What is the fault when the ABS light is on in a truck?

[SanMiles]

The reasons for the ABS warning light being on in a truck are as follows: Reason 1: The sensing part of the ABS wheel speed sensor 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 failing 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 due to loose connections between system lines or poor contact of the ABS relay can cause system failure. The most common issue is a loose connection in the wheel speed sensor wiring, which will also show up in the ABS computer's fault memory as a poor wheel speed sensor signal. Solution: Check the wiring connections and reconnect any loose parts.