What does the ABS light indicate as a fault?
2 Answers
ABS light indicates three possible faults: 1. Wheel speed sensor failure; 2. Poor contact in the connecting circuit; 3. Electronic control unit failure. ABS stands for Anti-lock Braking System, whose main function is to prevent wheel lock-up during emergency braking. If the front wheels lock up simultaneously, the car will continue in a straight line, losing steering control and the ability to avoid obstacles. If the rear wheels lock up simultaneously, the car may skid or spin dangerously under lateral forces. The ABS system mainly consists of wheel speed sensors, an electronic control unit, ABS modulator valves, an ABS warning light, and hydraulic control lines. Its primary function is to automatically regulate the braking force during braking, preventing wheel lock-up and maintaining a rolling-sliding state to ensure maximum traction between the wheels and the road surface.
As a seasoned driver with over a decade of experience, an illuminated ABS light typically indicates an issue with the anti-lock braking system. This warning light flashes yellow or red on the dashboard. There are several common causes, with the wheel speed sensor being the most prone to failure. Located near the wheel hub, these sensors collect rotation data and can trigger the light when dirty or damaged. Other possibilities include wiring damage or poor connections, such as short circuits caused by mud or water splashes, or a blown fuse—check the ABS-related one in the fuse box. More complex issues involve the ABS control module, which coordinates braking force and is costly to repair. When the light is on, ABS functionality usually fails, increasing braking distance and raising the risk of skidding, especially in wet conditions. It's advised not to delay: first, pull over to inspect tires and wiring, attempting a simple clean. If unresolved, promptly visit a repair shop for diagnostics—never ignore it. Regularly using a pressure washer to clean the wheel area during car washes can prevent dust buildup. Safety comes first; don't risk it to save a few bucks.
