why is my Volvo XC90 ABS light on and traction control disabled

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety while working on the ABS system.

2. Inspect ABS Wheel Speed Sensors

• Locate the wheel speed sensors near each wheel hub.
• Clean any debris or dirt from the sensors using a soft cloth.
• Check the wiring for any signs of wear or damage.
• If damaged, remove the sensor by unscrewing it from the hub and replace it with a new one. Torque to manufacturer specifications (typically around 10 Nm).

3. Check ABS Control Module

• Remove any covers obstructing access to the ABS control module.
• Inspect wiring and connectors for damage or corrosion.
• If necessary, clean connectors with electrical contact cleaner and reassemble.
• If the module is faulty, replace it according to the manufacturer's guidelines, ensuring proper alignment and torque specifications.

4. Brake Fluid Level Check

• Locate the brake fluid reservoir under the hood.
• Ensure the fluid is at the recommended level; if low, top off with the appropriate type of brake fluid (DOT 4 or as specified in the owner's manual).
• Inspect for any leaks in the brake lines or around the master cylinder.

5. Reconnect Battery and Clear Codes

• Reconnect the vehicle battery.
• Use the OBD-II scanner to clear any stored error codes.
• Perform a system reset if necessary according to the scanner instructions.