Why the ABS light is on: what the dashboard warning means

Every driver has seen a yellow or orange ABS icon light up on the dashboard when starting the engine at least once. Normally it goes out after a few seconds, but if the indicator stays on while driving, that’s a serious reason to run diagnostics. And to make a car more comfortable and personalized, many drivers also look at tuning accessories, which are now available in a wide range in our online store.

Main reasons the indicator activates

The ABS system consists of an electronic control unit, a hydraulic unit, and wheel sensors. A failure of any of these components leads to a fault:

• Wheel sensor malfunction. This is the most common cause. The sensors are located close to the wheels, so they often suffer from dirt, moisture, road salt/chemicals, or mechanical damage.
• Wiring issues. Oxidized contacts or broken wires connecting the sensors to the control unit will trigger the warning light immediately.
• Magnetic ring wear. If the special ring on the hub bearing is damaged or dirty—the one the sensor reads—the system won’t be able to correctly determine wheel speed.
• Voltage problems. If the battery is low, the alternator output is unstable, or there’s a wiring break/poor contact, the control unit may shut down.
• Low brake fluid level. In some cars, a critical drop in level can affect ABS operation.
• Control unit failure. This happens less often, but it’s the most expensive repair option.

What to do if the light comes on?

It’s important to understand: if the ABS indicator is on, the standard braking system still works, but during hard braking the wheels may lock up because the anti-lock function isn’t active.

To identify the cause, you can take a few simple steps:

• Check the brake fluid level in the reservoir;
• Inspect the fuses responsible for the ABS system;
• Check the condition of the sensors and the toothed or magnetic rings on the wheels;
• If needed, clean the sensors from dirt with a dry cloth or brush;
• Visit a service center to read the fault code using a diagnostic scanner.

Responding promptly to a warning on the dashboard helps avoid dangerous situations on the road and keeps the vehicle in proper working condition.