What Causes the ABS Light to Illuminate and the Speedometer to Stop Working?

[VonLilliana]

When the ABS light is on and the speedometer is not functioning, it is necessary to inspect the speedometer flexible core, which is the connecting device between the transmission and the speedometer. The issue might be due to a broken core in the middle. The continuous noise from the ABS pump is caused by an internal control short circuit in the ABS pump. Below are the specific details about the ABS system: 1. Function of the ABS System: ABS stands for Anti-lock Braking System, which is part of the vehicle's active safety system. When the ABS light is on, it indicates that the vehicle's computer has detected a fault in the ABS system. 2. Principle of the ABS Light: Under normal driving conditions, the ABS remains dormant. It only activates during emergency braking, such as high-speed hard braking, when the vehicle's computer determines that ABS intervention is necessary. The ABS light usually illuminates when the wheel speed sensors fail to operate correctly. The ABS computer cannot detect the driving conditions of each wheel or compare the slippage of each wheel, resulting in the ABS system's inability to function properly.

[Allie]

My car has been running for over a decade, and I've encountered the ABS light coming on along with a non-functional speedometer quite a few times. Generally speaking, the issue lies with the vehicle speed sensor, which is mounted on the wheel and responsible for sending signals to the ABS system and the dashboard. If the sensor gets dirty, broken, or stuck, the ABS light will illuminate, and the speedometer will stop working as well. Loose wiring connections, blown fuses, or a faulty ABS control module can also cause this problem. When the vehicle speed sensor shares resources, a single failure can lead to dual malfunctions, making it difficult to see the speed while driving and potentially rendering the braking system unreliable. If the speedometer suddenly stops working on the highway, it's easy to speed or lose control. I recommend getting the vehicle speed sensor and wiring checked as soon as possible to avoid compromising driving safety.

[DiIsla]

Last time I was driving, the ABS light came on and the speedometer stopped working, which really had me worried. I asked a mechanic friend, and he said it's mostly an issue with the wheel speed sensor—this part is located near the wheel, and when it fails, it affects the brake signals and speed display. Worn-out wiring or poor connections are also common culprits. I tried checking the wiring connections myself to see if they were loose, and sure enough, I found a loose connector. After tightening it, everything went back to normal. An illuminated ABS light indicates a problem with the braking safety system, and a non-functional speedometer is even more dangerous since you can't tell how fast you're going. During routine maintenance, pay attention to keeping the sensors clean to avoid mud and dirt buildup. If this happens at a critical moment, don't take risks—take your car to a repair shop for a proper fix.

[FinleyRose]

As a car enthusiast, I believe that when the ABS light comes on and the speedometer stops working, the root cause is often a faulty vehicle speed sensor. The ABS system relies on sensors to monitor wheel speed for anti-lock braking, while the dashboard depends on the same sensor to display speed. Once the sensor fails or the wiring shorts out, the ABS light immediately warns you, and the speedometer gets stuck. This not only hinders normal driving by making it difficult to judge speed but also increases the risk of brake failure. An ECU malfunction can also trigger this dual problem. Simple checks like inspecting wire connections and fuses can help, but a complete fix usually requires replacing the sensor. Ignoring the issue can lead to accidents, especially when driving at night, so it's best to address it promptly.