-recommended brake fluid.
• If the fluid appears dirty, consider a brake fluid flush.

6. Verify Tire Condition and Pressure

• Check tire pressure using a tire gauge; ensure all tires are inflated to the manufacturer's specifications.
• Inspect tires for uneven wear, damage, or mismatched sizes.
• Replace any damaged or unsuitable tires.

7. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear any error codes.
• Turn the ignition on and check if the traction control light remains off.