Volvo XC40 ABS Light Stays On: Wheel Speed Sensor & Other Causes

Understanding the ABS Warning Light on Your XC40

When the ABS light stays on continuously in your Volvo XC40, the anti-lock braking system has detected a fault and disabled itself. You still have normal braking, but you lose ABS, traction control, and stability assist. The most common trigger is a wheel speed sensor, but it's not the only possibility.

Likely Causes & What to Check First

• Wheel speed sensor: Dirt, metal debris, or a failed sensor can interrupt the signal. On the XC40, front sensors are often exposed to road grime.
• Wiring and connectors: Chafed wires near the wheel arch or corroded connectors are frequent culprits. Inspect for cuts or green corrosion.
• Tone ring (reluctor ring): A cracked or rusted ring on the axle can make the sensor read incorrectly.
• ABS module or pump: Less common, but internal electronics can fail, especially if water ingress occurs.
• Low battery voltage: A weak battery can cause multiple warning lights, including ABS. Check voltage first if other lights are also on.

Is It Safe to Keep Driving?

Yes, you can usually drive carefully to a shop, but avoid slippery roads and hard braking. Your brakes will still work, but without ABS, wheels can lock up in an emergency. If the red brake warning light is also on, or the ABS light flashes, stop driving and get it towed.

Don't ignore it: a wheel speed sensor fault can also affect your speedometer, cruise control, and hill start assist. A quick diagnostic scan will pinpoint the exact wheel and save you time and money.

This material is AI-generated and for informational purposes only — it does not replace an in-person diagnosis by a qualified mechanic.