What Causes the Volvo ABS Light to Illuminate?

[DeclanRose]

Volvo ABS light may illuminate due to the following reasons: Reason 1: The ABS wheel speed sensor's sensing area is covered by mud, sludge, or other contaminants, affecting the sensor's ability to detect the corresponding vehicle speed signal. This prevents the ABS computer from determining the vehicle speed and the wheel slip rate, thus unable to issue appropriate commands to adjust braking. Solution: Clean the dirt off the wheel speed sensor and adjust the gap between the sensor and the signal ring to restore normal function. Reason 2: Poor signal quality caused by loose connections between system wires or poor contact of the ABS relay can lead to system failure. The most common issue is a loose connection of the wheel speed sensor wire, which will also display as a wheel speed sensor signal malfunction in the ABS computer's fault memory. Solution: Inspect the wire connections and reconnect any loose parts.