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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle's battery to ensure safety while working on electrical systems.

2. Inspect and Clean Wheel Speed Sensors

• Locate the ABS wheel speed sensors on each wheel.
• Remove the sensor connectors and inspect for corrosion or damage.
• Clean the sensor and the mounting area with a brake cleaner.
• Reconnect the sensors securely.

3. Check and Replace Brake Fluid

• If the brake fluid is low, top it off with the manufacturer-recommended brake fluid (typically DOT 4 for Volvo vehicles).
• If the fluid appears contaminated, perform a brake fluid flush.

4. Check ABS Control Module and Wiring

• Inspect the ABS control module for any visible damage or corrosion.
• Using a multimeter, test the voltage and ground connections to the module.
• Repair or replace any damaged wiring as necessary.

5. Test and Replace ABS Pump (if necessary)

• Reconnect the battery and test the ABS pump operation by activating the ABS system through a diagnostic scanner.
• If the pump fails to activate, it may need to be replaced. Remove the old pump and install the new ABS pump following manufacturer specifications.