Posted on 3/28/2025
A malfunctioning speedometer isn’t just a minor annoyance—it can make driving more dangerous and put you at risk of speeding without realizing it. If your speed display suddenly freezes, jumps around, or drops to zero while you’re still in motion, something in your vehicle’s electrical or sensor system isn’t working as it should. From sensor failures to dashboard issues, there are a few common culprits behind inaccurate speed readings. Knowing what to watch for can help you get the problem fixed before it turns into a bigger safety concern. Why Do Speedometers Stop Working or Act Up In modern vehicles, speed data is collected by a vehicle speed sensor (VSS), usually located on the transmission. This sensor measures how fast the wheels are turning and sends that information to the car’s onboard computer, which then feeds it to the speedometer. If that sensor malfunctions, becomes dirty, or fails completely, the system may receive b ... read more